[75-MM Howitzer Matériel]
[From the U.S. Government Publishing Office, www.gpo.gov]


mhmmmbp TM 9-1320
Document Reserve
WAR DEPARTMENT
TECHNICAL MANUAL
ORDNANCE MAINTENANCE
75-MM HOWITZER MATERIEL
June 20, 1941
non-circulating
ntsu library
TM 9-1320
TECHNICAL MANUAL No. 9-1320
WAR DEPARTMENT, Washington, June 20, 1941.
ORDNANCE MAINTENANCE
75-MM HOWITZER MATERIEL
Prepared under direction of the Chief of Ordnance
Section I. General.	Paragraph
Purpose________________________________________ 1
Scope------------------------------------------ 2
References_____________________________________ 3
II.	Instructions for inspection.
General________________________________________ 4
Inspection of bore_____________________________ 5
Inspection of howitzer and carriage____________ 6
Manometer test_________________________________ 7
Inspection of light caisson, Ml, and light limber, M2________________________________________ 8
III.	Tools for inspection.
General________________________________________ 9
Tools for inspection__________________________ 10
IV.	Instructions for maintenance and repair.
General_______________________________________ 11
Disassembly of axle sleeve and traversing nut (75-mm pack	howitzer carriage,	Ml)_____	12
Assembly of axle sleeve and traversing nut
(75-mm pack	howitzer carriage,	Ml)______	13
Adjustment of equilibrator (75-mm pack howitzer carriage, Ml)________________________ 14
Dismounting of cradle (75-mm howitzer carriage, M2A1, M3, and M3A1)____________________ 15
Disassembly of elevating and traversing mechanism (75-mm howitzer carriage, M2A1, M3, and M3A1)_________________________________ 16
Dismounting top carriage (75-mm howitzer carriage, M2A1, M3, and M3A1)_________________ 17
Removal of spring carrier (75-mm howitzer carriage, M2A1, M3, and M3A1)_________________ 18
Disassembly of brake mechanism________________ 19
Special repair tools__________________________ 20
Light caisson, Ml, and light limber, M2_____	21
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V. Tools for maintenance and repair.	Paragraph
Chest, tool, special repair______________________ 22
Tool, driving hub liner__________________________ 23
Bolt, equilibrator, assembly_____________________ 24
Compressor, spring (for M3 carriages having spring* carriers only)___________________________ 25
Puller, gear (for M2, M3, M3A1 carriages)_____	26
Page
Appendix. List of references__________________________________ 46
Section I
GENERAL
Paragraph
Purpose-------------------------------------------------------- 1
Scope__________________________________________________________ 2
References_____________________________________________________ 3
1.	Purpose.—The purpose of this manual is to furnish suitable instructions for the inspection and maintenance and shop repair of the 75-mm pack howitzer, and carriage, Ml, and 75-mm pack howitzer, Ml Al, and howitzer carriages, M2, M3, and M3 Al. They are for use of ordnance maintenance companies, civilian employees of the Ordnance Department, Reserve officers, National Guard, and Reserve Officers Training Corps students, charged with the maintenance and repair of the materiel.
2.	Scope.—This manual contains instructions for inspection, disassembly and assembly, and maintenance and repair, supplementary to those instructions covered in TM 9-320 and TM 9-1100. It also describes and prescribes the use of special repair tools.
3.	References.—The appendix lists references to other publications relating to the materiel covered herein.
Section II
INSTRUCTIONS FOR INSPECTION
Paragraph
General_________________________________________________________________   4
Inspection of bore________________________________________________________ 5
Inspection of howitzer and carriage--------------------------------------- 6
Manometer test------------------------------------------------------------ 7
Inspection of light caisson, Ml, and light limber, M2_____________________ 8
4.	General.—Inspection is for the purpose of determining the condition of the materiel, -whether repairs or adjustments are required, and the remedies necessary to insure that the materiel is in such
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serviceable condition that it will function properly. A record of all inspection and maintenance will be kept in the Artillery Gun Book, O.O. Form 5825. Instructions for the use of the gun book are outlined in its introductory pages. See also OFSB 4-1.
