[Ordnance Maintenance]
[From the U.S. Government Publishing Office, www.gpo.gov]
TM 9-1235
Document Reserve
WAR DEPARTMENT
TECHNICAL MANUAL
ORDNANCE MAINTENANCE
37-MM ANTIAIRCRAFT GUN
MATERIEL
July 6, 1942
NON-CIRCULATING
NiSU LIBRARY
*TM 9-1235
1—2
TECHNICAL MANUAL No. 9-1235
WAR DEPARTMENT, Washington, July 6, 1942.
ORDNANCE MAINTENANCE
37-MM ANTIAIRCRAFT GUN MATERIEL
Paragraphs
Section I. General________________________________________ 1-4
II. Inspection____________________________________ 5-25
III. Maintenance and repair________________________26-51
Page
Appendix____________________________________________________ 98
Index_______________________________________________________ 99
Section I
GENERAL
Paragraph
Scope______________________________________________________________ 1
Characteristics____________________________________________________ 2
Carriage data______________________________________________________ 3
Gun data___________________________________________________________ 4
1. Scope.—a. This manual is published for the information and guidance of the using arms and services.
b. In addition to a description of the 37-mm antiaircraft materiel, this manual contains technical information required for the identification, use, and care of the materiel.
c. Disassembly, assembly, and such repairs as may be handled by using arms personnel will be undertaken only under the supervision of an officer or the chief mechanic.
d. In all cases where the nature of the repair, modification, or adjustment is beyond the scope or facilities of the unit, the responsible ordnance service should be informed in order that trained personnel with suitable tools and equipment may be provided, or proper instructions issued.
2. Characteristics.—The 37-mm antiaircraft gun is a full automatic weapon. The gun is mounted on a four-wheeled trailer carriage capable of being towed 50 mph on good roads. By means of counterpoise cylinders the chassis is lowered to the ground for firing and raised to the wheels for traveling. Antitank firing as well as antiaircraft firing is possible.
* This pamphlet supersedes TM 9-1235, November 27, 1940.
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TM 9-1235
3 ORDNANCE MAINTENANCE
3. Carriage data.
Item M3 M3E1 M3A1
Guns One 37-mm AA One 37-mm AA One 37-mm AA au-
automatic gun automatic gun tomatic gun
I M1A2. M1A2 and two .50 cal. Browning machine guns M2, water-cooled, flexible. M1A2.
Carriage chassis _ 4-wheeled towed vehicle type. Same as M3 Same as M3.
Brakes Disk and lever type electric brakes on 4 wheels. Hand brakes on rear wheels. Same as M3 carriage. Same as M3.
Leveling mech- Tilts through a Same as M3 car- Tilts through a
anism. range of 10°. Operated by two handwheels. riage. range of 10°. Operated by 2 ratchet wrenches secured to the leveling mechanism.
Elevating mech- Two speed ratios available for 0-85° One speed ratio.
anism. limit elevation. Hand operated only. Hand and power
One turn of handwheel elevates 3.75° operated. Me-
in slow ratio and 11.25° in fast ratio. chanical stops at -5° and 90°. Automatic stop switch for power operation at 0 and 85°. One turn of handwheel elevates 4.67°.
Traversing Two speed ratios available for 360° One speed ratio.
mechanism. traverse. Hand operated only. Hand and power
One turn of hand wheel traverses operated for 360°
3.75° in slow ratio and 11.25° in fast ratio. traverse. One turn of han dwheel traverses 6°.
Equilibrator Equilibrator connected to cradle by means of a rod. Same as M3 Equilibrator connected to cradle by means of a rod and a chain.
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TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 3
Item M3 M3E1 M3A1
Firing mechanism. Outrigger assembly. Cradle Cam and lever arrangement operated by a foot pedal. Pivots about a bracket centrally located on each side of the chassis. Stands upright for traveling. Open frame construction. Sighting system M2 and telescopes M7. 5,300. Same as M3 carriage for the 37-mm gun. Separate pedal for cal. .50 machine guns. Removed from bracket and carried alongside the chassis for traveling. Open frame construction. Contains brackets for attachment of two cal. .50 machine guns. Sighting system M2 and telescopes M7. 5,600 _ _ Lever and cable arrangement operated by two foot pedals. Adjustment provided for semiautomatic or automatic firing. Same as M3 or M3E1 carriage. Frame construction
On-carriage fire-control equipment. Weight, complete, pounds. Rate of fire, rounds per minute. Over-all length (traveling position) inches. Over-all width with top, bottom, and front removable cov- ers. Remote control system Ml and direct fire sights. 6,100. 120.
120 120 for 37-mm
241 gun; 650 for cal. .50 machine gun. 241. 241.
69.5_ 69.5 69.5.
(traveling position) inches. Tread, inches Wheelbase, inches. Height (traveling position), inches. Height of trunnions above ground, inches. 58_ ______ 58 _ 58.
120 120 120.
80.5 80.5_ __ 72.
33 33 ___ __ _ 54.5.
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TM 9-1235
3-4
ORDNANCE MAINTENANCE
Item M3 M3E1 M3A1
Road clearance, inches. 11 11 11.
Tire size 5.50-18 5.50-18 5.50-18.
Tire inflation, pounds per square inch. 38 38 38.
4. Gun data.—a. Gun, 37-mm, M1A2.
Weight of gun, complete____________________pounds. _
Length of gun, complete____________________inches. _
Weight of tube___________________________pounds__
Length of tube_____________________________inches __
Length of bore_____________________________calibers __
Life of tube_______________________________rounds. _
Muzzle velocity___________________feet per second. _
Rate of fire___________________rounds per minute. _
Type of breechblock_______________________________
Recoil mechanism__________________________________
Length of recoil___________________________inches __
Recoil fluid______________________________________
Recoil fluid capacity______________________pints. _
Maximum vertical range (HE shell)__________yards._
Maximum horizontal range (HE shell)________do_____
Vertical range, self destroying (HE shell)_do_____
Horizontal range, self destroying (HE shell), .do_
Weight of high explosive projectile________pounds__
Weight of armor-piercing projectile________do_____
Maximum number of rounds permitted to be fired before cooling_____________________________rounds. _
Weight of 1 round (HE shell M54)___________pounds. _
Weight of 1 round (AP shot M59)____________do
b. Gun, machine, caliber .50, Browning, M2, water-cooled, flexible.
Weight of gun with water, 36-inch barrel._.pounds. _ Weight of gun with water, 45-inch barrel___do_____
365
104
119
78
53.53
2,000
2,600 120
Vertical sliding Hydrospring 10%
Oil, recoil, light
3^
6,200
8,875
3,960
4,070
1. 34
1.9
80-100
2.62
3.12
110.00
121.50
94.00
100.50
14.50
17.08
Weight of gun without water, 36-inch barrel..do_____
Weight of gun without water, 45-inch barrel..do_____
Weight of barrel assembly, 36-inch barrel____do_____
Weight of barrel assembly, 45-inch barrel____do_____
4
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 4-5
Over-all length of gun, 36-inch barrel________inches. _ 57.00
Over-all length of gun, 45-inch barrel________do______65.93
Number of grooves in barrel___________________________8
Rate of automatic fire____________shots per minute. _ 500-650
Chest, ammunition, caliber .50, M2, emp ty_ pounds __ 29 Chest, ammunition, caliber .50, M2, loaded____do______89
200 links, caliber .50________________________do______8
200 cartridges, caliber .50, Ml_______________do______52
Section II
INSPECTION
Paragraph General_________________________________________________________ 5
Gun as a unit_____________________________________________________ 6
Gun tube___________________________________________________________ 7
Lock frame and driving springs_____________________________________ 8
Tube extension assembly____________________________________________ 9
Feed box mechanism________________________________________________ 10
Recuperator mechanism_____________________________________________ 11
Back plate buffer_________________________________________________ 12
Trunnion block____________________________________________________ 13
Firing mechanism__________________________________________________ 14
Chassis___________________________________________________________ 15
Buffer mechanism__________________:_______________________________ 16
Counterpoise cylinders____________________________________________ 17
Elevating and traversing mechanism________________________________ 18
Foot-firing mechanism_____________________________________________ 19
Leveling mechanism________________________________________________ 20
Brakes____________________________________________________________ 21
Equilibrator-------------------------------------------------- 22
Cradles___________________________________________________________ 23
Outriggers-------------------------------------------------------- 24
Wheel alinement--------------------------------------------------- 25
5. General.—a. Purpose.—Inspection is for the purpose of determining the condition of the materiel, whether repairs or adjust-
ments are required, and the remedies necessary to insure serviceability and proper functioning. Unusual conditions of the gun and carriage noted at inspection will be recorded in the Artillery Gun Book,
O. O. Form No. 5825.
Z>. Scopes—The instructions with reference to inspection of the gun and recuperator mechanism are additional to those enumerated in TM 9-235.
c. References.—For additional instructions regarding inspection, see OFSB 4-1, Maintenance of Materiel in the Hands of Troops, and the first page of the Artillery Gun Book.
5
TM 9-1235
5-8
ORDNANCE MAINTENANCE
d. Tools for inspection.—An 0.010 armature gage is provided for checking brake drum clearance. Its use is detailed in paragraph 456(1).
6. Gun as a unit.—The intricate and interrelated mechanisms of the gun call for a high degree of cleanliness of all parts. No accumulations of grease, dirt, or grit should be present and the parts should have neither burs, scratches, dents, nor any imperfections which might change dimensions or in any way interfere with their smooth operation. Ascertain that all sliding, moving, and pivoting parts operate smoothly and freely and that the various springs function properly. Cotter pins must be spread so that no projecting ends will interfere with the mechanism. Check the mounting of the gun in the cradle. There should be no looseness. Examine the gun for loose or missing parts.
7. Gun tube.—a. Life.—Note the condition of the bore for rust, corrosion, worn lands and grooves, and for erosion at the origin of rifling. Examine the firing chamber for scored surfaces. The estimated average accuracy life in full service rounds of the 37-mm gun M1A2 is approximately 2,000 rounds. The gun in service should be star gaged after firing approximately 200 rounds, 1.800 rounds, and after each 200 additional rounds during the remainder of its service. Also, it should be star gaged at any time an inspector may deem it necessary on account of doubtful conditions, or when the bore shows signs of unusual wear or other irregularities. In this gun the greatest distance from the muzzle at which star gage measurements may be made is 68.25 inches. Decoppering of the bore of the cannon before star gaging is prohibited.
~b. Impressions.—For pastilles, or other defects of the bore of the gun which require plaster of paris or gutta-percha impressions for measurement purposes, plaster of paris should be used if practicable, as it gives a harder surface than gutta-percha and a more accurate measurement is obtained.
c. Mounting.—Inspect the mounting of the tube for proper action of the tube lock. There should be no looseness between the tube threads and the tube extension socket. Check the portion of the gun tube that recoils into the trunnion block bushing for signs of wear or abrasion and also for proper lubrication. A coating^of grease, graphite, hard, will be applied at this point on assembly.
8. Lock frame and driving springs.—Ascertain that the driving springs operate smoothly and with sufficient force to load a cartridge into the firing chamber. Examine the operating cams in which the operating lever rides. Examine the mounting of these
6
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 8-14
cams and the two switches that guide the operating lever. These parts should all be free from rough spots and the operating lever should slide smoothly in its guides.
9. Tube extension assembly.—Remove the recuperator piston rod nut, remove the driving spring assembly, and move the tube extension back and forth by pushing the tube back and forth in the trunnion block. The tube extension should move back easily with no rubbing or scratching action. Note the action of the carrier cam on the carrier, the ejector in the ejector cam, and the feed lever operating stud on the feed lever. Remove the tube extension and examine the various components assembled to it for their proper actions.
Caution.—Do not have gun elevated while the piston rod nut is being unscrewed and the tube extension removed.
10. Feed box mechanism.—Examine the various links, pawls, and mechanisms in the feed box assembly for burs or scratches that will prevent their smooth action. The feed slide return lever should easily force all parts back to their original position. The action of the feed pawl assembly, cartridge feeder holding pawl, and cartridge feeder stop pawl is such that the cartridge feeder is moved to the right one clip at a time.
11. Recuperator mechanism.—a. Recuperator action at high elevation.—The recuperator mechanism should be capable of returning the tube to battery with no shock. If the gun remains more than y8 inch out of battery, the round will not be fired. Fire several rounds when the gun is elevated to its highest degree. There should be no interruption in the operation when the gun is fired in this setting.
b. Leakage.—Examine the back cap of the recuperator cylinder for leakage of oil. Note all other oil leaks.
c. Expansion tube.—Remove the expansion tube and examine the inside. This tube should be clean, dry, and free from oil.
12. Back plate buffer.—The entire shock of the recoiling lock frame should be taken up by the buffer springs. The buffer plunger should not be forced back far enough to strike the rear wall of the buffer cylinder.
13. Trunnion block.—Examine the trunnion block (fig. 1) and feed box for loose rivets, malformed plates, or other signs of weakened construction.
14. Firing mechanism.—The gun may fail to fire even though the trigger is pulled back by the foot-firing mechanism and the ammunition is in good condition. In this case note w’hether the
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TM 9-1235
14-16
ORDNANCE MAINTENANCE
tube, tube extension, lock frame, and breechblock are in battery or not. If they are in battery position, then check the functioning of the firing mechanism of the gun. Examine the trigger, trigger bar, trigger levers, trigger trip, sear, firing hammer and firing pin. These parts should work smoothly with no binding, and should be free from dents and burs. Smooth down such imperfections with crocus cloth or a fine file and then note their action.
GUIDE - A25492
RIVET - A25494
CAM - BI63259
PLATE-D36260
PLATE - BI63260
PLATE - D3626I
PIN, TAPER-BFCXIFF
BODY-D36259
RA PD 4303
RIVET-A25495
PIN-A25493
PIN-A2549I
BEARING A25490
Figure 1.—Trunnion block.
15. Chassis.—Examine the chassis for the following:
Bent, broken, or cracked plates.
Broken welds.
Points of attachment of the buffer mechanism.
Points of attachment of the counterpoise cylinders.
Points of attachment of the axles and axle arms.
Operation of the gun support.
16. Buffer mechanism.—a. Operate the buffer mechanism from traveling to firing position and back again. There should be no undue binding of the motion.
b. Note the points on the axle arms where the buffer rod bears: against the axle arm. The amount of wear on each of the two front
8
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 16
KNUCKLESTEERING,SEE 026799
/-BRACKET-D4.728B /JI ___~ ______HTTINfl'CLOXIA
/ LEFT FENDER ASSEMBLY* C53753B 4 k —--X/ rz-— " „
l-fr /r-~ \ L i iwt-bbhxi/^U L/yZpZ^/ixxFzxTx—-—puraFoxss
/ \ PLATE PLATFORM D26888-, 1 /sHER-A.4676^ || ’K / //// ^^'':::=^r^^;;/s"ERING-053530
\ \ U H IhN-BFAX.EL //^^ACKEI’-0268788
L-y I \ \ \ \ / J p NUT-BBFX2E1 _ X\V< /// [Y'X
Ar ttz3_1_____V ,Z xF f ||j pin-bfaxidtj !jg X z—'jtr// i i//
[}—_______J I ARM,AXLE* D268I9B X (C'" =34. "TfeTX \ ZWj?vV
/wMW /// tfWW uUr / / 7 /
/ / / 0 0 10 0
I I /
/ 7 0 5 0 0 0 FT ASSEMBLY // / / ZSHACKbE-»56f^^^ / BI6O255
=/V / 0 0'0 0 x6B3j u // /rX»bg^w^/ " 9
Xv\ / 05000 / J \u/ MwXbBFX^ -SHACKLE A! 1569
X<\ \7 0 0 0 0 4 21 n// /4ln-bfaxidk\ / X/k L
/ H + 0/ 000 i Ax/et'BMCX3A^/u
---LJJ ...... 0 0J 0 0 LX-----M j/W; ■ (I C I 7T \ J [........0/ 0 0 0 0------------------mf3>X\W—'Q A------------zWAX
X/A 0 0H F0 0 0 E AurnEhU \ / X
Xy X 0 /An / /fn w]T 7 / , 1~7 Z~X 1 " /' / z> Xu2\ U, Xx
F1LuT-A148277A y. \ f /jf I I ■■ Fl ---■ ( ■(■ H--U''X^=,
■ \. v\ 0 0\ arm, axle- 0268I9A—"1 ~~ ■/* ’t' ). \ \ \ J^V*V U/!L—
\ \< \- -4- I \ knuckle,steering! K*r;J U (Q, i wtttrU
-------------- '' Z- - \ SEE D26799_j7 1 IjbRACKET^ “X ') i r 1 4LJPLATE-AI47452B-\ -4 F KEY-AI46806-) / [Ab- FT T 1026878A \ \\\ a
1SCREW-AI48I54 \ I CJHU- TU, /p\ I \ \\ /--X-
-BRACKET-04I728A 4»- XX W Wf^X/jSOCKET \ \\
r F4 /H-*~I IIC53533A \ vK
-ft- RIGHT FENDER-\ < •* ' / /--L, L \
ASSEMBLY-C53753A I _ _f SUPPORT-C53578B OR C53962B
\T sections---f/RMiSTEER|NG.c5j529 RAPD 23904
Figure 2.—Chassis assembly (pertains to fig. 3).
TM 9-1235
16-19 ORDNANCE MAINTENANCE
axle arms should be about the same, as should the wear on each of the two rear axle arms. Check the axle arms against FSMWO A29-W4.
c. Note action of buffer cylinders as the carriage is jarred. There should be no binding of the buffer rods. Make sure that the springs are not broken and that they do not have a permanent set.
d. Check the buffer levers and locks for ease of action. The lock should secure the buffer lever in either position without the possibility of becoming disengaged.
17. Counterpoise cylinders (fig. 6).—a. Note the action of the carriage as it is let down into firing position and raised to traveling position. The counterpoise springs should allow the carriage to descend to the ground without undue force and should enable it to be lifted to traveling position by one man at each wheel. If necessary, adjust the springs and test again. If such adjustment cannot be obtained, replace the defective springs.
b. Counterpoise cylinder wrenches, described in TM 9-235, will be used to adjust the counterpoise springs.
c. Note the points of attachment of the counterpoise cylinders. These should be well lubricated and should give full support to the counterpoise cylinders as the carriage is raised or lowered.
d. Check the connection of the counterpoise spring rods to the brackets on the axle arms. There should be neither binding nor undue looseness at these points. Binding may be due to a bent counterpoise rod, bent pin that is pressed into the end of the rod, or defective bearings on ends of the pin.
18. Elevating and traversing mechanism.—a. Test for backlash. If this exceeds % turn °f the handwheels, disassemble.
b. Check the mounting of the handwheel and shaft brackets to the top carriage for looseness.
c. Note the operation of the two speed ratios in the elevating and traversing mechanism of the M3 and M3E1 carriages.
d. Listen for any chattering sounds in the gear cases that would indicate defective gears, poor gear meshing, or defective bearings.
e. The handwheel loads of the complete elevating gears of the M3 carriage without the elevating rack or sight will not exceed 3 pounds for high speed or pound for low speed.
19. Foot-firing mechanism.—Note the action of the foot-firing pedal and lock. When the pedal is depressed, the gun fires. When foot pressure is removed from the pedal, the firing mechanism should spring back to its initial position and the pedal should lock. If it does not do this, check the entire mechanism for binding or weak or broken springs.
10
TM 9-1235
19
3 7-MM ANTIAIRCRAFT GUN MATERIEL
PIN-BFAXIEL -SCREW-AI47947
PIN BFAXILL^^-_—\ /counterpoise
NUT-BBHXIC--r] \BRACKET-D268788 \jassembly-02S7RS
WASHER-AI46762 __-•{H \ / \U*S5EMBLT DZ6786 - f-
SPINDLE-BI27858 Hl \ / X I /
ARM,AXLE-0268258-- \ / l\ JI I /
—. U/a Z+\ 0 W 0 0 0 X PLUNGER-AI47I49
Z^A + II il ® 0 X® & ® <3 X /BRACKET (CHASSIS)-D26895
WASHER BECXIK^r -JI--|L f____+__IL [|0 0 0 Si 0 0 0 X. /ASPRING-AI47II9
FITTING-CLDXIA—VBRACKET.C„68O 0000000 X #ZlEVER-C53675
PIN-BFDX2E-Nq \ BRACKET C53680 . 0 Q 0*1 X I I ////riNG-A.47.18
pTb’Xf0 KM 0 0 0 0 0 0 0 >>
WASHER'BEBXIm] WhM BRACKET-053681 WV1 0 @o0
v 0 0 0 0 0 0 0 //X
^fgOg/ ii I f > ^00000®0®0®0001 (\7 sEcTiowa-*
f V/ " 7 । 0 0 0 0 0 0 0 \ i \
iNTTV PA0-AI47I26 0000000 \ \ A BUSHING-AI46682
A XJlA rTCRREw'BAX5E 0 0 0 0 0 0 0 '^ATE.PLATPORm\V?^ Z/
BRACKET-026895^^ ,^0 0 0 0 0 0 0. °26887 AM ^T
wa^rSI/—I ' Lnut-bbaxie 0 0 0 0 0 0 0 + / 7-T r
“aX.^M \ -BUFFER ASSEMBLY 0 0 0 0 0 0 0 /
\ 026833 0 0 0 0 0 0 0 A SECTION C-C
SCREW-BCEX2AA- 0Q X0000 7
®^0 PL ATE-AI47452A1 BOLT-AI46757A ->
___-A A________ f 1—___________Zj /A SCREW-AI48I54_|7 LINK-C53656-------> rr ________________________- /TvX^-______________/ 4 CONNECTION-C53655-J
ARM,AXLE 026825A _H / \ flTTING-CLDXIA \ i: L ^NUT-BBFX2C
SPINDLE-8127858 U \\ COUNTERPOISE ASSEMBLY D2678s+> ^|pJN-BFAXIOK,
WASHER-AI46762 -\ COVER-8127954
NUT-BBHXIC------- XSCREW-BCEX2BA RAPn?^ VIEWJfE
oiu QCAviei__LWASHER-BECXIH KAKDdOyUO
rlN”BrAXIEL '1
Figure 3.—Chassis assembly (pertains to fig. 2).
11
TM 9-1235
19
ORDNANCE MAINTENANCE
SOCKET-C53533A V^ROD^-B.ksO ,
STU0.BALL-8I34854 \ \ /NX ' O
SEAT,BALL-AI4677.0\N|H^r3 J/xJx
ARM-C53529, ~ / V '^W
NUT-AI48433|\ W^-PLUG" AI46769 /// / 7
PIN-rfav,™ \\ ®?^Ss^PIN-BFAX2A0 A. /VCAP-C53686 “==--------------------------,
L0CK-C53685-x JI //^AXLE-0UTER’C53545A •
LEVER-BI60278-Z \/// JSCRE*’BCAXIE0 CAP-C53686 Z 00G-AI47094 “ ,---FORK-8127837
I / Nr Az,. ZWASHER-BECXIM /„, f nuTFU-rwdW \ PIN-BFDX2AL3 \ | \ -JOINT-81278368
-- __Rl Kmur-DinTnA * AXLE,OU ILK G53DADA \ ।\ ... ■ x, AXLE, INNER-C53546A BUSHING 8127804 / \ \ F0RK-BI27837-3 STUD-BI2783I
p~~\ \ BEARING-C53556A / / /EITTING'CLDXIA \ XROO,TIE-8127830 \ IPLUG-Q52A
/ \\ JJaA/ FITTING-CLDXI a -- i / /sUPPORTtCHASS'Sl-CSSGSO --BRACKET-026922
/ / / ARM.AXLE-0868I9A ~~T~~7M» X SECTION L'L
/ / JpTn-BFEXICL NUT-AI4679I—
/ 'Xv PIN-8FaxIC0 SCREW-BCTX2C JJ . / JzJTT"?'------ i ------I AXLE.INNER-C53546A
4hAFT-C53558AX —LINK-8160279 CHASSIS-026918. . KEY-AI47276
ol T \^/Z / T|TC/ZA-- BRACKET-026923
PIN-BFAXICdK SECTION F-F - J' SUPP0RT(CHASSIS)-C5365l
- BUSHING-8160276
SECTION G-G L0CK-C53685 RAPD 23902
Figure 4.—Chassis assembly (pertains to figs. 2 and 3).
12
TM 9-1235
TEXAS STATE COLLEGE FOR WOMEN
LIBRARY
37-MM antiaircraft gun materiel
19
v \ \—1 \\ \ GrK ' / JSCREW-AI47436
Lm\ 7 /N \ Xa \\ \ IwASHER-BECX.K
-PINTLE ASSEMBLY- Jr i kW OmJ /
028024 lj_______-j- I 'fQ- ______________ 1 FTT UmtH J
TJ \XrSy/ “r TAXN^EW-BCE^BAnsCREW-BCAXIEcll Y \ \ y7t_ 1
\ 'X'a \ \ /yiWASHER-BECXIH WASHER-BECXIMf \ \ V HSCREW-BCAX2AG
\ BUMPER-BI27893r/PIN-AI46798-l \/ ^COVER-6127954 PIN-BFDX2CC \ \ \ ]n_UT-AI48277B
\ PIN-AI4734I _J SCREW-BCAX2BC1 LSUPP0RT-C53577 OR C53963 \ \ \jSCREW-BCAX2AC
\ WASHER-BECXIRf FOR REAR WHEEL HUB ASSEMBLY,SEE D26B00 \ \JnUT-AI48277B
\ / FOR REAR WHEEL,OISC AND RIM ASSEMBLY,SEE 026784 \ SCREW-AI48I98
v ' FOR REAR WHEEL BRAKE ASSEMBLY,SEE D2684I ----COVER-8127859
_________________________FOR HAND BRAKE ASSEMBLY,SEE 026925
ARM-C54408-\ /—PIN'BFAXIDT
r- FITTING-CLDXIA vBE ARING*C53556B PIN-BFAX2DD-\ \ /,—NUT-BBFX2E .FITTING-CLDXIA
IA—8EARING-C53556A A NUT-BBHX2B-X \ / / FITTING’CLDXIA PIN-6127819
BUSHING-8127804 ])|T\ WASHER-BEBXIwXX \ m/r STUD-8127831 -END-C53670
WAyy---------- FITTING-CLDXIA\\\\i /-PLUG-QSgA /O-RIVET-BMCX3
| -- Y’-j----' * WASHER-AI46764\ VCT/Xyy / ,
W nl" ^AXLE.OUTER-C53545B ' / ' " P?’ N0T USED *HEN “ LEVER*-C53532X'^^^^-^~^^rf^^^^^^^^^XA-----'"^"8l278l7
AXLE.INNER-C53546B-X 1 PARTS ARE SPLINED. ^^WSTBI27824
j(|lk [80LT-A1468I2 ( t \ !nUT-AII250
GJ y WASHER-BECXIP [L$ I if JPIN-BFAXIDT
T 1NUT-BBAX2B BRACKET-026923 /// W A. IFITTING-CLDXIA
SECTION R-R AXLE,INNER-C53546A-y' [I -CONNECTION-C53655
P P AXLE,OUTER-C53545A7/ /Z-NUT-AII250
KEY-AI47276--' L----PIN'BFAXIDT
SECTION D-D RAPD 23901
_WILI- JUST STAY IN UP POSITION BRACKET-D26878A SCREW-BCDXIBB--7
Figure 5.—Chassis assembly (pertains to figs. 2 and 3).
13
TM 9-1235
ORDNANCE
MAINTENANCE
19
ROD C53493 HW® e'd'OCp Io O Q TL SPRINC-C87101 .-SCREW-BCUX1FK HANDLE-B127972 NOT SHOWN
CAP-Q52T NOT SHOWN
TN 9—J — SPOT WELD CAPS TO HANDLE AT ASSEMBLY
jjp ([^B_[nuT-A147005 USED WITH CYLINDERS-D26889A AND D26889B
HEAD-A217827J INUT-A146683 USED WITH CYLINDER D26787 ON FIRST TWO CARR'S ONLY
FOR 37 MM M3A1 —~— L_,
5,7™.7 .Ar°N inner trunnion of rear cpoise cylinders
—<, H>/,NIPPLE-A147338 —
(ff JI) 1 ROD-C53493----- \\ / --- CYLINDER-D26889A OR D26889B
n,K, *14Afion --CYLINDER-026787 ON FIRST TWO
M-------n arX A146681 FITTING-CLDX1A CARR'S ONLY
/ I--BEARING-A146681 AHx — COVER Bl27742
/ / /—CUIDE-B127740 VSPRING-D26788 I crocw awt
/ / / zzzzzzzzzzzzzzzzzzzzzzzizzzzzzzzzzzzzzztzNzzzzzzzzzzzzzzz^zzz^^Q--OCKtw-DV-1 AZN
/ / / (Si ® F§---------PISTON-B127741
/ / / r\r\VlH MlIlllTllO I---GUARD-B161061
Jj 1 I I I 1 11 '___l.l M____________1 I I 11 11 11 IF? Z~> ' , —NUT-A146567
|| H ° 1 INCH R0D $ I ZF/F-------------N UT- B BAX2E
...K_______SCREW-A148213 r HEAD-A217828 r SPRINC-CsilOl \JsCREw-A148154
yr,,,,,.,.,,,,.,...,. ---1PLATE-A146985
COLLAR - B162441-1
GUI DE-Bl 62440-k-) AH ill ' Wfts
] 1/4 INCH ROD Z2-ROD CR7O54- kMu«mnWn J
ROD-C8 /U?4 L. —. HEAD-A217827
KM CYLINDER. COUNTERPOISE RA pD 55Q3
Figure 6.—Counterpoise cylinder assembly M3, M3E1, and M3A1 carriages.
14
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 20-21
20. Leveling mechanism.—a. Operate both leveling screws through their entire range to note their action. There should be no undue binding in this motion.
b. Note the level vials for broken or defective tubes and proper level bubble indications as the top carriage is tilted by means of the leveling screws.
c. Set the carriage in firing position on a smooth hard surface and level it by means of the leveling screws. Traverse the carriage through several complete revolutions and elevate and depress the gun and cradle at the same time. Note the action of the level bubbles during this operation. If they do not remain on the scale, adjustment of the level vials or repair of the leveling mechanism will be necessary. (See par. for a complete description of this test.)
21. Brakes.—a. Wiring, connections, plugs, and battery require the same type of care that this type of material gets on automotive vehicles in order to provide electric current for brake operation at the four wheels. A truck storage battery that will turn over the engine has sufficient current to operate the brakes. The disk electric brake circuit in good condition will draw 2V> amperes at each wheel. The lever type electric brake circuit in good condition will draw 2.2 amperes.
b. To check the brake circuit disconnect the live wire at the wheel brake and place the ammeter in series with that wire and the brake. Leave the other brakes in circuit. When this connection has been made, set the load control at No. 4 position and apply the controller full on. The ammeter should indicate the values stated above for each type of brake. Repeat on the other brakes. Variation between brakes should not exceed 0.1 ampere. If the current is below these limits, the wires and connections should be thoroughly checked and repaired as required.
c. Wheel units are subject to—
Brake lining wearing out.
Grease getting in and on lining.
Grease getting on the magnet facing.
Worn or loose wheel bearings.
Warped and out of round drums.
Brake band distortion.
Broken springs or warped armature.
Any malfunctioning of brakes after checking the wiring will require disassembly of the wheel, and any of the above conditions should be corrected or new parts installed. A glazed magnet facing due to grease can be roughened by coarse emery cloth.
15
TM 9-1235
21-25
ORDNANCE MAINTENANCE
d. Insert the feeler gage in the inspection hole and between brake lining and drum (fig. 39). Clearance should be 0.010 inch.
22. Equilibrator.—a. Elevate and lower the cradle and gun several times. Note the force required on the hand wheels and the motion of the cradle. The cradle should rotate smoothly in its bearings and the handwheel forces should not become excessively great.
b. The two nuts screwed to the end of the piston rod can be adjusted to vary the compression of the equilibrator spring or springs. As the nuts are turned further on to the rod, it will be easier to elevate the cradle and harder to depress it. Equilibrator cylinder wrenches, described in TM 9-235, are used to make the adjustments on the equilibrator cylinder.
c. If adjustment of the equilibrator cannot properly balance the gun and cradle, the spring or springs will have to be replaced.
23. Cradles.—a. Remove the gun from the cradle and examine the gun slides of the cradle. These slideways should be straight and smooth, showing no signs of wear or rubbing action caused by a loose fitting of the gun in the cradle.
b. Inspect the elevating rack for the condition of the teeth.
c. Elevate and depress the cradle and examine the action and assembly of the trunnion bearings. There should be no indications of binding or looseness.
d. Examine the cradle for broken or bent parts and for broken welds.
24. Outriggers.—Examine the outriggers for the following: Bent or broken plates.
Broken welds.
Operation about the hinge pin.
Operation of turnbuckle in firing and traveling positions.
25. Wheel alinement.—a. Checking angles.—Check the angles in both front wheels in the following order:
(1) King pin inclination.
(2) Camber.
(3) Caster.
(4) Toe-in and toe-out.
b. Preparations for checking alinement.—Before checking the alinement of the front wheels, perform the following operations:
(1) Inflate all tires to recommended pressure.
(2) Check wheel and tire run-out (wobble) and eccentricity.
(3) Check brakes for dragging.
(4) Check wheels for proper balance.
16
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 25
(5) Check front wheel bearing adjustment.
(6) Check king pin bushing clearance.
(7) Check steering connections for lost motion.
(8) Place vehicles on level floor.
Note.—The instruments used in checking wheel alinement are similar in principle to, though not identical with, those illustrated in this paragraph.
c. Checking alinement.—Set the front wheels in straight forward position, with the drawbar in a direct line with the center of the carriage. Place the wheel aliner between the front wheels in a vertical position as shown in figure 7. Check with a spirit level and make sure the abutment bars are both perfectly level. Care must be taken to force the aliner as far as possible into the curvature of the wheel. Dial readings may now be taken at each wheel. The older type aliner will give dial readings in inches only. The newer type aliner gives readings in inches and degrees, showing the pitch of each wheel. The dials on both types are graduated to accommodate various wheel diameter sizes. Use the dials which most nearly correspond to the wheel diameter. If the pitch is greater than 2°, check for worn bushings, spindles or other worn parts in the steering assembly. Replacing worn bushings or spindles is the only way to correct faulty camber. A direct adjustment cannot be made because camber is a built-in feature of the axle.
d. Checking caster.—Jack up the front axle so that the wheels clear the floor. Set the wheels in straight-forward position. Remove the hub caps from the front wheels and place the caster gage against the wheel, being sure that the gage is level according to the spirit level. Adjust the gage so that its left spring plunger seats into the lathe center at the end of the wheel spindle (fig. 8). Swing the wheel spindle around so that the right spring plunger will seat into the same lathe center (fig. 9). To do this the right plunger will have to be adjusted, due to the caster angle, thus causing the scale pointer to indicate the caster angle in degrees. The fact that the front wheels are jacked up must be taken into consideration when reading the caster angle. Deduct %° from the reading on the gage to obtain the actual caster angle. Replace bent parts if caster is incorrect.
e. Checking front wheel toe-in.— (1) Place the wheel aliner between the front wheels in a horizontal position as shown in figure 10, leveling both ends with spirit levels. Press the aliner as far as possible into the curvature of the wheels. Turn the wheels until one dial registers zero. Press the front wheels apart at the front to take out the slack, keeping the pointer on one dial at zero. The other dial will then register the combined toe-in of the two front wheels in inches.
465292°—42----2
17
TM 9-1235
25 ORDNANCE MAINTENANCE
w w jlk op s || nv —mb
in > 1 • a Hl K f ® -HI
I ll I f J 1 II r jB w* wu* * 1 : ^" • fl Wg
—■■ —-AiJGNER DIALS ....—-2—-
OBISSfiiii n l'Mo&oI " — ...; :: ■ J„il_:'..■'1'iriiJiiniliMTifM' * .. .. ■ *. >2
••■ VV— ABUTMENT BAR (BOTH SIDES) ‘ FRONT WHEEL ALIGNER "MJ J
... SP,R!T LEVEt !B0™ssocs’
RA P0 7687 ^q|MF
Figure 7.—Front wheel camber.