5-	Inspection of bore.—a. I he estimated average accuracy life in full service rounds of the 75-mm pack howitzers, Ml and M1A1, is 12,000 rounds. The howitzers in service shall be star gaged at approximately 10 percent and 90 percent of their estimated average accuracy life in rounds fired, and thereafter at 10 percent during the remainder of their service. Also, they should be star gaged at any time an inspector may deem it necessary on account of doubtful condition, or when the bore shows signs of unusual wear or other irregularities. Decoppering of the bores of cannon before star gaging is prohibited. When star gaging the 75-mm howitzer, Ml, or 75-mm howitzer, M1A1, the greatest distance from the muzzle at which star gage measurements are to be made is 35.75 inches.
b. For pastilles or other defects of the bore of the howitzer which require plaster of paris or gutta-percha impressions for measuring 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. When a howitzer is to be stored for an extended period of time otto be shipped a long distance, especially if the voyage is over water, the bore should be coated with rust preventive as prescribed in SNL K-l. For ordinary protection, care must be taken to insure that the bore is coated with light lubricating oil, SAE 10-W, for temperatures less than 32° F, and SAE 20-W, for temperatures greater than 32° F.
6. Inspection of howitzer and carriage.—The inspection of the howitzer and carriage and instructions for inspection and verification of sighting and fire-control equipment as outlined in TM 9-320 should be followed. The following additional inspection of the carriage and recoil mechanism should be observed:
a.	The recoil mechanism should be inspected for oil leakage, pressure of compressed nitrogen, friction of various packings, serviceability of the oil index, and condition of the cradle ways.
b.	To test the reliability of the oil index (fig. 13), insert the oil release, B103913 (fig. 6), in the oil filling and drain valve hole located on the right side near the front end of the recoil cylinder and drain the reserve oil. The oil index should start to move in before the oil ceases to flow and should recede within the oil index follower when the reserve is exhausted. Refill the mechanism as outlined in
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TM 9-320, paragraph 62e(l) and’ (2). The oil index should start to move out after about five revolutions of the oil screw filler screw.
c.	The proper “full oil reserve” in this system is an amount equal to one-half screw fillerful in excess of the quantity that can be forced into the system without being ejected when the oil release is screwed into the filling and drain hole. With the system filled, any slight amount of reserve oil forced past the recoil cylinder filling valve, A19763 (fig. 15), will force the floating piston against the established pressure, thereby building pressure on the oil side of the system to the extent of the nitrogen pressure present in the recuperator system. The forcing of additional charges of reserve oil into the system to increase the nitrogen pressure definitely is prohibited.
d.	Remove the recoil cylinder rear head, B17563 (fig. 12). If clear oil is present, it indicates a leak past the recoil piston. Remove screw7, BCDX2AA (fig. 14), and disk, A15869, and tighten the piston head, A15872, slightly. Wipe the cylinder dry and note whether oil continues to seep past the piston. In this case it is an indication that the recoil piston packing is faulty, and the mechanism should be sent to a base shop for repair.
e.	Examine the face of the oil index follower, A135611 (fig. 13), for indication of oil leakage. If a leak is present, tighten slightly on the follower, using great care not to bind the oil index. If leakage continues, renew the oil index packing.
/. Examine the seat between the recoil and recuperator cylinders entering the yoke assembly. If an oil leak is present, the mechanism should be sent to base shop for repair.
g.	Examine the guides of the bottom sleigh for burs or scoring.
h.	Assemble the bottom sleigh, howitzer, and top sleigh of the carriage. Note that the bottom sleigh slides freely and without excessive side play of 1 mil (0.050) in the cradle. Note that the howitzer sets into its seat without binding and that the top sleigh locks the howitzer in position without strain.
i.	Elevate the howitzer through its arc on either the pack howitzer carriage, Ml, or the howitzer carriages, M2A1, M3, and M3A1, to see that the operation is smooth and the balance of the howitzer is being controlled by the equilibrator. Rotate the traversing hand wheel through the entire angle of traverse on the howitzer carriages, M2A1, M3, and M3A1, to see that the operation is smooth. If the backlash of the elevating crank (fig. 17) or the elevating or traversing handwheel (fig. 8 or fig. 9) exceeds one-eighth of a turn, it should be corrected by adjusting the bearing retainer, B103539 (fig. 8) or B106970 (fig. 9). Examine the rocker (fig. 16) or elevating arc (fig. 7) for burs or scored teeth.
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/ Examine the top and bottom carriage of M2A1, M3, and M3A1, for flaws in welded components.
k. Examine the barrel of the equilibrators for rough or scored walls.