18
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 25
Figure 8.—Caster gage w/left spring plunger in wheel spindle lathe center.
Figure 9.—Caster gage w/right spring plunger in wheel spindle lathe center for gage reading.
19
RA n 7689
RA PD 7688
SPIRIT LEVEL——....
LEFT SPRING PLUNGER•—-~
DIAL AND POINTER—
RIGHT SPRING PLUNGER-—-'"'
SCREW FOR ADJUST ING
HEIGHT OF GAGEJ
TM 9-1235
25
ORDNANCE MAINTENANCE
(2) If the combined toe-in is greater than 14 inch (% inch for each wheel) as shown on figure 11, press the wheels apart and watch the pointer; this will show the amount of play in the bushings and tie rod connections. Do likewise if a combined toe-out registers, as shown on figure 12.
/. 'Wheel alinement malfunctions.—All alinement angles are so closely related that any change of one will automatically change the others. The following list represents the more common difficulties in wheel alinement.
Malfunction Possible cause
(1) Shimmy (generally exists at (1) (a) Tire pressure incorrect.
speeds below 30 mph). (2) High speed wheel tramp (gen- (&) Tires of unequal size or weight. (c) Wheel bearings loose. (d) Steering mechanism loose. (e) Too much caster. (/) King pins and bushings worn. (ff) Tie-rod ends loose. (2) (a) Tire and wheel assemblies
erally exists at speeds above 35 m.p.h.). (3) Wander or weave. (4) Hard steering. (5) Uneven tire wear. out of balance. (b) Buffer assemblies ineffective. (3) (a) Tire pressure incorrect. (b) Tires of unequal size. (c) Bent spindle. (d) Wheel bearings loose. (e) King pins and bushings worn. (f) King pins bent. (ff) King pins tight. (h) Steering assembly tight or loose. (t) Too little caster. (j) Too much or too little camber. (k) Too much or too little toe-in. (1) Tie-rod ends tight or loose. (m) Front axle bent. (n) Front axle shifted. (4) (a) Tire pressure low. (b) Wheel spindle bent. (c) King pin assembly poor fit. (d) Steering assembly tight. (e) Tie-rod ends tight. (f) Caster excessive. (5) (a) Tire pressure low. (b) Excessive camber. (c) Wheels out of balance. (d) Tires overloaded. (e) Eccentric wheels or rims. (f) Caster incorrect. (ff) Toe-in incorrect.
20
TM 9-1235
25
3 7-MM ANTIAIRCRAFT GUN MATERIEL
liSt •-*Jt 1 k 11 i f; JF J
f F I (gl f
W *1 © wi F Jn Ir lf
Jlrw) mV -a? □wjr li :’'IPMw^MEu WF #■» wiw-WKwIIr p~Rfe*?.: sBKbs®
■■ i? .. K-) V
^4 fW • f J >| mg
JI *** ^w'^MRjT'F'pA
< F^fe”^''" wlBwW j’im i-_v< 1- <■ fpML^Myj^pra(->
* 1 \ -W >- > >r flkx
twrB. y;jy
Figure 11.—Scale reading showing 1% inches exaggerated toe-in.
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 25
O ♦ „.
Jr w >
*'. Jr -* ■ ’
.."J. jg|| ._
\ ■ W ■»•■ * - - •■
’W® rsM® O -4--
J I wV ■ ) ;-:
Z^Mk \ W ' < -
^w -% >' ’ o I 21
' m"! S "
Ji 1
^JLl^ g
‘ sfcri; ' "2
SJlascW/ 7;
I
1
F
11
B'
23
TM 9-1235
26-29 ORDNANCE MAINTENANCE
Section III
MAINTENANCE AND REPAIR
Paragraph General__________________________________________________________ 26
Tools for maintenance and repair_________________________________ 27
Overlapping of maintenance functions_____________________________ 28
Recuperator mechanism____________________________________________ 29
Driving spring assembly__________________________________________ 30
Chassis-------------------------1________________________________ 31
Buffer mechanism------------------------------------------------- 32
Outrigger assembly----------------------------------------------- 33
Electrical circuit______________________________________________ 34
Traversing mechanism, M3 and M3E1 carriages---------------------- 35
Traversing mechanism, M3A1 carriage______________________________ 36
Elevating mechanism, M3 and M3E1 carriage------------------------ 37
Elevating mechanism, M3A1 carriage------------------------------- 38
Foot-firing mechanism, M3 carriage------------------------------- 39
Foot-firing mechanism, M3A1 carriage----------------------------- 40
Leveling mechanism, M3 and M3E1 carriages------------------------ 41
Leveling mechanism, M3A1 carriage------------------------------- 42
Wheels___________________________________________________________ 43
Wheel alinement__________________________________________________ 44
Lever type of brakes--------------------------------------------- 45
Disk type of brakes---------------------------------------------- 46
Equilibrator, M3 carriage---------------------------------------- 47
Equilibrator, M3E1 carriage-------------------------------------- 48
Equilibrator, M3A1 carriage-------------------------------------- 49
Cradles, M3, M3E1, and M3A1 carriages---------------------------- 50
Lubrication------------------------------------------------------ 51
26. General.—A list of malfunctions, causes, and their corrections is included in TM 9-235. In addition, ordnance maintenance personnel are responsible for maintaining the rest of the materiel in proper working condition.
27. Tools for maintenance and repair.—Recuperator and piston rod nut wrench (B163290) is shown in figure 13. This wrench is used to remove the front and rear recuperator end caps by means of the projecting pins on the wrench and the mating holes in the caps. The open ends of the wrench are to be used for the recuperator piston rod nut and the expansion tube.
28. Overlapping of maintenance functions.—Second echelon operations described in TM 9-235 are sometimes performed by ordnance maintenance personnel, who should refer to this manual for information.
29. Recuperator mechanism.—a. Adjustment.— (1) One of the reasons why the tube, tube extension, and lock frame do not come
24
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 29
into battery is a weak or broken recuperator spring. If the recoiling parts are more than % inch out of battery, the gun will not function. Before attempting to replace or adjust the recuperator springs, the rest of the gun mechanism should be checked carefully to see that no other malfunction is present.
(2) If necessary to adjust the recuperator mechanism, the following procedure should be carried out: remove the recuperator front end cap (B163280, fig. 14) and packing with the wrench (B163290) supplied for this purpose and catch the recoil oil in a clean dry con-
Figure 13.—Tools.
tainer. The recuperator spring can be adjusted by removing the cotter pin, which is now exposed, and turning the recuperator piston about one turn in or out on the piston rod. Turning the piston in will tighten the spring and insure the tube returning to battery, but this will also cause the action to be accompanied by shock. Turning the piston out will reduce the action of the recuperator. No further adjustment of the piston is permissible and the cotter pin should be replaced at the end of the adjustment. Replace the cap and packing
25
WRENCH C59566
WRENCH B 163290
RAPD 4292
HANDLE B-108566
TM 9-1235
29
ORDNANCE MAINTENANCE
and refill the recuperator with a fresh supply of oil, recoil, light. The action of the recuperator can then be tested by firing the weapon and noting the recoiling and counterrecoiling action.
-BUSHING - C70478
/r L0CK-BI63282
/ \r-SCREW- A25534
r-GUARD - 070479 / V\ pLUG - A2553I
//"SPRING-BI63285 / \\/PLUG - A25532
^■PACKING-A25524 ///.SEPARATOR- BI63284 / \\\ /
//-GLAND - A25522 /// / / \ \ \ /
///-SPRING - A25526 \ _____________/ \ \\ / /P|STON ASSEMBLY
/ //-HOLDER-A25523 P/7 \ / 1 ) \ \ / ,/ A25538
/ Z/Z.........- - - - /z z, ,z - - .--MA " v;* Bl6328°
TUBE.BI632B6
\ F/....... ' < "<■ /
\ 4cREW - A25525 1--------------¥--------------—---------------------p
\ LpACK|NG- A25529 \ SOCKET-D36266 (O© U
\ L—CAP - BI6326I \ SCREW- A2 5533 ____________p
'-R0D-BI63283 \ SCREW - A25535—
\ PACKING -A25530-FF\j=||^L________
GUARD - C70480 - '.Ts T~ P
j-----------------------p ~'~;550T / /
LEVER-A255I5^XX \ "I Lfr ///L /// 7 2
PIN-BFAXIBdC\XX MAA * A T3 -Fl- ///// z BREECHBLOCK,ASSEMBLY-0163236
BAR-BI6327^\F$7v / LJ 0 A / / // I A /// / TUBE D36253\
SCREW-A25404\ /-/-PZ-J A/ ) [A '■// / / / n BUSHING-B 163278, \
I FiAj. tesamft/ SCREW-A2552IJ ' \
Hi/—-——\Tjg FhtF' -P-Mpm—i
:;1 \ \ ) I r - U t 1 J}---- fj
rtiil .____A I L A ...l-£L-£L.( Ul-------------v
X. \ \ \\cAM,ASSEMBLY-BI63264 \ \Ax'7v\^l ---1
\ \\'SCREW-A25508 \ rT I ' 1/^ | f Jp Q! -------U
\ YB0DY-BI6327I \\ \ \\ \ [ I I / / \ / -gi Ijlng \
\\XSPRING-A25509 \ \ \ \\SPRING-A25520 1/ \F°9 7_______I I___A dA?.______J
v'sLIDE-B 163272 \ \ \ \ PLUNGER-A255I9 111 IA \ 'NUT~A25527 // j
PLATE,ASSEMBLY-070508 \ \\'PIVOT-A255I8 I \ rAA—« -U Y0KE-BI63270 / /
\ Y'SWITCH-BI63279 III SCREW-A25537 /
\ 'crorii/—apRKnv I III RECUPERATOR, ASSEMBLY—D3628/
\ SCREW A255O7 UcAM,R.H.,ASSEMBLY-070472 UOO4O/
\TCAM, RIGHT-070474 [CAM, L.H.. ASSEMBLY-070471
[CAM,LEFT-070473 I 1 I lsCREW-A25507
I I 'frame, ASSEMBLY-D36286
I EXTENSION, ASSEMBLY-D36285
^SPRING, R.H, ASSEMBLY-070510
JSPRING, L.H, ASSEMBLY-070509
RAPD 23900
Figure 16.—Breech mechanism assembly.
29
TM 9-1235
31-34
ORDNANCE MAINTENANCE
31. Chassis.—Straighten and re-aline all bent parts of the welded chassis assembly by methods similar to those used on automotive equipment. Any joints or seams having broken or cracked welds must be cleaned and rewelded to give the strength required in the original design of the carriage. The type of welded joint used on any one part of the chassis is repeated on similar parts. Replace broken or bent rivets, brackets, and other parts secured to the chassis.
32. Buffer mechanism (fig. 17).—a. Adjustment.—A small adjustment of each buffer cylinder is possible by turning the two nuts (BBCX2C and BBAX2C) on the top of the buffer rod. As these nuts are turned down on the rod, the spring is further compressed and the buffer rod point is raised. The buffer rod will then move through a shorter range when acted upon by the axle arms during travel. This adjustment can be used if the rod bears down on the axle arm with too great a force.
b. Replacement.—If adjustment of the buffer spring does not produce the correct action, or if it is broken, replacement of the spring will be necessary.
c. Adjustment.—Adjust the buffer by means of the two nuts (BBCX2C and BBAX2C) so that the buffer will just rest on the axle arm in traveling position. During travel the two front buffers should be equally depressed by the axle arms; likewise the two rear buffers.
d. Buffer locking lever hard to engage.—In some mounts it has been found hard to engage the locking lever due to the close fit of the locking lever pin in its seat. It is most important that this pin be fully engaged whenever the mount is in traveling position. Failure to engage this pin may result in causing the end of the mount concerned to drop to firing position while being towed. This may cause a serious accident. If this fault develops in any mount in service, either the locking pin seat should be reamed out, or the pin worked down with fine emery cloth until engagement is easy and positive.
33. Outrigger assembly (fig. 18).—a. Replace missing parts.
b. Re weld cracked or broken welds.
c. Straighten bent parts.
34. Electrical circuit (figs. 19, 20, 21, 22).—a. Repair or replace all wires that are broken or have damaged insulation.
b. Tighten all loose clamps used for securing wires to the chassis and replace missing clamps.
c. When replacing brake wires, leave sufficient slack in the wire leading from the chassis to the wheel to allow the wheel to be raised and lowered and to allow for steering of the front wheels.
30
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 34
31.86 FOR FRONT WHEEL BUFFERS
41.36 FOR REAR WHEEL BUFFERS
— A,
[NIPPLE-AI47338
NOT SHOWN-FITTING "CLOXIG N°T SH0WN --R0D-C53499| (FITTING—CLOXIA LEVER-053959 --BUSHING-AI46708 j OR-C5355O-k |— BUFFER-61277578 \ ZN
/WASHER-BEAXIF // \ — / /
SCREW-BCNX2AB- ^FITTING'CLOXIA \ X / //
RETAINER-8127756 ,x''/nUT-BBCX2C HOUSING "BI27950-- j \ ; LEVER_C53663 /
\ 1 ^^/''ZnUT-BBAXEC SPRING-AI4697O-—_ p IQ I i \
\ JS/Zx/X-WASHER-AI46706 ------------' "L H jS i X Y/'T
\ /SPRING-053498 HANDLE-AI46969 —. ~T-'-'Al A . N. ////)
tzjjl [ tzr /cylinder-026808 SCREW-BCAXIEG] \ i Lfa//L, 1 T^U-| ISn-bfaxibd
WMW../ /^USHING~BI27759 NUT-BBAXIE H .X r^fpIrC—ZpZ—> NUT-BBFXIA /
L—f Rv /BEARING-C53569 WASHER-BECXIMJ XX HSCREW-BCBX7A0 /--ZJSc) ’
______LB //FLANGE-8127862 SPACER-AI468I4-v. X/ I Fw'-' l________WASHER-BEBXIM AQ / / W\ |l LET a//nUT-AI46808 SHAFT-C53558A \ 1XX - LuVEffl ~ _ BEARING-026823—/ / / / \ \
|l LB I / Ampin - bfaxidk \ or 053558b-X. । Xf; —washer-bebxih \ '(&■ \\
i gx |l LB \ l/OU L______ '"/Ar--pin-bfexibk / J/pV7/ / \ \'
11 ---------------X---L_ft-i 1 . q''—pin-bfaxicc / /'Q- >O\/ / \(T)
— -------------------- i _____________________ / y
li M LZ^Z-I------J '
|'i (A gn □ VLJH / ]UFX/2^q7T/^lsCREW-BCAXIC0
->*¥3 II S< XWT' tHr, i , \' H [WASHER-BECXIK
—— z-x /\ ■
--------I J^aTNNx X SCREW-AI48558 ■ I i' V /// /S' /------I \Jj\ N\\ NUT-BBBXIE |[ , {<>/,
Awasher-seaxif I X\\\X WASHER-BECXIM I -'/Lx
[SCREW-BCNX2AB I j \\ \\X ■ I V V
C- | ) j \\VXWASHER-BI27758 I' 1 ' J / I-!::! 1
W <-/ W V RAP0 238S5
.RETAINER-BI27756 LA '
LEFT SIDE XBUFFER-BI27757A DiruT cir> rF_-^-»
. Vr-MT H —1~-—:== (ri’'’Td 4“"*^ "TT A \—6 VOLT BATTERY <-=
Uy. ii i_______________\---------------
wfj J NO-14 WIRE \ / •'1
fr-=f I ___| \ / RIGHT FRONT BRAKE
\ DRILL 4DRAIN \ I । ' ®
E-^ S^h8?^ H w'r°*oSrAcomplete
-fel UgTATASaMgU / MOVEMENT OF WHEELy-_---SOCKET-BI6I8481_~~~
tt-T J \ / I / w C0VER-AI48750J I
l~vfrT 7 ^CLAMP-AIABZAO/ / <>n Z-BRACKET-AI48844
I / 4
L25^~~—-----4m 2l'^d i YOCA’ \
3ce at] r ~~| A*-}" ----, ।---
mblyJ n 1 \ ‘ 4.
XJCTOR N. ^*^x_TWQ CONDUCTOR N0.I4 ---—~r I
E FOR TAIL J |1 ;|RUE for BRAKE.
1 LIGHT, yj |_12__p.27_J RAPO23898
^-SEE-D2684I
Figure 19.—Wiring arrangement and diagram.
465292°—42—3
33
TM 9-1235
34
ORDNANCE MAINTENANCE
" \/l FOR METHOD OF ASSEMBLING fdl irj W.E. 8 TERMINALS NO.IIO283
TWO CONDUCTOR N0.I4—x f0 WIRE.SEE 0WG.-AI48246
WIRE FOR BRAKE. \l\l SEE N0TE F0R SPLICING
>1 1 INSTRUCTIONS.-y
-----20 J-j— ■■ ---IQ.-----
—ju ■—----------— j
- M —lyxL EEUm
2 CONDUCTOR]/'^ t /rfU
N0.I4 WIRE _} . \ [SCREW-BCAXICL \ /I P UliN—jS -------1—.
CONTAINER-054375 — _ ■ HWASHER-BECXIK I / l/W-jBrrT—----------F~-<\
ifWl |nut-bbaxic I / yinnlf- I —
L I | _/ //A W^ .^P,?-f,0UND‘ X\^-------4 CONDUCTOR, N0.I2 PORTABLE CORD, 65 STRANDS N0.30
ILLal I n ~~l f' JffiT LAI47177, COPPER WIRE,COTTON WOUND X. INCH 30 PERCENT RUBBER
[ALLOW SLACK IN WIRE-H I FILLERS OPeTtwVe^rU^
_E7~>o rnuoi err umie r— ■ —I fell L_3 , riLLtnb,UrtN TWINE BRAID AND v€4 INCH. 60 PERCENT VImfnt oFPwHFFi*i°VE'J ^Wfll 'neoprene jacket.outside diam?6% INCH (SIMPLEX-TIREX
_______________\ |MENT OF WHEELS._________ jmijjl X -----NT- ___________ \ ' 0R EQUAL). + \ INSTRUCTION h^f----------------\V- -ZZZ~~_____ ___
/ \ PLATE-BI60334IV---r/mAI— . ~-----------------------------_
SPACER-AI47I7I—\ ! =£ czzdgzzztij r
■ :
I I ~°1--------— 1
• —rm
U PRIME MOVER TAIL AND STOP i
LIGHT WIRING^. j
'■hj fT) v :i=D
V-----------W 11____________________ gj
P -X z—----------r------------x1' 1
--SOCKET
— CONTROLLER
] *—-- LOAD CONTROL
' RESISTOR RAPD23895
1--------STARTER SWITCH
- BATTERY
Figure 22.—Wiring diagram for prime mover.
36
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 35
35. Traversing mechanism, M3 and M3E1 carriages (figs. 23 and 24).—a. Replacement of parts.—Backlash of over % turn of the handwheels, chattering gears, binding of the mechanism, or failure to traverse, will indicate necessity for repair or replacement of parts.
b. Disassembly.—Remove the sighting system M2 from the carriage. Then disassemble the traversing mechanism in the following manner:
Part Means of support Method of removal
(1) Case (D26901) with gears, shafts, handwheels and other parts assembled. (1) Four screws (BCAX1EF), nuts (BBAX1E), and washers (BECX1M). (1) Remove screws, nuts and washers and lift assembled case from its seat on bracket (D26900). Disassemble as described in the steps below.
(2) Cover (A147144). (2) Four screws (BCFX2FG) and washers (BECX1K). (2) Remove screws and washers.
(3) Case (Bl60316) and inclosed gear (B160314). (3) Four screws (BCAX1CA) and washers (BEAX1L). (3) Remove screws and washers.
(4) Gear (Bl60314). (4) On shaft (A147136). (4) Remove cotter pin (BFAX1BE) and drive out shaft in direction of headed end.
(5) Bearings (A147135). (5) Forced in gear (B160314). (5) Force out, using equal pressure all around the bearing.
(6) Handwheel (C53515B). (6) Screws (BCFX2BB) and (A147133). (6) Remove screws in order named.
(7) Cover (B160315). (7) Two screws (BCKX2CF) and four screws (BCFX2DG) and washers (BECX1G). (7) Remove screws and washers.
(8) Gear (B160310). (8) Splined to shaft (B160312). (8) Pull off the shaft.
(9) Nut (BBRX1AF) and washer (BEFX1AF). (9) Screwed to shaft (B160308). (9) Unscrew. .
37
TM 9-1235
35
ORDNANCE MAINTENANCE
SCREW-BCFX2DG
WASHER-BECX1G
SCREW-BCFX2FC
WASHER-BECX1K
FITTING-CLDX1A HANDWHEEL-C53516B
FOOT REST-D26983
PLUG-Q52A
SCREW-BCAX1 EG
WASHER-BECX1M
PLUG, PIPE, ’/4 BRASS
SHIM-A146754
SHIM-A14675
RA PD 6522
Figure 23.—Traversing mechanism, M3 and M3E1 carriages (sections shown in fig. 24)'..
ONE TURN OF HAND WHEEL FOR 11.25° TRAVERSE
TRAVERSING MECHANISM,
GASKET-B127780—1
COVER-053514—। PLUG-Q52B—
ASSEMBLY
SCREW-BCAX1EC
\pj| [WASHER-BECX1M
38
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 35
CEAR-B16O317 ----
SHIM-A147I37-----
PIN-BFAX1BE------
CEAR-B160314-----
BEAR ING-A147135-i SHAFT-A147136-
SCREW-BCAXICA -] CASE-BI60316 WASHER-BEAX1L FITTING CLDX1A PIN-BFDX2AA----
---BEARINC-A147134
-----SHAFT-B 160312
-----SHAFT-B 160308
----SPACER-A147130
----COVER-A147144
---CASKET-A147145
---COVER-Bl 60307
SCREW-BCFX2BB SCREW-A1471 33 GEAR-B160310
NUT-BBRX1AF
WASHER-BEFX1 AF—1
PLUC-Q52A--------
HANDWHEEL-C5351 5B
COVER-B160315--
SCREW-BCKX2CF
SCREW-BCFX2DC
WASHER-BECX1C—
CASKET-A147140
SCREW-BCAX1 EE —
NUT-BBAX1E
WASHER-BECX 1M-
SHIM-A146891---
SHAFT-B127798—
SHIM-A146755---
CASE-D26806----
BEARING-A146715
CEAR-C53644----
WASHER-BEFX1 AE
NUT-BBRX1AE----
BRACKET-D26900
SECTION A-A
SCREW-BCFX2FK
WASHER-BECX1K
CEAR-B160313
r— SCREW-A1471 32
L WASHER-BEAX1 H — SCREW-BCFX2BB ---SCREW-A147133 ---BALL-CCAXIB ---SPRING-FAAX1C -BEARINC-A146556 ---CASE-D26901 PACK WITH LICHT CUP CREASE
----CEAR-C53643 ---CEAR-C53642 ---PIN-BFDX2CC
---NUT-BBRX1AF WASHER-BEFX1 AF BEAR I NC-A 146724 — CASKET-A147141
j- CASE-C53684
4---PLUC-Q52A
j—SCREW-A147139 L- WASHER-BEAX1 L
|— SCREW-BCAX1 EF i WASHER-BECXIM I----NUT-BBAX1E
-----KNOB-A1 1644
I--WASHER-A26257
■--SPINDLE-A26256
SECTION C-C
NUT-BBRX1AF----
WASHER-BEFX1AF
CEAR-C53645----
PACK WITH LICHT CUP CREASE-
KEY-A146720 — RACK-C53647—
CASKET-B127781
PLATE-B127779 —
SECTION B-B
BEAR INC-A147068
------PLUC-Q52A
— PINION-C53648
p WASHER-BEAX4E
1- SCREW-BCKX2CE
RA PD 6523
Figure 24.—Traversing mechanism sections, M3 and M3E1 carriages (sections pertain to fig. 23).
39
TM 9-1235
35
ORDNANCE MAINTENANCE
Part Means of support Method of removal
(10) Gear (B160317). (10) Splined to shaft (Bl 60308). (10) Pull off the shaft.
(11) Case (C53684). (11) Three screws (A147139) and washers (BEAX1L). (11) Remove screws and washers.
(12) Handwheel (G53516B), gear (B160313) and shaft (Bl60312). (12) Shaft (Bl60312) fits in shaft (Bl60308). (12) Drive out shaft (B160312) toward the side of the handwheel by tapping opposite end. Be prepared to catch the spring and balls mounted in the shaft.
(13) Handwheel (C53516B). (13) On shaft (Bl 60312) by screws (BCFX2BB) and (A147133). (13) Remove screws in order named.
(14) Gear (Bl60313). (14) On handwheel (C53516B) by four screws (A147132) and washers (BEAX1H). (14) Remove screws and washers.
(15) Shaft (Bl60308). (15) Secured in bearing (A146556). (15) Drive out in same direction as step (12) above. Use a wood block against the end of the shaft to protect it.
(16) Cover (Bl60307). (16) Four screws (BCFX2FK) and washers (BECX1K). (16) Remove screws and washers.
(17) Bearings (A147134) and (A146556). (17) Forced into case (D26901). (17) Force out, using equal pressure all around the bearing.
(18) Gear (C53643) and spacer (A147130). — (18) Remove through bottom of case (D26901).
(19) Bracket (D26900). (19) Four screws (BCAX1EE), nuts (BBAX1E), and washers (BECX1M), and four screws (BCAX1EG) and washers (BECX1M). (19) Remove screws, nuts, and washer and lift the bracket out of its socket in the carriage. Shaft (B127798), its gears, and nuts should lift out with the bracket.
40
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 35
Part Means of support Method of removal
(20) Gear (C53642). (20) Nut (BBRX1AF) and washer (BEFX1AF). (20) Remove nut and washer.
(21) Gear (C53644). (21) Nut(BBRXlAE) and washer (BEFX1AE). (21) Remove nut and washer.
(22) Shaft (B127798). (22) Secured by bearings (A146715) and (A146724). (22) Drive out through either end.
(23) Bearings (A146715) and (A146724). (23) Forced into bracket (D26900). (23) Force out, using equal pressure all around the bearing.
(24) Case (D26806) with pinion and gears assembled. (24) Eleven screws (BCFX1EC) and four nuts (BBAX1E) and 11 washers (BECX1M). (24) Remove screws, nuts and washers and lift assembly from mount and disassemble as described in the following steps.
(25) Cover (C53514) and gasket (B127780). (25) Seven screws (BCFX2DG) and washers (BECX1G). (25) Remove screws and washers.
(26) Plate (B127779) and gasket (B127781). (26) Five screws (BCKX2CE) and washers (BEAX4E). (26) Remove screws and washers.
(27) Gear (C53645) and pinion (C53648). (27)Nut(BBRXlAF). Gear is splined to pinion and pinion secured in bearings (A147068). (27) Unscrew nut (BBRX1AF). Drive pinion down and out of gear and remove gear through upper hole and pinion through the lower hole of gear case (D26806).
(28) Bearings (A 147068) (28) Forced in gear case (D26806). (28) Force out, using equal pressure all around the bearing,
c. Assembly.—(1) Assemble in the reverse order of disassembly. Bearings must be set in their sockets evenly and in line so that when a shaft is put through them, the bearings will not be displaced. An even amount of pressure should be applied all around the bearing when assembling to a shaft or casing.
(2) Lubricate as specified in paragraph 51.
41
TM 9-1235
36
ORDNANCE MAINTENANCE
36. Traversing mechanism, M3 Al carriage (figs. 25 and 26).—a. Replacement of parts.—Backlash of over % turn of the handwheels, chattering gears, binding of the mechanism, or failure to traverse, will indicate necessity for repair or replacement of parts.
b. Disassembly.—The azimuth indicator must be removed and the hydraulic drive gear disconnected from the mechanism. Disassembly will be carried out in the following manner:
Part Means of support Method of removal
(1) Crank (C87039). (1) Secured to sleeve (B162129) by plunger (A148996). (1) Pull out plunger and lift crank from sleeve.
(2) Sleeve (B162129) with gear (A149004). (2) Secured to gear (B162130) by screws (BCGX1.1BC) and (A149006). (2) Remove screws in order given and pull off gear. Be prepared to catch balls and spring in gear and shaft.
(3) Gear (Bl62130). (3) Splined to shaft (C54535). (3) Pull from shaft.
(4) Cover (B162143). (4) Four screws (BCAX1CA) and washers (BECX1K). (4) Remove screws and washers.
(5) Shaft (C54535). (5) Secured in ball bearings (CABX3AG) and (CABX1AG) forced in housing (D42229). (5) Drive from housing.
(6) Bearings (CABX3AG) and (CABX1AG) and spacer (A149007). (6) Forced on shaft (C54535) and locked with nut (BBRX1AG) and washer (BEFX1 AG). (6) Remove nut and washer and force bearings from shaft using equal pressure all around bearings.
(7) Housing (D42229) and inclosed shaft (C54580), gear (C54566) and bearings(CABXl AG). (7) Six screws (BCAX1EC) and washers (BECX1M). (7) Remove screws and washers.
(8) Gear (C54566). (8) Splined to shaft (C54580) and locked with nut (BBRX1AF) and washer (BEFX1AF). (8) Remove nut and washer and force gear from shaft.
42
TM 9-1235
3 7-MM ANTIAIRCRAFT G.UN MATERIEL 36
Part Means of support Method of removal
(9) Shaft (C54580) with coupling (B162131). (9) Secured in bearings (CABX1AG). (9) Drive out in direction of coupling.
(10) Coupling (Bl62131) (outer half). (10) Splined to shaft (C54580) and locked with cotter pin (BFAX1DK). (10) Remove cotter pin and force from shaft.
(11) Bearings (CABX1AG). (11) Forced into housing (D42229). (11) Force from housing using equal pressure all around bearings.
(12) Housing (C54541) with inclosed pinion (C54549). (12) Four screws (BCAX1EC) and washers (BECX1M). (12) Remove screws and washers.
(13) Cover (B162144). (13) Four screws (BCAX1AA) and washers (BECX1G). (13) Remove screws and washers.
(14) Pinion (C54549). (14) Secured in bearings (CAAX1AM) and (CABX1AG) and locked with nut (BBRX1AG) and washer (BEFX1AG). (14) Remove nut and washer and drive pinion out of bearings.
(15) Bearings (CAAX1AM) and (CABX1AG). (15) Forced into housing (C54541). (15) Force out using equal pressure all around bearings.
(16) Housing (D42230) with inclosed shaft (C54576), gear (C54565) and gear (B162147). (16) Six screws (BCAX1ED) and washers (BECX1M). (16) Remo ve screws and washers.
(17) Coupling (B162131, inner half). (17) Splined to shaft (C54576) and locked with cotter pin (BFAX1DK). (17) Remove cotter pin and force from shaft.
(18) Gear (B162147). (18) Splined to shaft (C54576) and locked with nut (BBRX1AF) and washer (BEFX1AF). (18) Remove nut and washer and force gear from shaft.
43
TM 9-1235
36
ORDNANCE MAINTENANCE
1----
x-—Ku / \ i I GASKET-Al49084-- F II I
(S) (1--1-tl ‘ —AZIMUTH INDICA7
1 - II II___I COVER-B162143-1 ; || ,
|\. y I \\ SCREW-BCAXICAl | II if"—
i \\ WASHER-BFCX1K U
W/z xvK \\ TzLnf FITTINC-A21759I
[A AZL \\ JTET k A i A-—r fitting-cldxia
MB \\ Wuz±!prr
SCREW-BCAX1EC------, \\ // 7----HOUSINC-D42229
GASKET-Al 49089--it A_____// __,
SCREW-BCAX1 EC___ © U (J....4J 1 SHIM-A149I89
WASHER-BECX),MJ — ONE T(JRN OF HANDWHEEL I—ISCREW-BCAXI EC
FITTING-CLDXIA--- IQ FQR go TRAVErSE A |WASHER-BECX1M
HOUSINC-C54541-1 kJa___sk A__ faf r
GASKET AI49087_ VT-----K CASKET-A149088-jEEEEB ,-SCREW-BCAXICB
&ASKET-AI49087 FB 0 LWASHER-BECX1K
COVER- B162144 r ----COVER - B162141
---------------------------CASKET-A 149090 FsCREW-BCAXl ED SCREW-BCAX1AA_H -- XcirriNr rmvi* « /A WASHER-BECX1M
WASHER-BECX1C Tl-----IB FITTING-CLDXIA ID-----©1/ L
I Ct ---H°USINC-D42230 HQUS'NC-^215
pF | ~CASKET-A 149085-----------------1 T |pX^_$HIM-Al 49188
r I hT ' I Opc SCREW-BCAX1 EC~| /T | “ Y
^aa...CT...J U... CT J WASHER-BECX1M ["pmZZECT. | .©Wj-PLUC-CPMX1B
A--* RA PD 6501
Figure 25.—Traversing mechanism assembly, M3A1 carriage (sections shown in fig. 26).
FITTING-CLDXIA CRANK, ASS'Y-C87039-i FITTING-A217591
44
3 7-MM ANTIAIRCRAFT GUN MATERIEL
TM 9-1235
36
45
PIN BFDXICC---—y r SHAFT-C54535 /-SPACER-A 149007
CEAR-A149004--. \ \ .— BEARINC-CABXI AC QB. „ FTD
BALL-CCAX1B--\ \\ \ / / NUT-BBRXIAF |__Cap I
CEAR-B162I30-\ \ \\ B. . / WASHER-BEFX1 Af] -----CEAR-C54566
\n n\_ \\ y—~L>-----bearinc-Cabxiac
r X :i^rT~RXM-f-UTAaN. \ M SHAFT-C54580 fe—M" y---COUPLINC-B162131
CREW-A149006 | |||^J|j I M PIN-BFAXIDK ——X SHAFT-C54576
| lr/ ~—'''/f7 DISC-A149010 ,---- BEARINC-CAAX1 AM
SCREW-BCCX1.1BC / / / LXZ-ji x Tnt NUT BBRX1AC I c 1*$''' a /
/ / / 7==* O MZaSz NUT-BBRXIAG ----d yr b / -------SLEEVE-A149130
SPRINC-A149005-' / / / S cfatiam r r WASHER-BEFX1 AC
/ / / y SECTION B-B -I I-- PINION-C54549
SLEEVE-Bl62129-' / BEARINC-CABX3AG ™ RETAINER-A149182-z _
' FnUT-BBRXIAC CEAR-C54565 ---'[J .,^,0,
-----luMcucn crtvi e hi TU?"—=®V---PACKINC-A149183 [WASHER-BEFXl AC SLEEVE-AI49173 -- \
I 1 : \ _------- 7~..I HJ H \ [NUT-BBRXIAC
/chrV\ /// BEARINC-CAAX1AM [WASHER-BEFX1AC
) CEAR-B162147 - riL__rJNy\^ NUT-BBRXIAF
PIN-BFDX2CE-----NUT-BBRXIAF "I_________________________________________l_I |WASHER-BEFX1 AF
WASHER-BEFX1AF] CEAR-C54548
/ Ml ! Z—N vi'feoz BEAR I NC-A 147068---------PINION-C54550
X l'V\\ SECTION A-A
---------
SECTION C-C
------------------RA PD 6507
Figure 26.—Traversing mechanism sections, M3A1 carriage (sections pertain to fig. 25).
TM 9-1235
36-37
ORDNANCE MAINTENANCE
Part Means of support Method of removal
(19) Shaft (C54576) and sleeve (A149173). (19) Secured in bearings (CABX1AG) and (CAAX1AM), gear (C54565) and locked with nut (BBRX1AG) and washer (BEFX1AG). (19) Remove nut and washer and force shaft down and out of gear and bearings and pick gear and sleeve out of housing.