Z. Examine the trails of the pack howitzer carriage, Ml, and howitzer carriages, M2A1, M3, and M3A1, and see that all implement fastenings are in good condition. Examine all trail fastenings and traveling lock connection brackets for broken welds. Examine trail hinge pins and see that they are being lubricated properly.
7. Manometer test.—In order that an intelligent and consistent inspection may be made of the recoil mechanism, it is essential that the inspector be informed not only as to its action but also with regard io certain of its technical peculiarities with which he will come in contact. Therefore, examination for excessive oil leakage past the packing of the recoil piston, recoil piston rod stuffing box, oil index, and filling and drain valve should be made. Normally, a slight leakage of discolored oil past the packing of the recoil piston and the recoil piston rod stuffing box is in evidence. The slight leakage past these two packings insures lubrication.
a. General tests.— (1) The “oil reserve” or “reserve oil” are terms applied to that portion of the oil which normally separates the floating piston from the regulator. Referring to sectioned view (fig. 12), it will be apparent that the compressed nitrogen acts to put pressure on the oil only so long as there is oil between the regulator and the floating piston. After these components come in contact, further movement of the floating piston is prevented and consequently the pressure of the oil will drop to zero. In amount, the reserve oil represents a volume corresponding to a movement of the floating piston of about % inch or exactly the same as the travel of the oil index between its extremes of movement.
(2)	In determining the nitrogen pressure, the inspector is actually measuring the pressure on the oil transmitted to it by the compressed gas through the medium of the floating piston.
(2T) The oil, in passing from the vicinity of the pressure gage to the vicinity of the floating piston, or vice versa, must pass through very small orifices. Because of the resistance offered in these orifices, if the recoil piston jack is operated rapidly in either direction, a misleading pressure will be generated in the vicinity of the gage and registered thereon. For this reason the recoil piston jack screw must be operated at not over four turns per minute.
(4)	The oil within the mechanism becomes sluggish at a low temperature. Its action through the small orifices is, therefore, erratic
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and the reliability of the gas pressure measurements under such conditions is always doubtful. Therefore, if pressures must be taken in cold weather, it is necessary that the recoil mechanism and extra oil be in a room warmed to at least 50° F. for 24 hours preceding the test.
(5)	Since the amount of gas originally placed in the mechanism cannot increase, the pressure at any given temperature cannot become higher except by moving the floating piston forward so as to reduce the volume of the gas chamber. This can be accomplished if an excess of oil is introduced, as may be the case if the oil index is stuck and the sticking is not noticed. Make sure the oil index is registering properly by draining off some of the reserve oil and then restoring it. The oil index will move in when the oil is drained and should move out as the reserve is reestablished. Failure of the oil index is almost invariably on the outward movement.
(6)	If gas leaks past the floating piston, it may be detected by the foamy appearance and the sputtering of the oil when draining off the reserve oil.
(7)	Place the bottom sleigh (recoil mechanism) in a horizontal position. Remove the filling and drain plug located in the yoke and connect the oil release, B103913 (fig. 6). As the oil release is screwed in, the reserve oil is released and should be caught in a suitable receptacle. The reserve oil should be allowed to flow until the flow of oil practically ceases. The oil index should move inward beyond the face of the oil index follower.
(8)	Place the thermometer in the reserve oil drained from the mechanism and make a record of the temperature. Keep the thermometer out of the sun. This should represent as accurately as possible the temperature inside the recoil mechanism.
(9)	Attach the adapter of the pressure gage to the oil release at (2) and recoil cylinder filling plug, A18495, at (4) (fig. 6). The gage should be turned to a convenient position for reading. Make all joints tight except joint (4) which should be slightly loose for the purpose of “purging” (removing all air from the line). Purge the line by forcing piston to the rear by means of the jack (about two turns of the handle) and tighten connection (4).
b.	To determine gas pressure of mechanism and friction of floating piston.— (1) Remove screw, BCAX1AC, from the recoil cylinder and unscrew recoil cylinder rear head, B17563 (fig, 12), assemble cap (8) (fig. 6) of the recoil piston screw jack, B102874, firmly against the recoil cylinder with the nut (7) tightened. Move the recoil piston to the rear by means of the recoil piston screw jack until a
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pressure of approximately 1,250 pounds per square inch is registered on the pressure gage.