(20) Bearings (CABX1AG) and (CAAX1AM). (20) Forced into housing (D42230). (20) Force out using equal pressure all around bearings.
(21) Housing (D42215) with inclosed pinion (C54550) and gear (C54548). (21) Six screws (BCAX1EC) and washers (BECX1M). (21) Remove screws and washers.
(22) Pinion (C54550) and gear (C54548). (22) Secured in bearings (A147068) and locked with nut (BBRX1AF) and washer (BEFX1AF). (22) Remove nut and washer and drive pinion down and out of gear and bearings.
(23) Bearings (A147068). (23) Forced into housing (D42215). (23) Force out of housing using equal pressure all around bearings.
c. Assembly.—Assemble in the reverse order of disassembly. Bearings must be set in their sockets evenly and in line so that when a shaft is put through them, the bearings will not be displaced.
37. Elevating mechanism, M3 and M3E1 carriage (figs. 27, 28, and 29).—a. Replacement of parts.—Backlash of over 14 turn of the handwheels, chattering gears, binding of the mechanism or failure to elevate, will indicate necessity for repair or replacement of parts.
46
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 37
b. Disassembly.—Remove the gun and cradle from the carriage and disassemble in the following manner:
Part Means of support Method of removal
(1) Case (C53684), case (D26907), brackets (D26908) and (C53639), and inclosed parts. (1) Four screws (BCAX1ED), nuts (BBAX1E) and washers (BECX1M) and four screws (BCAX1EC) and washers. (1) Remove screws, nuts and washers and lift assembly to a convenient place to permits its disassembly.
(2) Cover (Bl 60237) with gear (Bl60220) and bearings (A146723) and (A146725). (2) Four screws (BCAX1CA) and washers (BECX1K). (2) Remove screws and washers.
(3) Gear (Bl60220) (3) Nut (BBRX1AF) and washer. (3) Unscrew nut and drive out.
(4) Bearings (A146723) and (A146725). (4) Forced in cover (Bl 60237). (4) Force out using equal pressure all around the bearing.
(5) The balance of the upper portion of this gear case will be disassembled in the same manner as the traversing gear case (par. 35).
(6) Gear (Bl60235) (6) Splined to shaft. (6) Pull from the shaft.
(7) Cover (Bl27797). (7) Six screws (BCAX3A) and washers (BECX1G). (7) Remove screws and washers.
(8) Cover (C53522). (8) Six screws (BCAX3A) and washers (BECX1G). (8) Remove screws and washers.
(9) Case (D26907), stops (B127795) and (B127796), and dog (Bl 27794). (9) Four screws (BCAX1EF), nuts (BBAX1E) and washers (BECX1M), taper pins (BFCX1FK), and keys (A20239). (9) Drive out taper pins from stops; spin the dog to its maximum height; remove screws, nuts and washers from case; raise case high enough to force stops off keys; remove upper key and spin dog off threaded portion of shaft and lift case free of shaft, picking off stops and dog.
47
TM 9-1235
37
ORDNANCE MAINTENANCE
Part Means of support Method of removal
(10) Bearing (A146724). (10) Forced in case (D26907). (10) Force out using equal pressure all around the bearing.
(11) Bracket (D26908). (11) One screw (BCAX1ED), four nuts (BBAX1E) and washer (BECX1M) and three screws (BCAX1EF), nuts (BBAX1E) and washers (BECX1M). (11) Remove screws, nuts and washers and lift bracket off, up over shaft.
(12) Cover (C53538). (12) Four screws (BCAX3AB) and washers (BEAX3B). (12) Remove screws and washers.
(13) Guard (A146586). (13) Two screws (BCNX2AC) and washers (BEAX1F). (13) Remove screws and washers.
(14) Shaft (C53646) and gear (Bl60233). (14) Nut (BBRX1AF) on lower end of shaft. (14) Remove nut (BBRX1AF) and washer. Drive shaft up, out of gear and bearing, catching gear as shaft is driven out.
(15) Stud (A 146713). (15) Screwed in shaft (Bl 60232) and locked with screw (BCFX2AC). (15) Remove lock screw and unscrew.
(16) Gear (B160231). (16) Splined to shaft (B160232). (16) Pull from the shaft.
(17) Shaft (Bl60232). (17) Secured in bearings (A146715). (17) Drive out.
(18) Bearings (A146715). (18) Forced in case (C53639). (18) Force out using equal pressure all around the bearings.
(19) Worm housing (D26795) and inclosed worm (B127646), shaft (B160223) and gear (B160230). (19) Four screws (BCAX1ED) and washers (BECX1M). (19) Cradle must either be removed or raised sufficiently high to have elevating rack clear worm. Remove screws and washers.
48
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 37
ONE TURN OF HAND WHEEL FOR 11°25‘ ELEVATION
CUARD-A146586
WASHER-BEAX3B|
FITTING-CLDX1 A-i
COVER-C53522
PIN-BFDX2AA
MUZZLE
COVER-B127773
GUARD-Bl 27868
SCREW-BCAX3B
WASHER-BEAX3B
SCREW-BCAX3K
WASHER-BEAX3A
SCREW-BCAX3A-] WASHER-BECXlF
HOUSING-D26795
SHIM-A146870
SCREW-BCAXIED]
WASHER-BECX1 M|
SHIM-A146869-
PLUG. PIPE 'A BRASS FITTING-CLDX1A PLUC-Q52B SCREW-BCAX3A WASHER-BECX1G COVER-B127797 CASK ET-A147481
PLUG, PIPE 'A BRASS---
COVER-053538——>
<1 OF TRUNNIONS SCREW-BCAX1ED NUT-BBAXIE WASHER-BECX1_M SCREW-BCNX2AC WASHER-BEAX1F
RA PD 6526
Figure 27.—Elevating gear case assembly, M3 and M3E1 carriage (sections shown in figs. 28 and 29).
465292°—42---4
49
TM 9-1235
37
ORDNANCE MAINTENANCE
31 33 354WIW-36
30—-—32 I 34k’IMI ' 37 CT
26 25 —* - 43 42 >
i Knm iS^^-^Fr2 JXF ut ---46 10
i 50 * i
io \ AtvcXuB si > 1
B5V77V ul 9 J H ziSF >1 ^3 2 y
\ /tt i V -52 •- d
vl I 8-V iWwl-----------53 = rn s
14 13,2 7 \ AO^Oft----54 - I — l|'
15 6-y
Utrfe S6 “czQ
5W\\t” ® \ l\ \-l—« I
\ \\ \ \ y\ 9
\ U \ \ N '--59
5—WO VWi KWn \ c-*—' - 60
4 —\ 61
2----T^sSibv “ F62
1—
SECTION A-A-A RA pD
Figure 28.—Elevating gear case section, M3 and M3E1 carriages (sections pertain to fig. 27).
50
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 37
(Nut, BBRX1AF
| Washer, BEFX1AF
2—Gear, Bl60233
3—Gasket, B127897
4—Case, C53639
(Screw, BCAX1EF
5—J Washer, BECX1M (Nut, BBAX1E
6—Key, A20239
7—Gear, B160236
8—Shaft, B160309
9—-Spacer, A147131
10—Gasket, A147141 (Case, C53684
11 {Plug, Q52A
12—Handwheel, C53515A
13—Spindle, A26256
14—Knob, A11644
15—Washer, A26257
If—Gasket, A147140
17—
Cover, B160315
Screw, BCKX2CF
Screw, BCFX2DG
Washer, BECX1G 18—Plug, Q52A
( Screw, A147139 ly {Washer, BE AXIL 20—Gear, B160317 21—Gear, B160310 22—Screw, A147133 23—Screw, BCFX2BB 24—Shaft, B160311
25—Bearing, A147134
26—Shim, A147137
27—Shaft, A147136
28—Bearing, A147135
29—Gear, B160314
{Case, Bl60316 Screw, BCAX1CA Washer, BEAX1L Fitting, CLDX1A Pin, BFDX2AA
31—Pin, BFAX1BE 32—Cover, Bl60237 33—Shim, Bl27846 34—Bearing, A146725 35—Gear, B160220 36—Spacer, A146726 37—Bearing, A146723 „„ (Screw, BCAX1CA
{Washer, BECX1K 39—Handwheel, C53516A 40—Pin, BFDX2BB 41—Gear, Bl60234 42—Ball, CCAX1B 43—Spring, FAAX1C .. (Screw, A147132 44— 7
{Washer, BEAX1H 45—Bearing, A146556 46—Gear, £160313
__JScrew, BCFX2FK
{Washer, BECX1K 48—Cover, Bl60307 49—Gear, Bl 60235 50—Bearing, A146724 51—Stop, B127795 52—Case, D26907 53—Dog, Bl27794 54—Stop, B127796 55—Pin, BFCX1FK 56—Pin, BFDX2CC 57—Bracket, D26908 58—Shaft, C53646 59—Shim, A146867 60—Screw, BCAX1ED 61—Bearing, A146715 62—Shaft, Bl60232
51
TM 9-1235
37
ORDNANCE MAINTENANCE
SCREW-BCAX1 Ecl WASHER-BECXIM]
FITTING-CLDX1C
WASHER-BEFX1AG
SPACER-Al 47066
SHIM-A146868
GEAR-B16023I
BEARINC-A146715
SCREW-BCFX2AC
STUD-A1467I3
CASKET-AI47480
NUT-A147064
BEARING-A146790
SHAFT-B160223
GEAR-B160230
SPACER-A147062
NUT-A147063
COVER-B160222
FITTING-CLDX1A
PIN-BFDX2CC
SH1M-A148872
PIN-BFAX2AA
SECTION B-B
WORM-B127646
SCREW-BCAX3A
WASHER-BEAX3A
RA PD 7598
Figure 29.—Elevating gear case section, M3 and M3E1 carriages (sections pertain to fig. 27).
Part Means of support Method of removal
(20) Cover (Bl60222). (20) Four screws (BCAX3A) and washers (BEAX3A). (20) Remove screws and washers.
(21) Cover (B127773). (21) Six screws (BCAX3K) and washers (BEAX3A). (21) Remove screws and washers.
(22) Nut (A147064). (22) Screwed on shaft (Bl60223) and locked with washer (BEFX1AG). (22) Straighten prong of lock washer, unscrew nut and remove lock washer.
(23) Shaft (Bl60223) with gear (Bl60230). (23) Splined to worm (B127646) and secured in bearing (A146790). (23) Drive out in direction of gear and pick worm and spacer out of housing.
(24) Gear (Bl60230) and bearing (A146790). (24) Nut (A147063) and cotter pin, and splined and forced to shaft (Bl60223). (24) Remove cotter pin and nut. Pull gear from shaft.
(25) Outer cones of bearings (A146790). (25) Forced in housing (D26795). (25) Force out, using equal pressure all around cone.
52
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 37-38
c. Assembly.— (1) Assemble in the reverse order of disassembly. Bearings must be set in their sockets evenly and in line so that when a shaft is put through them, the bearings will not be displaced.
(2) Stops (B127795) and (B127796) and dog (B127794) must be placed in position on the shaft (C53646) at the same time that the assembled gear case (D26907) is put into position. Secure the stops to the shaft by means of the taper pins and keys in one of the keyways of each stop. Rotate the dog to its lowest position on the shaft. Assemble cover (C53522) to the case so that the stud of the dog will fit into the socket in the cover. Replace the cradle temporarily on the carriage at 0° elevation. Operate the elevating mechanism to check the operation of the dog and stops with relation to the movement of the cradle. Adjustment is possible by removing cover (C53522) and turning the dog on the shaft or by using a different keyway in one or both of the stops. It may be found necessary to cut new holes in the shaft for the taper pins that pass through the stops. Before replacing the cradle, set the dog in its lowest position and then put the cradle on the carriage at 0° elevation. The dog can then rise through its maximum range when the cradle is elevated to 85°. When the stop mechanism is properly adjusted, the covers should be replaced and the cradle secured at the trunnions.
(3) Lubricate as specified in paragraph 51.
38. Elevating mechanism M3 Al carriage (figs. 30 and 31.) — a. Replacement of parts.—Backlash of over *4 tnrn of the handwheels, chattering gears, binding of the mechanism, or failure to traverse, indicate that repair or replacement of parts is necessary.
b. Disassembly.—Disconnect the hydraulic drive gear from the mechanism and remove the gun and cradle. Disassembly will be carried out in the following manner:
Part Means of support Method of removal
(1) Crank assembly (C87039). (1) Secured to sleeve (Bl 62129) by plunger (A148996). (1) Pull out plunger and lift crank from sleeve.
(2) Housing (D42233) with inclosed parts. (2) Four screws (BCAX1EC) and washers (BECX1M). (2) Remove screws and washers.
(3) Sleeve (Bl62129) with gear (A149004). (3) Secured to gear (Bl 62130) by screws (BCGX1.1BC) and (A149006). (3) Remove screws in order given and pull from gear. Be prepared to catch balls and spring.
53
TM 9-1235
38
ORDNANCE MAINTENANCE
Part Means of support Method of removal
(4) Gear (Bl62130). (4) Splined to shaft (B162213). (4) Pull from shaft.
(5) Cover (B162143). (5) Four screws (BCAX1CB) and washers (BECX1K). (5) Remove screws and washers.
(6) Cover (B162220). (6) Eight screws (BCCX1AS) and washers (BEAX1H). (6) Remove screws and washers.
(7) Gear (C54563) and spacer (A149153). (7) Splined to shaft (B162212) and locked with nut (BBRX1AF) and washer (BEFX1AF). (7) Remove nut and washer and force gear and spacer from shaft.
(8) Shaft (Bl62212) and pinion (C54545). (8) Secured in bearings (CABX1AG) and (CAAXlAM)and locked with nut (BBRX1AF) and washer (BEFX1AF). (8) Remove nut and washer and drive shaft out of gear and bearings.
(9) Shaft (B162213) and gear (C54546). (9) Secured in bearings (CABX1AG) and (CABX3AG) and locked with nuts (BBRX1AF) and (BBRX1AG) washers (BEFX1AF) and (BEFX1AG). (9) Remove nuts and washers and drive shaft out of gear and bearings. Drive toward bearing (CABX3AG).
(10) Bearings (CABX1AG), (CABX3AG), and (CAAX1AM). (10) Forced into housing (D42233). (10) Force out of housing using equal pressure all around bearings.
(11) Housing (D42232) with inclosed parts. (11) Six screws (BCAX1DC) and washers (BECX1L). (11) Remove screws and washers.
(12) Housing (C54542) with inclosed gear (B162146) and shaft (B162210). (12) Four screws (BCAX1DC) and washers (BECX1L). (12) Remove screws and washers.
(13) Cover (B162218). (13) Eight screws I (BCCX1AS) and wash-1 ers (BEAX1H). (13) Remove screws and washers.
54
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 38
f
muzzle
ZF // screw] FXtcFi _____
rJ Z7 1>l^ // BCCXL,BA\KhA [screw / F
AMoi’Ski '■ /x i to // screw] rBcAx,Dc hb Ai
A,49'91T\ __IF /U~V // BCAX1EC / LwMAK ■ WASHER X
-] I A l\ WASHER A / \ [BECX1L TiT
BCAX'EtoWRFF to /j \ L U
JAMA-A FiWNG-CLDXIA-l WjLL dllj> JrA n
d I n=L=. see note Ji H PS 1 (ff k
i__ii:jA=i===^ p- PLUG-CPMXIB j
|j j i j_Ace opj H -----
I A,J / COUPLINGfT -'\\ ---
F=^^^=^---^==---^-—. f=^-=^=J=^_---, Lb_______|__Fzli----LFf"'
/ r------------:----;------■'—
1---------____________________________________________________
ONE TURN OF HANDWHEEL COUNTER
CLOCKWISE ELEVATES GUN 4-2/3°
RA PD 6822
Figure 30.—Elevating mechanism assembly, M3A1 carriage (sections shown in fig. 31).
55
TM 9-1235
38
ORDNANCE MAINTENANCE
LOCKWASHER-BECX1K ---, -----BFARING-CABX3AG COVER-B162211 -n HOUSING-D42232
COVER-B162143 ------1 SPACER-A149148...gEAR|NC.CABXiAC -- 7 J//X-AyL SECTION B-B
PIN-BFDX1CG-------\ /FAf________r SCREW-BCCX1 AS —d / / I f'f \
BALL-CCAX1B-------______________________> LLOCKWASHER-BEAX1H J B // X
n [WOT? APTXUW A \\ ■— GEAR-C54546 jlESS---
Ip!?'- I f p______. ---- LOCKWASHER-BEFXIAF Jp _ ' ------GASKET-A149I90
SCREW-A149006-fgeSi:; —II . ---SHAFT-B162213 ', FFeJX-t ~ -------------------- WASHER-A149I52
t? pj AjL Xf ~ —— 3x\\\ LOCKNUT-BBRXI AF ; /.-.■■/ /j / . p^-- - - Al-----COVER Bl 62142
SPRINC-A 149005 -C TT xVNXT C0VER'6162220 F 1 <’ I _ ___ COVER-B16212
SLEEVE-6162129-U-— CASKET-6162219 I- ; M I i- - - -~t7 V-----------------r NUT-B6HX2B
GEAR-6162130------ AH--------------A------ PINION-C54545 ® L PIN-BFAX2CD
CEAR-AI49004------- R 7------------------- HOUSING-D42233 \\A&/h2-------- WORMWHEEL Bl62217
SCREW-BCAX1CB-------- | ---t SHAFT-B 1622p CASKET-A149181^17 I i----HOUSING-D42231
LOCKNUT-BBRX1 AG-----1 J; __ (At Z"/V F SPACER-A149144 Mj ------ SPACER-A149127
GASKET-A '49084 --AA3 // - A^'^MECHANISM, ELEVATING, SECTIONS
LOCKWASHER-BEFX1AG ---- ।-----C K. Jr -------------------------
ocAoikir riAYiAM_____ J |-----SHAFT-C54577-1 rSPACER-A149146
BEARING-CAAX1AM ____ Fl B—Nk/Z/Z/y^T^C --------CEAR-B162145
SPACER-A149153 ______।---------------------------------------------------------BEARING-CAAX3AF
CEAR-C54563-----------— SECTION C-C I-------- ---SPACER-A149147
----------- I-----AlfiP L V— iHi IjjPSl r NUT-A2176II GASKET-B162221-1 | -L PIN-BFAX2AB
NIJT-A149154 p i CAP-A149128
PIN-BFAX2AA -1 5 AA/xC gjT W T SCREW-BCCX1 AR
COVER-6162218----- 0^/7/ \ MA A iff? \ L WASHER-6EAX1H
PINION-C54562 H ,/ ggVSSS | HI F ----SHAFT-6162210
SPACER-A149150 ------(--J/'H ---- PACKING-A149143
SHIM-6162222 --------\ / / p*IH WN r NUT-86RX1AG
SCREW-A149202 —।_____ArZ A/ \ \ L WASHER-BEFX1 AG
WASHER-BECX1M-1 \ \T-----COVER-A149129
WORM-6162253---------- X -tYl----GASKET-A149151
BEAR ING-A146790-*
SECTION A-A ...omc ______J HOUSING-C54542
--------- CAP-A149025 I------------PLUG-CPMX1B
BEARING-CAAX1 AM -----------------GEAR-8162146 RA PD 6504
Figure 31.—Elevating gear case sections, M3A1 carriage (sections pertain to fig. 30).
56
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 38
Part Means of support Method of removal
(14) Nut (A149154). (14) Screwed to shaft (C54577) and locked with pin (BFAX2AA). (14) Remove cotter pin and unscrew.
(15) Pinion (C54562) and spacer (A149150). (15) Splined to shaft (C54577). (15) Pull from shaft.
(16) Cap (A149128). (16) Four screws (BCCX1AR) and washers (BEAX1H). (16) Remove screws and washers.
(17) Nut (A217611). (17) Screwed to shaft (C54577) and locked with pin (BFAX2AB). (17) Remove cotter pin and unscrew.
(18) Shaft (C54577), worm (B162253), spacers (A149144), (A149146), and A149147) and gear (B162145). (18) Secured in bearings (A146790) and (CAAX3AF) and gear and worm splined to shaft. (18) Drive shaft to the left out of bearings, worm and gear, and remove parts through openings of housing.
(19) Bearings (A146790) and (CAAX3AF). (19) Forced into housing (D42232) and on shaft (C54577). (19) Force bearings out of housing and off shaft, using equal pressure all around bearing.
(20) Cap (A149025) and cover (A149129). (20) Eight screws (BCCX1AS) and washers (BEAX1H). (20) Remove screws and washers.
(21) Shaft (B162210) and gear (B162146). (21) Secured in bearings (CAAX1AM), locked with nuts (BBRX1AG) and washers (BEFX1AG) and gear splined to shaft. (21) Drive shaft out of bearings and gear.
(22) Bearings (CAAX1AM). (22) Forced into housing (C54542). (22) Force out of housing using equal pressure all around bearings.
(23) Housing (D42231) with inclosed wormwheel (Bl62217) and pinion (C54547). (23) Six screws (A 149202) and washers (BECX1M). (23) Remove screws and washers.
57
TM 9-1235
38-39
ORDNANCE MAINTENANCE
Part Means of support Method of removal
(24) Cover (B162211). (24) Screwed into housing (D42231). (24) Unscrew.
(25) Cover (B162142). (25) Seven screws (BCCX1AS) and washers (BEAX1H). (25) Remove screws and washers.
(26) Wormwheel (Bl62217) and spacer (A149127). (26) Splined to pinion (C54547) and locked with nut (BBHX2B), washer (A149152) and pin (BFAX2CD). (26) Remove cotter pin, nut, and washer and drive pinion out of worm, spacer, and housing.
c. Assembly.—Assemble in the reverse order of disassembly. Bearings must be set in their sockets evenly and in line so that when the shafts are put through them, the bearings will not be displaced.
39. Foot-firing mechanism, M3 carriage (fig. 32).—a. Footfiring mechanism does not have sufficient travel to fire the gun.—This is usually caused by a bent trigger bar. If it is necessary to change the gun, replacing it with a gun other than the one issued in the mount, it will be necessary to adjust the motion of the foot-firing mechanism to the trigger of the new gun. This adjustment can be made by backing off on nut (BBFX1E) on the vertical shaft of the foot-firing mechanism. After the linkage has been adjusted so the gun will fire, the foot-firing pedal must be checked to see that the pedal lock does not lock the pedal in firing position. If this should occur, it will be necessary to build up with welding metal the link of the foot-firing mechanism which bears against the trigger bar until a proper adjustment is possible.
b. Foot-firing pedal lock sticks and is hard to disengage.—The clearance between the latch pin and its socket is rather close in a new mount. If not well lubricated, the pin may bind and be very hard to disengage. In extreme cases, or if the rod has been permitted to rust while the mount was in transit, it may be necessary to work the rod down with fine emery cloth. Clean and lubricate with oil, SAE 10.
c. Excessive play in the foot-firing pedad.—It may be possible to depress the firing pedal (C53755) so that the plunger (A147311) catches under its seat behind pedal (C53756). This, in effect, locks the firing mechanism in the open position so that the gun will continue to fire until the ammunition is exhausted. The pedal (C53756) has been modified on materiel under production so that the protrusion
58
TM 9-1235
39
3 7-MM ANTIAIRCRAFT
GUN MATERIEL
WASHER-BEBX1G SCREW-A146740
SPIN-BFAX1BD
NUT-BBEX1A
END, ROD-A146767 [SCREW-Al 46804
PIN-BFCX1BB ,-J PIN-BFAX1 BD
RODA147304 JnUT-BBEXIA
SCREW-BCUX1EH
A OF TRUNNIONS
LINK-A147302 -L r 13/32 MOVEMENT TO PERMIT FIRING
LINK-A147303 \ \ |T [ p-1 i-[nuT-BBEXIA
--\\\ -- I PIN-BFAXIBD r- ' ~
BCAXICCll _ /J AA-SPRING-A146805 TD1
^-becxik|~~| 3 iiLcHfxA 0F TRUNNI0NS
-- ■ -ROD-AI46784 ,aMJzy \ I [NOTE: adjust this distance to the CK-BI62506-AAA □A \ [CORRECT LENGTH TO PERMIT FIRING.
DAL-C53756 /Ah'/<3>A \
IAFT-B160511 -FITTING-CLDX1A
N-BFCX1HG I CZ'V
DAL-C53755 i --------
LA
SCREW-BCAX1ED1 / SPRING-A14731 0 PLUNGER-A14731J .
WASHER-BECXlMl SECTION B-B ra pd 65Z4
Figure 32,—Foot-firing mechanism assembly, M3 and M3E1 carriages.
59
TM 9-1235
39
ORDNANCE MAINTENANCE
TRUNNION CABLE
CABLE PEDAL
RIGHT REST
AI49II6
REAR
HOUSING D423O8
RA PD 23869
SHAFT AI49I39
Figure 33.—Foot-firing mechanism, M3A1 carriage.
(SHOWN 90° OUT OF
POSITION
PEDAL
PLUNGER A2I7673
FRONT CABLE PEDAL
PIM
BFCXIBB
PIN AI49II9
CLEVIS
CABLE ADJUSTING SCREW SCREW-.BCTX2K CABLE BI624I4 • CABLE BI62439
MECHANISM CHANGE LEVER
60
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 39-40
beneath the hole in which the plunger fits has been increased in length from 1 inch to 1^ inches. This dimension is from the center of the hole to the outer edge of the protrusion. If a new pedal with these dimensions cannot be obtained, the old one can be modified by building up the additional half inch required on the protrusion by means of welding.
TURNBUCKLE A2I7660
COVER A2I7652
SHAFT A2I7656
CAM DI62202
CABLE
BI624I4
PLUNGER A2I7655
LEVER BI624II
COVER BI62408
NUT BBBXIA
PIN BFDX2AA
SCREW BCAXIAC
P N BFCX AC
COVER BI624I0
RAPD 23870
PIN A2I7567
34.—Disassembly of foot-firing mechanism housing, M3A1 carriage.
Figure
CABLE , BI62439
NUT
BBAX A
COTTER PIN BFAXIBE
SPRINGS ■ AI49II3
PIN BFDX2AA
NUT BBBXIA
PIN BFDX2AA
LEVIS A2I7647
COVER
BI62409
SHAFT A2I7657
COLLAR A2I7649
HOUSING D42308
40. Foot-firing mechanism, M3A1 carriage (figs. 33 and 34) .— a. Replacement of foot cables.—(1) To detach front end of cable (B162439)—
(a) Loosen setscrew (BCTX2K).
(£) Remove taper pin (BFCX1BB).
(c) Remove pin (A149119).
(tZ) Unscrew clevis (A149116) and nut from cable.
(e) Withdraw cable from bracket.
(2) To detach upper end of cable (B162414) —
(F^ ML ---FITTINC-CLDX1A
WASHER-BECX1 COVER-B127745-
NUT-A146668 —SHIELD-6127 743------------------------------------pZZZZ
^5° SCREW-BCKX2AC j"COVER-B127738
I / \ J '—CUP-CLFX2H
FITTINC-CLDXIbJ / \ JU K 1 1 J '' /J 1UBE-A146694
/ xlffl 1 k m Z at-------CASE-D26783
NIPPLE-A146655—' / 1 t NUT-C53492
/ 1 b /—HAND WHEEL-C53634 (FOR 37 MM M3 & T2 & M3E1)
r—BEARING-C8751 / fscREW-C87031 (FOR 37 MM M3A1)
\ NUT-BBRX1AC—, // SCREW-C53490 (FOR 37 MM M3 & T2 & M3E1)
\ WASHER-BEFXIAG-A // u rpcxicf
\ PIN-AI46994 (FOR 37 MM M3
---* f/ E"
A s > I Jtl § 2
.....fl y 5n
jF WSF X g s
jf •+’ W X. X
f ' ' W W o ft |
I -• I • « B I
f m 11 wmjw
1 * 1L • I \x X J J " \ J p e i a
1111 i s i — bps?
Figure 40.—Secondary shoe adjustment, lever type electric brake.
the adjusting wheel until a slight drag is felt and then backing off until the wheel is free. The anchor adjustment should not be disturbed after the brakes are in service except when new brake linings are installed. This is extremely important.
46. Disk type of brakes.—a. Armature spacing (fig. 44).— (1) The armatures should be depressed approximately %2 inch against the magnet when the drum is mounted in running position. This measurement can be determined by a special armature gage before the drum is placed on the axle.
72
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 46
ANCHOR ADJUSTMENT
tSTABHSHES come? CltARANCE I'
HHWHN LINING ANO S8UM, MIOWAY ‘
BETWtSN ANCHOR ANO ECCfNTKIC V
jr JF. . ^In. %‘s,
- '" ' tL A
/ * ^L. '
/ *’ z - v ■ \
/a®,'5 eX
sF • X Vi
' *.'--'"w • X I 1
,^w>Ww *: t JB • 1 I '
I * i^oB« i - J I
m < ,J W - /
* wFubK •/ . 11
\ ▼ JXwPWt •• f-r}
TURN FORWARD 7 . ~
.#■<; S*1***^ TO DECREASE / ' ’ ■ * ‘ "I - ' ' '' T
.^r*W^‘-'Z^ CLEARANCE Wl|PiW^ W X
VF ^0»WAS») |
I $HO£
| ADJUSTER |
lUI ADJUSTER OPENING W IN SACKING PLATE “
Figure 43.—Adjuster opening in back plate, lever type electric brake.
74
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 46
(2) Remove the disk and rim wheel from the wheel spindle. Remove the spindle inner taper roller bearing from the wheel spindle and place it in its correct position in the hub.
(3) Place the short end of the gage against the magnet face (fig. 44).
(4) Slide adjustable rod against the bearing seat at A.
(5) Tighten gage thumbscrew.
(6) Slide collar against the spacer gage frame.
(7) Tighten collar thumbscrew.
(8) Loosen gage thumbscrew.
(9) At three places on the armature circumference, wedge the armature away from the brake drum to its full travel.
DRUM
GAGE THUMB SCREW
BEARING SHOULDER
ARMATURE
ARMATURE AND BEARING ASSEMBLY
COLLAR THUMB SCREW—
WEDGE BLOCKS
BEARING SEAT
ADJUSTABLE ROD
MAGNET FACE
FACE
BRAKE AND AXLE ASSEMBLY RA PD 2996
Figure 44.—Armature gage for disk type electric brake.
(10) Place the long legs of the gage against the face of the armature.
(11) Slide the adjustable rod against the bearing shoulder.
(12) Tighten the gage thumbscrew.
The distance D from collar to gage is the armature depression after assembly. If this is greater than %2 inch, shim bearing out at bearing seat A. If it is under i/8 inch, then shim out the armature at B.
(13) If instructions have been carefully followed, armatures will be depressed approximately % inch against the magnet when the drum is mounted in running position.
Caution.—When the spindle has a grease retainer that slips on the spindle back of the bearing, be sure the retainer is in place before checking the armature depression.
75
TH 9-1235
46
ORDNANCE MAINTENANCE
b. Assembly of brake.—(1) In assembling do not allow grease, however slight the amount, to touch any part of the brake. Grease will cause grabbing, locking, or loss of power.
(2) When the drum is placed in running position, the wheel nut must be pulled up snug to prevent loose bearings. The brake loses power if the armature is not kept firmly in contact with the magnet. When new brakes are installed the vehicle should be given a small amount (about 5 miles) of road travel, using the brakes frequently until they work satisfactorily. After the brakes are wet, several applications while traveling are required to dry out the linings and
SPRING ~~---------
ARMATURE .........
ELECTRO MAGNET----
CAM LEVER—--------
BRAKE BAND—.'.....
SPRING--------—
BRAKE DRUM-—.....
RA PSD 952
Figure 45.-—Disk type electric brakes.
facing. Figure 22 shows a wiring diagram for the prime mover for proper operation of the brakes.
c. Glazed magnet facing.—This condition is caused by weak electric current in the brake circuit, light brake applications or grease or oil on the magnet facing. A magnet having a glazed or polished surface does not have sufficient friction to operate the brakes satisfactorily. To remedy cases of this kind, place the magnet in a lathe and turn about .005 inch to .008 inch off the magnet facing. The glazed surface may also be removed with a medium grade of emery cloth. Do not remove metal from pole faces of magnet. A new armature may be used with an old magnet but a new magnet must not be used with an old armature.
76
TM 9-1235
46
3 7-MM ANTIAIRCRAFT GUN
MATERIEL
5'BUOD WHEEL CO,R.H CAP NUT — 3700 / /
5-BUOD WHEEL CO..LH CAP NUT-370aaJ^^- //
MODIFY TO AGREE WITH-AI46880""| jj // ™ „
5-BUDD WHEEL CO.,RHSTUD-I2247E_iZX' |l BUDDWHEEL COL NUT 13332'E
5'mOO?FY Th MREE WlV^-AI 46880 " ~~-—-----------------AXLE CO,HUB FR0NT-A-333-J-270
2-“S-TD0ETR0fT aTe CO.hKp NO 262-1.-50-r^W^:::^:^^^^===2-TIMKEN-DETR0,T ““ C^.X!I’ . «
“ |>w4—------------------------2-TIMKEN-DETROIT AXLE CO,BUSHING NO I225-N-248
--- 1 ---------------2-TIMKEN-DETROIT AXLE CO,RETAINER-I2O5-H-I64
;• Iff.J | - > i ----2-TIMKEN-DETROIT AXLE C0..SPACER-I244-W-75
rorj // I TIMKEN-DETROIT AXLE CO..PIN NO 7X6,7X9 ft 7X10
2-TIMKEN-DETROIT AXLE CO HUB CAP N0.3262-A-27—‘-4@ CT 1—To BE USED AS REQUIRED.
USED ON CARRIAGES NO. I TO 121. fiTl! -----------2-TIMKEN-OETROIT AXLEi CO.,BUSHING NO.I225" N-248
2-TIMKEN-BEARING CO,CONE 1779,CUPI729--- D A. l~JkUl \_______________[F TIMKEN-DETROIT AXLE CO, KNUCKLE N0.3III-Z-572R.
2-TIMKEN-BEARING CO,CONE 3382,CUP 3320 -_- Ifjl --"" ’otK |r.TIMKEN-DETROIT AXLE CO..KNUCKLE N0.3III-A-573 L.
|-I6 NC-2 TAP, 1 DEEP-2 HOLES AT ASSEMBLY-- I I // / ———2' TIMKEN BEARING CO,THRUST BEARING T-II3
8 II —--CP-—2-TIMKEN-DETROIT AXLE CO..PIN,STEERING KNUCKLE 3KM-B-54
Xy । j£t-----------2-TIMKEN-DETROIT AXLE CO,PART NO I250-L-36
\ f R.PD 2 3 908
Figuke 46.—Front wheel hub assembly.
77
TM 9-1235
46
ORDNANCE MAINTENANCE
2-TIMKEN-DETROIT AXLE CO. CAP HUB-3262-A-27_ _2-TIMKEN-DETROIT AXLE CO HUB-A-333-J-270
USED ON CARRIAGES NO. 1 to 121
__[F-BUDD WHEEL CO. R.H. STUD-12247-E
2-TIMKEN BEARING CO. CONE 1779, CUP 1729—1 5-BUDD WHEEL CO. L.H. STUD-12248-E
2 URFD ^^CARr'iACF^AFTFR Ncf' iTaND REPLACEMENTS [7-BUDD WHEEL CO. R.H. NUT, CAP-37888
ON CARr X t TO REPLACEMENT^ ' j I Hs-BUDD WHEEL CO . L.H. NUT. CAP-37885
pj be staked after assembly
C IhITk ! 1/ ILS \ i' i
/rl
2-TIMKEN BEARING CO. CONE 3382, CUP 3320—/ / -10-BUDD WHEEL CO. NUT-2686-E-7
2-TIMKEN-DETROIT AXLE CO . SEAL 5X173-' _ITtIMKEN-DETROIT AXLE CO. SPACER-1244-W-75
2-TIMKEN-DETROIT AXLE CO. RETAINER-1205-H-I64 RA PD 6520
Figure 47.-—Rear wheel hub assembly.