(2)	Turn the screw of the jack 10 complete revolutions and, while slowly making the tenth revolution, read the pressure gage, tapping the gage lightly to overcome the effect of friction in the gage itself. This gage reading represents the gas pressure plus the friction of the floating piston (AP + F). (Make a note of the gage reading.)
(3)	Continue turning the jack screw five more revolutions, then reverse the direction of the jack screw, unscrewing for five revolutions, moving slowly on the fifth revolution, and read the gage the second time. This reading represents the gas pressure minus the friction of the floating piston (AP — F). (Make a note of the gage reading.)
(4)	The gas pressure in the mechanism is one-half the sum of the high and low readings.
(AP+F) + (AP-F)
2
Example :
Atmospheric temperature, 70° F.
Gage reading, (2) above—1,435 pounds per square inch.
Gage reading, (3) above—1,065 pounds per square inch.
Add these gage readings together—2,500.
Divide the answer by 2—1,250.
1,250 pounds per square inch is the gas pressure of the mechanism.
(5)	It must be remembered that it is the sliding friction of the floating piston and not the standing friction that is to be deducted. Therefore, the floating piston must be in motion when a reading is taken on the pressure gage.
c.	To correct pressure for temperature variation.—(Volume of air chamber remains constant. With the gun in battery, the pressure varies directly as the “absolute” temperature.) Recoil mechanisms are charged with nitrogen gas at a pressure ranging from 1,250 to 1.265 pounds per square inch at 70° F. temperature (reserve oil off).
(1)	To make corrections in pressure, due to change in temperature, the following formula may be used:
Py T,
E (volume remaining constant.)
*2	* 2
Where, Pv = initial pounds per square inch absolute pressure.
P2 = final pounds per square inch absolute pressure.
7’1 = initial absolute temperature.
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7^ = final absolute temperature.
Pounds per square inch absolute = gage pressure+14.7. Absolute temperature = degrees F. + 460.
(2)	Since atmospheric pressure is small compared to the high pressures in the recoil cylinder, gage pressures may be substituted for absolute pressures in this formula without appreciable error. Substituting the initial conditions (7*5 = 1,250 pounds per square inch and 771=70+460=530°F.) gives the following formula:
Pt= (460+t)X 2.36
Where, Pt = gage pressure in pounds per square inch at £°F.
t= temperature, ° F., of the oil (and recoil mechanism).
Example.—What is the pressure at 85° F. when the mechanism was originally charged to 1,250 pounds per square inch at 70° F.?
25=85°.
7*t = (460 + 85) X 2.36 = 1,285 pounds per square inch.
(3)	The correct pressure at various temperatures may be found by referring to the table below. It will be noted that for each °F. change in temperature there is a corresponding change of approximately 2.36 pounds per square inch in pressure.
Temperature ° F.	Pressure (pounds per square inch)	Temperature 0 F.	Pressure (pounds per square inch)	Temperature ° F.	Pressure (pounds per square inch)
-5	1,073	45	1,191	95	1,309
0	1,085	50	1,203	100	1,321
5	1,097	55	1,215	105	1,333
10	1,108	60	1,226	110	1,344
15	1,120	65	1,238	115	1,356
20	1,132	70	1,250	120	1,368
25	1,144	75	1,262	125	1,380
30	1,156	80	1,274	130	1,392
35	1,168	85	1,285	135	1,403
40	1,179	90	1,297	140	1,415
Note.—The recoil mechanism is considered serviceable with a variation of plus or minus 50 pounds per square inch. If not within these limits, the condition of the recoil mechanism must be reported to the Chief of Ordnance.
d.	To determine friction of floating piston.— (1) The difference between the first reading (AT’+T’), &(2) above, and the second reading (AP—F), &(3) above, represents double the friction of the floating piston.
(AP+F)- (AP-F)
F-----------2--------
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Example:
Gage reading, 5(2) above—1,435 pounds per square inch.
Gage reading, 5(3) above—1,065 pounds per square inch.
Subtract the second gage reading from the first gage reading. The result is 370 pounds per square inch or double the friction of the floating piston. Divide 370 by 2 and the result is 185 pounds per square inch, which is the friction of the floating piston.
Note.—The operation of determining the friction of the floating piston should be repeated until uniform results are obtained.
(2)	The friction of the floating piston and the friction of the recoil piston and recoil piston rod stuffing box in mechanisms that have been assembled for considerable periods of time will increase to a high friction owing to the absorption of oil by the packings. The normal pressure to overcome the friction of the floating piston is 185 pounds per square inch. The friction of the floating piston may vary between the limits of 150 and 250 pounds per square inch. If not within these limits, the condition of the recoil mechanism must be reported to the Chief of Ordnance.
e.	To determine friction of recoil piston and recoil piston rod stuffing box.— (1) Withdraw reserve oil as outlined in  inches of thread should be exposed.
c.	When the effort required at the elevating crank to elevate and depress at all points in the elevating range are as nearly equal as possible, assemble the equilibrator pin lock and remove the equilibrator locking tool.
d.	It will be noted that the pressure on the equilibrator spring when restrained by the equilibrator locking tool is about 1,450 pounds. Replace the equilibrator spring with caution. The free height of the spring is about 34 inches; consequently, the stem and barrel are separated until the spring has been compressed 7% inches to a load of about 640 pounds.
15.	Dismounting of cradle (75-mm howitzer carriage, M2A1, M3, and M3A1).—a. To remove top sleigh, howitzer, and bottom sleigh from the carriage, assemble the equilibrator assembling
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bolt (fig. 2) by inserting it through the hole in the equilibrator barrel socket formed on the top carriage and through the equilibrator barrel of each equilibrator until the assembling bolt comes in contact with the equilibrator spring guide tube plug, A140626 (fig. 11). Then screw the assembling bolt into the plug, A140626, and elevate cradle until equilibrator is free.
b. Remove the cradle trunnion pins and lift the cradle free of the carriage.
16.	Disassembly of elevating and traversing mechanism (75-mm howitzer carriage, M2A1, M3, and M3A1).—a. In the disassembly of parts pertaining to the elevating and traversing mechanism, care must be taken to remove all locking screws before an attempt is made to disassemble any parts of the mechanism which may be covered by paint.
ft. In the removal of ball or roller bearings, it should be noted that in most cases the cup of the bearing is a tight fit. Therefore, provision should be made before their withdrawal to have suitable tool equipment to do the work. This equipment is to be designed and made by the ordnance maintenance company.
17.	Dismounting top carriage (75-mm howitzer carriage, M2A1, M3, and M3A1).—a. Remove the cotter pin, BFAX2AN (fig. 9), and the pintle pin nut, A142519. Remove the pintle pin, C60295, from its bearing being careful that the key of the pintle pin does not score its keyway.
I). Remove the cotter pins in the flexible joint, A138006 (fig. 9). Remove the screws, BCBX1CB, from the traversing gear case and then remove the case. Slide the top carriage to the rear and remove it from its seat on the bottom carriage.
18.	Removal of spring carrier (75-mm howitzer carriage, M2A1, M3, and M3A1).—a. Disassembly of spring carrier of the M3 carriage.—(1) Place the carriage in firing position. Remove the disk and rim wheel, with tire assembly. Remove the wheel hub assembly, with brake drum and roller bearings. Remove nut, BBHX2A (fig. 10), from the wheel carrier pin. Remove the wheel carrier assembly from its bearing in the bottom carriage.
(2)	Remove the six nuts, BBAX1A (fig. 10), from screws, BCKX2CK, in the spring carrier cover. Remove the hexagon nut, BBAX2D, from the spring carrier shaft, B108606, and then remove the shaft and bushing, A140586. Remove the spring carrier from the wheel carrier.
(3)	Remove the spring carrier cover assembly and then assemble the spring compressor through the opening for the spring carrier
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shaft. Assemble the spring compressor nut and compress the spring carrier compression spring, A140597 (fig. 10), slightly.
(4)	Remove the safety set screw in the spring carrier bracket buffer cap, A140600 (fig. 10), from the spring carrier bracket, D7272 or D7273. Unscrew the spring compressor nut until all tension on the spring carrier compression spring is released, then remove the spring compressor and disassemble the parts in the spring carrier bracket.
b. Assembly.—This should be performed in the reverse order of disassembly.
19.	Disassembly of brake mechanism.—In order to gain access to the brake assembly of the 75-mm howitzer carriages, M2A1, and M3, it is necessary to remove the disk and rim wheel with tire assembly, hub cap, outer wheel spindle nut, and parts that retain the wheel hub assembly, brake drum, and roller bearing in position. Instructions for the disassembly of the brake mechanism will not be required, due to the simplicity of the design and ease of disassembly and assembly.