78
TM 9-1235
46
3 7-MM ANTIAIRCRAFT GUN MATERIEL
WASHER. LOCiCIv-NUT TERMINAL-Na 110006 FvFeW OF DRUM SHOWING CORED HOLE ____
NO. 11033£j\\\WA5HERU^pK^Kl^l' °° H FOR DRAIN ALTERNATE METHOD I
— \\\v-lNSULATOR-NO. 11561 1— Z \ U,
TERMINAL-! \\\\ BUSHING. TERMINAL. I | n A KA'1 \ °\ :
NO. 11O283]\ \\\\ INSULATOR-NO. 117580 ----/ ifTiU I i
NUT-NO. 11965-,\V^^^_^_^--^^^”^ ARMATURE" ( \ \ •
WASHER. LOCK] \ SCREW. DRIVE] ZAKknS ~A / \ / U
NO. BECX2G PARKER-KALON —। NO „ A F
CLAMP WIRE1J NO. 4x3/J6J IL-_J---- NO. 110409J ^MINOR BRAKE ASSEMBLY NO. 50174
NO. 11937]-’ /V (PLATE. NAME VIEW OF ADAPTER-NO 4777 PRESSED STEEL
// * I NO HO338 TZa if /
BLOCK. TERMINAL // / ,.,ATr »TtZXA® / 0
INSULATOR-/ A NOTE.-CHECK ALL /zZxA\
NO 11844 Pf k A \ BRAKES F°R C0RRECT 1 J C =1
------------ / I If f \ 1 I ARMATURE DEPRESSION. pP. Z C I i \ | I < fl STUD. TERMINAL । / ( Ol (( )))] kj IF CAGE READS LESS . tZj_1 J I ■ > I I KU JT!HlE-—drain hole \. \ X <-> x / /
WffS- J/'-SCREW. DRIVE. PARKER-KALON |'| 0 I pK——-MAGNET. ASSY-NO. 4711-A /
NO. 4x3/16" n IL__j M -------RH ARMATURE-NO. 4475
CLAMP. WIRE-NO Il937v L H. ARMATURE-NO. 4476
WASHER. L0LK BtCX2C .g/L.- -- [lining TO BE FERODO RIGHT & LEFT
NUT NO >>965-^7^.------------'TUD' TERMINAL.NO. > 1819 >R*KE L.NING B L 102W s~
wa'heT] / //®FV----------BLOCK. TERMINAL. INSULATOR-NO 1.1844 \ L gIGHT SHOWN
TERMINAL NO 110064 // V\\'TA‘ / \\---PLATE BACKING WELDING. ASSY-NO 50086
WASHeTL// \V---------BUSHING. TERMINAL INSULATOR-NO. 11758 ' A----DRUM-NO. 50071
HVXNnnmiF / \X— INSULATOR-NO. 11561 \ /
LOCK NU HUT3J / ---TERMINAL-NO 110283 ---- TYPE SHOWN - WARNER ELECTRIC BRAKE CO DR NO. 12-163
NUT. TERMINAL- /
NO 110006
NOTE: UNLESS OTHERWISE NOTED ALL PIECE MARKS AND ASSEMBLY NUMBERS REFER TO
WARNER ELECTRIC BRAKE MFG CO RA r0 jjjg
Figure 49.—Rear wheel brake assembly, disk type electric brake.
80
TM 9-1235
46
37-MM ANTIAIRCRAFT GUN MATERIEL
/ Z'' JR"*
\ —FITTING-CLDXIA
_____X /Z3 --GUIDE -AI46760
■ 978 N// /[-NUT-AI46758
_____________________________ 3049 - —1 I r-NUT-AI46759
, m -SHIM-8127838 / I \vC0VER-B.27840
-DE-A.46761^ “3 -=:= [ \
“eArXk^X V^EW-BCGX3FF A\ ^CYLINDER-0268,2 : |
FITTING-CLDXIA-.\\ \ \ AX» ,,, , ,, SAAA r,......... / > .. . ■ A
EYE- B127841 ' 4 I /.....
OR B161035 / ►■■ X . . ..' . .. ' . --" '■ y. ■■ .. ..J. rzXl___ ■ ." ;.. ■■■y^SP3 ]
/ J&CC-ZMKA I I ^GUARD-8161061
PIN-BFDX4T— ffT SCREW-AI482I3
PIN-BFAXIDF
RAPD 2 3907 ,,,e LJ“I
—-----------7.375 _
______________________________!-----------------33.75 ---------------
FACE FITTING TOWARD MUZZLE,BOTH SIDES.
Figure 50.—Equilibrator assembly, M3 carriage.
465292°—42---6
81
TM 9-1235
46-48
ORDNANCE MAINTENANCE
d. Loose parts.—Worn bearings or loose wheels will cause erratic action of the brake and can be evidenced by the wide track the pole faces of the magnet make on the armature. Wheel hub may be cracked or broken and must be replaced.
47. Equilibrator, M3 carriage (fig. 50).—a. Replacement of equilibrator spring.— (1) Remove the gun from the cradle.
(2) Elevate the cradle to its maximum point.
(3) Remove guard (B161061) and cover (B127840) from the end of the equilibrator.
(4) Remove nuts (A146759) and (A146758) from the piston rod. As nut (A146758) is turned off the rod, the spring will extend to its free length.
(5) Remove guide (A146760) and the equilibrator spring.
(6) Assemble in the reverse order of disassembly, using a new spring in place of the one removed.
(7) Adjust the equilibrator as outlined in TM 9-235 so that there will be equal ease in raising and lowering the gun and cradle.
b. Removal from carriage.— (1) Remove the gun from the cradle.
(2) Elevate the cradle to its maximum point.
(3) Remove the equilibrator spring as described in a above.
(4) Remove cotter pin (BFAX1DF) and drive out pin (A146788).
(5) Remove support (B127839) by removing screws (BCAX1BA) and washer (BECX1H).
(6) The cylinder (D26812) can now be removed from the carriage.
(7) If it is necessary to examine or replace the bearing behind the equilibrator rod, remove screw (BCGX3FF) and unscrew cap (A146789). The bearing is then accessible through the side of eye (B127841).
48. Equilibrator, M3E1 carriage (fig. 51).—a. Replacement of equilibrator springs.— (1) Remove the guns from the cradle.
(2) Elevate the cradle to its maximum point.
(3) Loosen stud (A152297).
(4) Unscrew head (B181857).
(5) Remove washer (B181856), spring (152296), and stud (A152297), by pulling out on the head.
(6) The rest of the procedure is the same as that for the M3 carriage.
(7) Assemble in the reverse order of disassembly using a new spring or springs in place of the defective ones.
b. Removal from carriage.—This operation is similar to that for the M3 carriage.
82
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 48
nut-bbaxic
_________________ WASHER-BECX1K
SHIM-Ai 48865 : 1____। ------------- SCREW - Al 48866B
NUaVu^rJcxik ll \ ----•—Lfitting-cldxia
WASHER-BECX1K. i i \/C' '' C\ ]
SCREW-A148866A| ) VV T A- \
FITTING-CLDX1A----’ CUARD-A146586'7=? । '--SCREW-BCCXI AR
BLOCK-C53553---fJ- fa-i M
r ■■■■'IL
BEAR INC-A146800-I ( A \ .4 --CAP-8127849
CAP-B127848---) 0 ----BLOCK-C53554
LOCK NUT-A146802—FrZF PIN-BFDX2CC
CP U?------ WASHER-BECXIM
WASHER-A14680I---------------------------- | \ SCREW-BCAXI ED
-I-------SECMENT-D26752
SECTION A-A [ ,
mT RA PD 6525
Figure 53.—Cradle assembly, M3 carriage.
85
TM 9-1235
50 ORDNANCE MAINTENANCE
SCREW. CAP B HD-BCEX2AA] SCREW' MACH' RD HD BCNX2AC
SCREW. CAP, HEX. HD-BCBX8AP] WASHER. LOCK-BECXIG ' WASHER, LOCK-BECXIE SCREW. CAP FILL HD BCCXIAR
NUT, HEX . CASTLE-BBFX2A- NUT, HEX.-BBAXIA A kA HtXSBKX2C SCREW Zp LLZ Z
PIN. COTTER-BFAXI DhJ ---------J \ ---PLATE. BAFFLE-042186 SCREW. CAP. HEK HD-BCAX2AP|
FORK-BI28696-, J \'A V SCREW. MACH. FL HD-BCKX2EG CREW-A147058]
rr-fl J, JCZ 4 L \ U //-CHUTE-C5450I
NUT-AI52276 1 fa Ti 1 z±\ V // r ' z-. ----,
STEM ADJ R128497 ~ \4l~" ffA // n ~* CUARD-A146586
STEM. ADJ.-Bl 28697 .. ,, W Zph \ ,'W jl'rSil WASHER. LOCK-BEAXIF
WASHER-BEBXIR-! JhO. 1: LJItSTISCREW. MACH. RD. HD.-BCNX2AC I
NUT. HEX. CASTLE-BBFX2C k-CFqjj t .' 1 Lt° "'"iFA'l 5 I ~T __________x/
PIN. COTTER-BFAX1 DHj ||] T [Jj ■ ® /__________|_| / B
SCREW, CAP. HEX., Ht/jJ \ Z / Z
bcaxiecJ y" hW Urr -q r *A / = l(CZ)>rA
WASHER, LOCK-BECXIM-4 XL/ 1 BODY, /KMMUN Ng- /
KEY-BI60493-\X / / \
SCREW, CAP, HEX., HD.-BCAX1EE1 A\ // [G4SH4 » q m
WASHER, LOCK-BECXIM] F\ CRADLE-D42I7I-1 / Z q /// I
-----SEGMENT-D26752 // | I
SECTION A-A kF NOTE:—PITCH CIRCLE MUsZ/zZ——-A"'
zifkyZ/ NOT VARY MORE THANLPAN
CAP-B127848N Tf-NLy XJJ^AaP-B127849 °025 FROM TRUNNIONS, /
NUT. LOCK-A 146802- jf-j WS ----BLOCK-C53554 PIN. COTTER-BFAXICD /[piN Rpnvjrz-
BTAXct/Sw H W -TN- _ l-SsS'SK.BeCX.M
R ISSCREW. CAP. HEX HD-
BL0CK-C53553- J 'L/-' [BCAXIED
Lil NUT, HEX.-B8DX2bJ L_pin.A)52279
WASHER-BEBXIP—I ---SPACER-AI52277
SECTION B-B FORK-BI28695- 1----BUSHING. ADJ.-Al52278
SECTION C-C RA PD 6530
Figure: 54.—Cradle assembly, M3.E1 carriage.
86
3 7-MM ANTIAIRCRAFT GUN MATERIEL
TM 9-1235
50
1 —NUT. LOCK- A146802 __________ pB ,0/ n < ryj
2 — FITTING-CLDX1A /H jd]\ fl /Jh | =
3 —BEARING-A146800 X II 11/ 111 1) | g [ //’2 f VX-X'9 '-------------------— [■ / J 27 /// [ 23
4 — BLOCK - C53553 fl ■ ' k5 tfgf
5-SCREW. CAP-Al 49205 V □ T IXX H LJXQy ' *" “ [ X 25 I / '24
6 —FITTING-A2I7591 [I \\ \ I l l <—B/ XX
7-SH,M’A'49’86 vJM L- xV
8-WASHER-A146801 uZi/l \\ /O il 05
g CAP R127R4R NECESSARY TO _ / \. J |l 22 -----—x
MAKE CLEARANCE OjO XO [ PITCH CIRCLE MUST Z Z
\\ I 03 as shown. is xpf o J not vary more - '
3 ^B1Tt_03 °3.-. ;fgJ 1» -'I THAN .0025 FROM I i----
| 'TZraU —X'"' 30 31 trunnions. 31 30 f-'0 -
8/fM/' 28 X\yX~wX29 28
10 —PLATE ASSEMBLY-B172908 j | 17J V13 XjyJ/ \W :
11—WASHER. LOCK-BECX2R \\ /—1 14 I T
-XZ 15 32 VIEW B-B 32
12—NUT, JAM-BBDX2C ]Jj
13 —CAP-Bl 62255 SECTION A-A 27 — SCREW - Al 49125
14—BLOCK-C53554 fSCREW. CAP. HEX. HD. - BCAX2AP „ \SCREW. CAP. HEX. HD. - BCAX1 EE 28 — ASSEMBLY. ELEV. &TRAV SIGHT - D42247 .
— /SCREW-Al47058 Li ~/WASHER, LOCK-BECX1M
15 — SHIM-AI49187 29 — SCREW. MACH FIL HD. - BCFX2BF
20 —SCREW, CAP. FILL HD.-BCCX1AR 24 — KEY - B160493
16 —SHIM-A218205 30 — BRACKET - Bl62365
iSCREW. CAP. HEX. HD. - BCAXI ED ,, \SCREW. CAP. HEX. HD. - BCAXI EC
17 — $HIM - A218206 ~ /WASHER, LOCK - BECXiM — /WASHER. LOCK - BECX1M 31 — KEY - A2I7583
18 —CRADLE-D42225 22 — RACK. ELEVATING - D42235 26 — PIN - BFDX2CC 32 — CHAIN. ASS Y - A217585 RA PD 6508
Figure 55.—Cradle assembly, M3 Al carriage.
87
TM 9-1235
50-51
ORDNANCE MAINTENANCE
(3) Remove lock screws (BCCX1AR) and then unscrew the caps from each trunnion.
(4) Unscrew lock nuts (A146802).
(5) Remove screws (BCAX2AP) from blocks (C53554) and (C53553), thus loosening the cradle from the carriage. The cradle will have to be supported by a block and tackle at this time.
(6) Pull blocks (C53553) and (C53554) off of the cradle trunnions.
(7) The bearings can now be removed from the blocks.
c. Assembly.— (1) Before assembling, see that the screws holding the elevating rack to the cradle are tight and in place.
(2) Assemble in the reverse order of disassembly.
(3) When assembling cradles to the M3 and M3E1 carriages, it will be necessary to turn the elevating handwheel as far as possible in the “depress” direction. Then assemble the cradle to the carriage at 0° elevation and mark the teeth of the rack that engage the worm. After assembly, operate the elevating handwheel to its limits in each direction and note whether the cradle goes through its range of 0° to 85° in elevation. If not, the cradle will have to be removed and replaced with teeth neighboring the marked ones in engagement with the worm. Test again to note the position of the cradle with respect to the elevating handwheel. When the stops of the elevating mechanism allow the cradle to go through its entire range, tighten the blocks (C53553) and (C53554) securely in place.
(4) Elevate the cradle to 85° when ready to connect the equilibrator to the cradle.
d. Removal of caliber AO machine gun from cradle of M3E1 carriage (fig. 54).—(1) Remove the nuts (BBDX2B) from the bottom of fork (B128695).
(2) Remove the similar nuts from the fork, supporting the front end of the caliber .50 gun.
(3) Disconnect the firing mechanism from the gun.
(4) Lift the gun, together with the forks, from the cradle.
e. Assembly of the caliber .50 machine gun to the cradle of the M3E1 carriage.—Reverse the procedure given in d above.
51. Lubrication.—a. Lubrication guide.—Lubrication instructions for all points to be serviced by the using arm are shown in the lubrication guide (figs. 58, 59, and 60) which specifies the types of lubricants required and the intervals at which they are to be applied. Supplementary instructions appear in the notes. These guides are to be used for the M3, M3E1, and M3A1 carriages.
88
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 51
89
TRAVERSING MECHANISM-D26911-—. '/W'' V-
washer-becxim!___ yy // 9 w V —elevating mechanismd269io
SCREW-BCAX1 EC[ \ // y j! | \- \/FOOT FIRING MECHANISM-D4I7I5
SEE CRADLE ASSEMBLY-D41709-\* \ /7 -^==d' ) ( '=~===^ Vv+x
TOP CARRIACE-D26831—. mA // Z ZzUEj 'A" / &’1=E\ '
EQUILIBRATOR ASSEMBLY-D2681 Wj V/ aSSEMBlTT^N.
" C53629 " <;
E—---------' I '/) SCREW-BCAXIEeI [SCREW-BCAXI EC
SCREW.AMaiST-UF^Za.X;;Z1Z«^_,- FOOT REST-D41747 H w NUTBBAXIE 7/f'z AL WASHER BEAX2B
NAME PLATE-A147349 x F°°T RESTD26983 J\ WASHER-BECX ImJ L
PIPE PLUC-CPMXIB-tL~*' r- ’ _____ I I lUL=---------
COVER-6127906____ LEFT SIDE ^===A J RIGHT SIDE ----COVER-D26834
NOT REQUIRED FOR MOUNTS] \ -----^^pbcREW-BCAXlAA
WITH 360 DRIVE[~\\ ---PIN-BFDX6EG
PI PE • A147103-. \ \ / [ YZ-■ fl-------BUSHING-6127907
ELBOW-60’'A-l8 NPT-A i //X X X u
PIPE-A146890-A\ \ \ I ///yZX
FITTINC-CLDX1A-, \ \\ j\/---------COVER-D26827 TOP CARRIAGE ASSEMBLY
COVER - D26826-.III
1 tF,T AT assembly to allow
—! /®Al' '7 • c !;i’(N-.0002 CLEARANCE BETWEEN COVERS
- l Z \ V — SOCKET
—I SECTION ON CL. \ SCREW-AI46669
''-1NUT-A146668
WASHER-BECXIP RA PD 6529
Figure 56.—Top carriage assembly, M3 carriage.
TM 9-1235
51 ORDNANCE MAINTENANCE
SUPPORT-C87018-//[SCREW-BCAX1 ED
/ 'JwASHER-BECXlM
C. L. OF TRUNNIONS^ ///-CARRIAGE, TOP-D42222
SCREW-BCAXIeFI____ | /////-TRAVERSING MECHANISM D42258
WASHER-BECX1M| I A'A1] /////[HYDRAULIC GEAR SWITCH MECHANISM
NUT-BBAX1E I I I 9 ) //////T242238
WASHER-BECX1M| \ Z.l/s xd. /// /// /'--PLATFORM ASSEMBLY D42303
BRACE-B162258—x \ / Sj/ /// / /—SEAT ASSEMBLY D42254
PLATE - Al49180^—^^ J—' WW /// / / //
SCREW - A148154-\ / / /
EQUILIBRATOR ASSEMBLY D42243-v V/ / / / /
BRACKET D42234—\ \ I ____V / / I
3---- to) J A'®, ■ F / / / /»
______________________—--\ I i° i \ / / / / ____________"______\ —V / / J ill_\ -———7^
II ill ------ \ J । i / ".y
NUT-BBAX1E __ J
SCREW-BCAX1 EG —\Zj____J|\ JdLgSg i > I - /
WASHER-BECX1M \ x A=' J ' io i io jA
------------------ i culltAC (A149175, A149176. A149I77 -------C. L. OF ROTATION T --------------T~ ' (A149178, A149179 v------BUSHING-B127907-_ _ 2. 1 A i i -------CLIP D42246
FITTING-CLDX1A W. L. OF ROTATION
i s ___PIN RFDX^Fr* SCREW-A149174
22,5 1^^ WASHER-BECX1M
"^1 NUT-BBAX1E
RA PD 6505
SECTION A-A
Figure 57.—Top carriage assembly, M3A1 carriage—left side view.
90
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 51
b. Lubrication service instructions.— (1) Wheel bearings.—To clean and pack wheel bearings properly, they must be removed from the hub. Follow the procedure below.
(«) Remove the bearings from the hub and wash them in solvent, dry-cleaning, until all the old grease is removed.
(&) Lay them aside to dry and wash the inside of the hub and the spindle with solvent.
(
Buffer Cylinders OG 2W -(Note 5)
2W
2W
2W
2W'p 6M
OG
06
Drawbar Pivot Pin
2W
OG
Steering Link Pin
OG
Front Axle Sleeve
OG
Upper Steering Arm
o o oo o o o o o o o
2W OG Steering Link Pin
0E Leveling Mechanism
OG Leveling Bearing
OG Traveling Lock Bearings
OG Operating Lever Bearing (Some models) (Note 7)
• Interval 2W
o o oo o oo o o WWW ■°o0%o0o0o0o0o0o°o0 "o°o«°o0M^ WWo°W°°r
KEY
Interval • Lubricant
Drawbar Hinge Pin
2W
2W
2W OG Steering Arm Pivot
OE—OIL, Engine
SAE30 (above +32°)
SAE 10 (below +32°)
LUBRICANTS___________________
OG—GREASE, O.D.
No. 0 (above 4-32°)
No. 00 (below +32°)
WB—GREASE, General Purpose No. 2
INTERVALS
W—WEEKLY 2W—2 WEEKS
M—MONTHLY
6M—6 MONTHS
RAPD239O6
Figure 58.—Lubrication guide for chassis.
92
TM 9-1235
37-MM ANTIAIRCRAFT GUN MATERIEL 51
Notes.—Additional lubrication and service instructions on individual units and parts.
Cold Weather.—For lubrication and service below —10°, refer to OFSB 6-5.
1. Fittings.—Clean before applying lubricant. Caution.—Lubricate after washing gun and carriage.
2. Intervals.—Those indicated are for normal service. For extreme conditions of speed, heat, water, mud, snow, rough roads, dust, etc., lubricate more frequently.
3. Wheel bearings.—Remove wheel, clean and repack bearings.
4. Counterpoise cylinders —Remove cap on outer end of cylinder and coat the surface above piston with OG monthly.
5. Buffer cylinders and outrigger 1 urnbuckles.—Caution.—Excessive grease in units will cause malfunction. If overfilled, remove grease fitting and operate parts to force out excessive grease.
6. Oil can points.—I rubricate buffer adjustment linkage, buffer rod, counterpoise cam bracket, outrigger hinge pins and hand levers with OE weekly.
7. Points to be lubricated by ordnance maintenance personnel at time of ordnance inspection.—Leveling mechanism worm (on left unit), ratchet type operating lever bearing (some models).
93
TM 9-1235
51
ORDNANCE MAINTENANCE
CAUTION —lubricate Dotted Arrow Points on BOTH SIDES
Lubricant • li
Hydraulic Oil Gear OH M (Notes 5 and 11)
Hydraulic Oil Gear Drain Plug
Oil Gear Chain Case
Level Plug
Oil Gear Chain Case OH 6M (Note 4)
Helical Gear lubricating OH M
Ball (Note 6)
Clutch Housing Drain Plug
Clutch Housing OH M (Fill and level plug)
Hydraulic Oil Gear Shaft OG M
Bearing (Sparingly)
Transversing Power Shaft OG M
Bearing (Sparingly)
Azimuth Indicator OE M
Traversing lower Gear OG M
Case (Sparingly) (Note 11)
Traversing Hand Crank OG M
Bearing (Sparingly)
Traversing Upper Gear OG M
Case (Sparingly) (Note 11)
Upper Gear Case Drain Plug
Cradle Trunnion Bearing OG M
Interval
M
• Lubricant
OE Top Carriage Support Brg. (Note 11)
OG Center Bearing
OE Traversing Rack (Note 11)
OG Foot Firing Pedal Shaft
OG Elevating Wormshaft Brg. (Sparingly)
Elevating Spur Gear Case Drain Plug
OE Elevating Spur Gear Case (Note 4)
Elevating Shaft Gear Case
Drain Plug
OE Elevating Worm Gear Case (Note 4)
OG Elevating Hand Crank Bearing (Sparingly)
OG lower Hand Elevating Gear Case (Sparingly) (Note 11)
OE Foot Firing Mechanism (Note 11)
------key------
LUBRICANTS
OE—OIL, Engine
SAE 30 (above +32°)
SAE 10 (below +32°)
OG—GREASE, O.D.
No. 0 (above +32°)
No. 00 (below +32°)
OH—OIL, Hydraulic
MO—OIL. Lub., for Aircraft Inst, and M.G.
INTERVALS
W—WEEKLY M—MONTHLY 6M—4 MONTHS
RAPD23905
Figure 59.—Lubrication guide for top carriage, M3A1 carriage.
94
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 51
Notes.—Additional lubrication and service instructions on individual units and parts.
Cold Weather.—For lubrication and .service below —10°, refer to OFSB 6-5.
1. Fittings.—Clean before applying lubricant. Caution. Lubricate trunnion bearings, foot-firing pedal shaft, and oil can points after washing gun and carriage.
2. Recoil fluid.—For instructions on type and quantity of recoil fluid, refer to War Department Recoil Fluid Guide No. 19 and OFSB 6-6.
3. Intervals.—Those indicated are for normal service. For extreme conditions of heat, water, dust, etc., lubricate more frequently.
4. Oil gear chain case and elevating spur and worm gear cases.—Check level monthly; add lubricant if necessary. Drain, flush and refill as indicated at points on guide. When necessary to drain, do so immediately after operation.
5. Hydraulic oil gears.—Remove cap from filter and fill through center hole, using gun provided, until oil, hydraulic, escapes from vent at side of filter.
6. Helical gear lubricating ball.—Remove cover, held on by six stud nuts, and fill recess around ball. Caution.—Do not allow moisture, dirt, or grit to enter open mechanism.
7. Flevating rack.—Clean and apply OE daily.
8. Breech and firing mechanism.—Clean and oil all moving parts and exposed metal surfaces with OE daily. Perform operation before and after firing. Caution.—To insure easy breech operation and to avoid misfiring in cold weather, clean with solvent, dry-cleaning, dry and lubricate with MO. To clean firing mechanism, remove and operate pin in solvent.
9. Gun bore.—Clean and coat with OE after firing. Inspect daily and oil if necessary.
10. Oil can points.—Lubricate crank handles, clevises and linkage with OE weekly.
11. Points to be lubricated by ordnance maintenance personnel at time of ordnance inspection.—Traversing and lower hand elevating gear cases, hydraulic oil gears, traversing rack and top carriage support bearings, foot-firing mechanism.
95
TM 9-1235
51
ORDNANCE MAINTENANCE
KEY
Equilibrator Trunnion Brgs,
Center Bearing
OG
Equilibrator Piston Rod End
OG
OG
Cradle Trunnion Bearings
Louer Gear Cate Drain Plugl
2 Speed Gear Box Level Ping
2 Speed Gear Box
Upper Gear Case
Lower Gear Case
(H.r. 7)
J RAtlTIHN *"O.
—I WMV IIVH f.irf, ,, (OTH Slots
Lubricants
Intervals
M-MoMkly
Elevating Lon er Gear Cate Drain Plug
Elevating Lower Gear Case
Elevating Worm Thrust Brg.
OG
Control Gear Case
OE
Firing Foot Pedal
OG
OG
Traversing Rael Housing
OE
Upper Gear Cast Lts tl plug
OE
Trarerfing Rack Housing Drain Plug
Upper Gear Case Drain Plug
M OE Lateral Deflection Coupling
2 Speed Gear Box Drain Plug
RA PD 23859
OE Traversing Rael Housing
Elevating Worm Gear Case (N.H 7)
Vertical Deflection Bevel Gears
Elevating Stop Mechanism Housing
Lateral Adjusting OE Worm
M OE Vertical Deflection Drive Worm Gear
Figure 60.—Lubrication guide for top carriage. M3 carriage.
OG
Traversing Rack Houting Drdin Plug
Notes.—Additional lubrication and service instructions on individual units and parts.
1. Intervals.—Those indicated are for normal service. For extreme conditions of heat, water, dust, etc., lubricate more frequently.
2. Fittings.—Clean before applying lubricant. Caution.—Lubricate center
bearing, trunnion bearings, and foot-firing pedal shaft after washing gun.
3. Elevating rack.—Clean and apply OE daily.
4. Breech and firing mechanism.—Clean and oil all moving parts and exposed metal surfaces with OE daily. To avoid misfiring below freezing, remove block. Dip block in solvent, dry-cleaning. Operate firing pin in solvent, lubricate with MO and replace mechanism.
5. Gun bore.—Clean and coat with OE after firing. Inspect daily and oil if necessary.
6. Points requiring no lubrication.—Sighting mechanism drive cables.
7. Points to be lubricated by ordnance maintenance personnel at time of ordnance inspection.—Traversing and elevating gear cases.
96
TM 9-1235
3 7-MM ANTIAIRCRAFT GUN MATERIEL 51
necessitate total or partial disassembly. New lubricant should be applied by removing the cover plate when possible. Apply grease through a fitting, and do not fill the housing to a point above the level testing plug.
(2) Traversing rack and top carriage support bearings.—Although the traversing rack and carriage ball bearings are inclosed, the lubricant becomes contaminated during use. To avoid damage, the parts must be disassembled and cleaned once yearly and repacked with grease, O. D., seasonal grade.
(3) Hydraulic oil gears (M3Al).—Due to expansion and contraction of oil, hydraulic, in these units, a breathing action is set up that tends to draw dirt and moisture into the mechanism. These impurities combine with products of oil oxidation and form sludge. Draining these units at intervals of 6 months and refilling them with fresh oil is essential and beneficial but, to prevent sludge deposits from becoming dangerously heavy, the mechanism will be disassembled and thoroughly cleaned once each year.
(4) Helical gear lubricating ball.—Remove plate on speed gear housing and refill chamber containing cork ball level full with oil, hydraulic.
(5) Leveling worm and bearing (M3Al).—Remove rachet handle and bearing. Coat worm and pack bearing with grease, O. D. Replace mechanism.
(6) Foot firing mechanism (M3Al).—Coat internal parts with grease, O. D., seasonal grade.
d. Reports and records.— (1) Reports.—If lubrication instructions are closely followed, proper lubricants used, and satisfactory results are not obtained, a report will be made to the ordnance officer responsible for the maintenance of the materiel.
(2) Records.—A complete record of lubrication servicing will be kept for the materiel.
465292°—42---7
97
TM 9-1235
ORDNANCE MAINTENANCE
Appendix
REFERENCES
1. Standard Nomenclature Lists.
u. Cleaning and preserving.
Cleaning, preserving, and lubricating materials______________________________________ SNL K-l
Soldering, brazing, and welding compounds. __ SNL K-2 b. Gun materiel.
Gun, automatic, 37-mm, M1A2 and carriage, automatic gun, 37-mm, M3 and M3A1----------SNL A—29
Gun, machine, cal. .50, Browning, M2, water-cooled, fixed and flexible-----------------SNL A-37
c. Tools, special repair----------------------- SNL A-35
d. Current standard nomenclature lists are as tabulated here. An up-to-date list of SNL s is maintained as the Ordnance Publications for Supply Index (OPSI).
2. Explanatory publications.
a. Cleaning, preserving, and lubricating materials. TM 9-850 b. Fire control.
System, remote control, Ml-----------------TM 9-1643
System, sighting, M2-----------------------TM 9-1606
c. Gun materiel.
Artillery gun book_________________________ form 5825
Service of the piece, 37-mm antiaircraft gun__ FM 4-140 37-mm antiaircraft gun materiel------------ TM 9-235
d. Maintenance of materiel in the hands of troops. OFSB 4-1
Maintenance and care of pneumatic tires and rubber treads______________________________TM 31-200
98
TM 9-1235
INDEX
Paragraph Page
Alinement, wheels____________________________________________ 25, 44 16, 70
Antitank firing______________________________________________ 2 1
Back plate buffer____________________________________________ 12 7
Brakes:
Disk type--------------------------------------------------- 46 72
Inspection__________________________________________________ 21 15
Lever type__________________________________________________ 45 70
Buffer, back plate_______________________________________—~ - 12 7
Buffer mechanism:
Inspection___________________________________________________16 8
Maintenance and repair----------------------------------- 32 30
Carriage data____________________________________________________ 3 2
Characteristics------------------------------------------------ 2 1
Chassis:
Inspection__________________________________________________ 15 8
Maintenance and repair___________________________________ 31 30
Counterpoise cylinders__________________________________________ 17 10
Cradles:
Inspection__________________________________________________ 23 16
Maintenance and repair-------------------------------------- 50 84
Data:
Carriage_____________________________________________________ 3 2
Gun__________________________________________________________ 4 4
Disassembly, personnel authorized--------------------—------- 1 1
Driving spring assembly:
Inspection_____________________________________;--------- 8 6
Maintenance and repair-----------------------------:----- 30 27
Electrical circuit___________________________________________ 34 30
Elevating mechanism:
Inspection________________________________________________ 18 10
M3 and M3E1 carriage________________________________________ 37 46
M3A1 carriage----------------------------------------------- 38 53
Equilibrator:
Inspection-------------------------------------------------- 22 16
M3 carriage------------------------------------------------ 47 82
M3A1 carriage_______________________________________________ 49 84
M3E1 carriage----------------------------------------------- 48 82
99
TM 9—1235
INDEX
Paragraph Page
Feed box mechanism_________________________________________ 10 7
Firing mechanism------------------------------------=------ 14 7
Foot firing mechanism:
Inspection------------------------------------------------ 10 10
M3 carriage----------------------------------------------- 39 58
M3A1 carriage_____________________________________________ 40 61
Gun—
As a unit------------------------------------------------ 6 6
Data------------------------------------------------------ -1 4
Tube------------------------------------------------------ 7 6
Inspection:
Back plate buffer_________________________________________ 12 7
Brakes____________________________________________________ 21 15
Buffer mechanism----------------------------------------- 16 8
Chassis___________________________________________________ 15 8
Cradles___________________________________________________ 23 16
Counterpoise cylinders------------------------------------ 17 10
Driving springs-------------------------------------------- 8 6
Elevating and traversing mechanism------------------------ 18 10
Equilibrator______________________________________________ 22 16
Feed box mechanism---------------------------------------- 10 7
Firing mechanism------------------------------------------ 14 7
Foot firing mechanism------------------------------------- 19 10
Gun as a unit---------------------------------------------- 6 6
Gun tube--------------------------------------------------- ~ 6
Leveling mechanism---------------------------------------- 20 15
Lock frame------------------------------------------------- 8 6
Outriggers---------------------------------------------- 24 16
Purpose---------------------------------------------------- 5 5
Recuperator mechanism------------------------------------- 11 7
References_______________________________________________ 5 5
Tools______________________________________________________ 5 5
Trunnion block-------------------------------------------- 13 7
Tube extension assembly------------------------------------ 9 7
Wheel alinement------------------------------------------- 25 16
Leveling mechanism:
Inspection________________________________________________ 20 15
M3 and M3E1 carriages------------------------------------- 41 62
M3A1 carriage--------------------------------------------- 42 67
Lever type brakes--------------------------------------------- 45 70
Lock frame_____________________________________________________ 8 6
Lubrication--------------------------------------------------- 51 88
100
TM 9-1235
Outrigger assembly: Paragraph Page
Inspection----------------------------------------------- 24 16
Maintenance and repair----------------------------------- 33 30
Personnel authorized to make repairs__________________________ 2 1
Publications, explanatory__________________________________ App. 98
Recuperator mechanism:
Inspection_______________________________________________ 11 7
Maintenance and repair___________________________________ 29 24
References___________________-____________________________ App. 98
Second echelon operations------------------------------------ 28 24
SNL’s______________________________________________________ App. 98
Tools:
Inspection________________________________________________ 5 5
Maintenance and repair------------------:------------- 27 24
Traversing mechanism:
Inspection_______________________________________________ 18 19
M3 and M3E1 carriages------------------------------------ 35 37
M3A1 carriage____________________________________________ 36 42
Trunnion block----------------------------------------------- 13 7
Wheel alinement------------------------------------------- 25, 44 16, 70
Wrenches_____________________________________________________ 27 24
[A. G. 062.11 (3-31-42).]
By order of the Secretary of War : G. C. MARSHALL,
Chief of Staff.
Official :
J. A. ULIO,
Ma jor General., The Adjutant General.
Distribution :
IBn9 (1); IC 9 (3).
(For explanation of symbols see FM 21-6.)
U. S. GOVERNMENT PRINTING OFFICE: 1942
101
(Form 14 - 5/73)
UNT LIBRARIES. DENTON,TX 76203
1000961106
NTSU LIBRARY