20.	Special repair tools.—Pressure gages become inaccurate through the accidental movement of the hand upon the spindle and from wear or distortion of the linkage. In using the pressure gage, if pressure is applied or released too suddenly, the hand may strike the stop pin and be moved on the spindle. Repairs consist in pulling of the hand with the gage hand jack and resetting it with the gage hand set in agreement with the master pressure gage when the gages are being tested by the pressure gage tester. Master gages should be returned to an arsenal periodically for verification of their accuracy.
21.	Light caisson, Ml, and light limber, M2.—Maintenance and adjustment as outlined in TM 9-320 should be followed. No detailed instructions will be given for disassembly or assembly as the design and construction of the vehicle is not complicated.
Section V
TOOLS FOR MAINTENANCE AND REPAIR
Paragraph
Chest, tool, special repair______________________________________ 22
Tool, driving hub liner__________________________________________ 23
Bolt, equilibrator, assembly_____________________________________ 24
Compressor, spring (for M3 carriages having spring carriers only)_ 25
Puller, gear (for M2, M3, M3A1 carriages)_________________________ 26
22.	Chest, tool, special repair.—a. The special repair tools pertaining to the 75-mm pack howitzer, Ml, and M1A1, and 75-mm pack
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howitzer carriage, Ml, and howitzer carriages, M2A1, M3, and M3A1, are carried in chest, D5433 and chest, D32123, respectively, and listed in Standard Nomenclature List No. C-18. The space occupied by chest, D5435, is 1.508 cubic feet, the dimensions being 20% inches long, 12% inches wide, and 10 inches high. The chest, D32123 (fig. 1), occupies a space of 2% cubic feet, the dimensions being 27% inches long, 12% inches wide, and 12%6 inches high.
b. A number of these tools are provided for maintenance, repair, and inspection of this materiel, such as chisels, drifts, files, hammers, pliers, screw drivers, punches, and wrenches, the names or general characteristics of which indicate their uses and application. Therefore, detailed description and methods of use thereof are not outlined herein. Those tools, however, which are of special design and not commonly used are described and their uses outlined below.
23.	Tool, driving hub liner.—The purpose of this tool is to facilitate the removal of hub liner from the wheel hub of the pack howitzer carriage, Ml. It is a bronze casting, cylindrical in shape, and is 4% inches long.
24.	Bolt, equilibrator, assembly.—The assembly bolt (fig. 2) is 22 inches long, is threaded %-13NC-2 on one end, and the other end is knurled a distance of 1% inches. The purpose of the bolt is to facilitate the assembly of equilibrator of the howitzer carriages, M2A1, M3, and M3A1, and to retain the equilibrator as an assembled unit when making adjustments or when replacing the equilibrator in its bearing on the carriage.
25.	Compressor, spring (for M3 carriages having spring carriers only).—The spring compressor (fig. 3) is composed of a %-inch threaded bolt, 12% inches over-all, and a %-inch special nut. The purpose of the spring compressor is to facilitate the assembly and disassembly of the spring carrier group assembly.
26.	Puller, gear (for M2, M3, M3A1 carriages).—The gear puller (fig. 4) consists of a plate and three screws, two of which have nuts. Its purpose is primarily to remove the elevating worm wheel, B109828 (carriages, M3, and M3A1) (fig. 8), and traversing worm wheel, B108549 (all carriages) (fig. 9), from their shafts.
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Figure 1.—
■Chest, tool, special repair.
319780°—41---3
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18
RA FSD 1348
Figure 2.—Bolt, equilibrator, assembling.
n aB0LT-AI4I226	NUT-AI4I227_4*~^
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RA FSD 1348
Figure 3.-—Compressor, spring.
Reference	Item
A141226	Bolt, spring compressor.
A141227	Nut, spring compressor bolt.
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Reference A140831 BBGX1B BFAX1BE A140832 BCFX2ER
SCRE W - AI40832 —
B0DY-AI4083I--SCREW-BCFX2ER
NUT- 88 G XIB	MpPIN -BFA XIBE
1	D
U	ILJl	RA FSD 1348
Figure 4.—Puller, gear.
Item
Body, gear puller.
Nut, slotted, s-fln., ^o-18NC-2.
Pin, cotter, split, S., Jds by %.
Screw, cap, hex-hd., ^-HNC-2 by 2J4.
Screw, mach., oval-fil-hd., S., 54a-18NC-2 by 2.
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___jBi.
S	V	t j
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JB	(2)	(S'*
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4
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g pressure gage.
Figure 5.—Tools used for testing and repairins
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TEXAS STATE COLLEGE FOR WOMEN LIBRARY TM 9-1320
26
Reference 1—24-15-7 2—TKKX2II 3—A442 4—15-5-511P 5—B748 6—24-15-10F 7—24-15-9D 8—24-15-10D 9—24-15-10Q 10— 24-15-10L 11—A1715
Item
Tester, pressure gage.
Wrench, engrs., dble-hd., opngs. (alloy-S.).
Jack, gage hand.
Set, gage hand.
Gage, pressure, master.
Gaskets, adapter (gage, reservoir and adapter) (spare).
Gasket, piston (spare).
Adapter.1
Adapters.
Gasket, oil reserve (spare).
Glasses, pressure gage (spare).
1 Furnished with all pressure gage tester outfits but used with the 155-mm and 240-mm howitzer materiel only.
21
ORDNANCE DEPARTMENT
TM 9-1320
2Q
□
y—ADAPT er-AI5720	\ vM?	J d /
__________H--K----k
-CIE~-..............rt *
t.v.'d1—y	@	j—p
OIL SCREW FILLER, M3-C673I	• HANDLE-BI3909	T	A..
(7J	HANDLE-A369I	PRESSURE GAGE - C6385
r-f—T-j	©
er	C/
SCREW JACK-BI02874	1—[_—| 1
____	PLUG- A 18495
1-----------U____J	RA FSD 1350
OIL RELEASE - BI039I3
Figure 6.—Tools for manometer tests.
99,
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference
A15720
C6731
C6385
B13909
A3691
B102874
A18495
B103913
Item
Adapter, oil screw filler, M3, with screw (BCUX2FK)
Filler, oil screw, M3, with adapter.
Gage, pressure.
Handle, assembly.
Handle.
Jack, screw, recoil piston.
Plug, filling, recoil cylinder.
Release, oil.
23
TM 9-1320
26
ORDNANCE DEPARTMENT
xq	CRADLE a SLEIGH FOR 75-MM PACK HOWITZER CARRIAGE Ml
(	Tf 1----------------STEM-A2O726	_/“NUT-BBDXIC
I ifLj-'i I	T0P sleigh	^ -bushing-assso	screw-a 37305
---- --—S---------------------A	vL_AXk'PLUNGER-A37304
xsrs!u£;B	-----\O	SPRING-A 37302
’	A |	|A j px	SECTION C-C
rr^F~Tj ?	[—I---- ^^TTl	SHAFT-A37I40---------->
fej	// Z/ q X__——----------------	Y -T—T- cpa-c KN0B-AI9320----------------.	\
(	1	_____________Q I —lc=4= /Xj	pin-bfcxibd-------.k-g.. --v
p p—I g] Xj-------------------/“lJA---------------------	~7z|r$^|	SPRING-A37I42----W^FtTH
vilriLf?^ fl @MkT|rQ	II || ZZzV, QllmJ n nSCREW-A20728
J	___ fir FTFd tU-H B ( t \	SECTION B-B
II----t—---------------th--------- —F—B~Vy—IP
L LATCH-BI7569	L.CRADLE	/ SCREW-BCBXICD - -	L» J
rWASHER-BECXIH	BOTTOM SLEIGH------	/ BRACKET-07100-------
----[SCREW-A2O725	SUPPORT-856581-------------------------/	\PIN-A3872	LCAiyi-BI04254 STOP-A5716"	__ SCREW-BCB^IBG ----------------------'	sec?™ a-a
SCREW-BCCXIAAl	WASHER-BECXIH|	Im—_________________LATCH-AI8873
________-—'	s	---------TH0NG-AI7950
----x _______---------	A Wf| 2x1	PIN-BFCXlN^n
—-—SCREW-AI585I	fX-fl—Y	_______„_________________1 VX-X-O-1 |[ t SCREW-AI4I5OoH jCX
, GASKET-AI8496 jz~T H XX	~ * . r ^1--------'—SCREW‘AI4l50lx\_
\ RETAINER-BI05276 // ULf	- £ =!OkxT|
/OZ-Yore Fib	ii ;	~	I	\WraN~1
INDEX-AI5893 V I	___ VIA J if/Wl
—--------—'Hj—1—--------------------------------------। o-MrV
[—--------HANDLE-AI343 u	XXi Til	TH
,-----INDICAT0R-AI9262	=^J*' VS/	“ MV------------KEY-AI40465
/ /---SPRING-AI344	”	SCREW-BCBXIEDI	\\	x—x	x SHAFT-BI09I89 A
/Zx- BRACKET-BI04820	CRADLE a SLEIGH FOR	WASHER-BECXJMl	XZ	MX	x<\	RETAINER-A38068 \	M
rgxvX [SCREW-BCBXIAD	75-MM HOWITZER CARRIAGE. M2 Al.	ARC-C59570	-——————Q? A	SPRING-AI44523 V
' \M WASHER-BECXIG	75MVIM HOWITZER CARRIAGE, M3 a	ST0P-AI405I9 I______________PIN-BFDXIBC
|nUT-BBBXIA 75MM HOWITZER CARRIAGE, M3AI SCREW-BCFX2BK|	' P|N.BFCX|N
lT
\	RA FSD
ISECTIQN ON RIGHT SIDE SHOWING	U
RECOIL INDICATOR
Figure 7.—Cradle and top sleigh (left and rear view).
J
24
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference C59570 B104820 C7100 A 3580 B104254 A18496 A1343 A15893 A19262 A140465 A19320 A18873 B17569 BBDX1C BBBX1A BFDX1BC BFCX1N BFCX1BD A3872 A37304 B105276 A38068 BCBX1AD BCBX1BG BCBX1CD BCBX1ED BCCX1AA A15851 A20728 A37305 A141501 BCFX2BK A20725 A141500 A37140 B109189 A1344 A37302 A144523 A37142 A20726 A140519 A5716 B5658 A17950 BECX1G BECX1H BECX1M
Item
Arc, elevating, assembly.
Bracket, recoil indicator.
Bracket, sight.
Bushing, cam.
Cam, top sleigh clamping.
Gasket, recoil cylinder filling plug.
Handle, recoil indicator.
Index, oil.
Indicator, recoil.
Key, elevating arc.
Knob, sight retaining shaft.
Latch, clamping, top sleigh.
Latch, piston rod.
Nut, jam, hex., s-fin., %-24NF-2.
Nut, reg., hex., s-fin., J4-28NF-2.
Pin, stght., 8., %2 by Ji.
Pin, taper, No. % (0.109) by 1.
Pin, taper, No. 0 (0.156) by 1J4.
Pin, top sleigh clamping latch.
Plunger, sight socket.
Retainer, recoil cylinder filling plug.
Retainer, spring.
Screw, cap, nex-hd., J4-28NF-2 by 1J4.
Screw, cap, hex-hd., Mo-24NF-2 by 2.
Screw, cap, hex-hd., %-24NF-2 by 1J4.
Screw, cap, hex-hd., Ji-20NF-2by 1J4.
Screw, cap, oval-fil-hd., J4-20NC-2 by
Screw, fl-hd., S., .164-36NF-3 by Ji.
Screw, hdls , fl-pt., S., %-24NF-3 by ?i.
Screw, hdls., rd-pt., 8., Ji-24 NF-3 by J4.
Screw, hdls., rd-pt., S., Ji-24NF-3 by Ji.
Screw, mach., oval-fil-hd., 8., No. 10 (0.190)-24NC-2 by ft.
Screw, piston rod latch.
Screw, sight clamping.
Shaft, retaining, sight.
Shaft, sight retaining.
Spring, compression, 0.035 diam. stock, .28 O. D., 8 coils.
Spring, compression, 0.063 diam. stock, .375 O. D., 6 coils.
Spring, torsion, 0.055 diam. stock, .60 O. D., 13 coils, R. H
Spring, torsion, 0.062 diam. stock, .62 O. D., 8Ji-L-coils.
Stem, piston rod latch.
Stop, elevating.
Stop, recoil cylinder.
Support, cylinder.
Thong, latigo lea., Mo by 9 by Ji thick, both ends slit.
Washer, lock, reg., J4 by Ji2 by >4«.
Washer, lock, reg., Mo by H by J4o.
Washer, lock, reg., Ji by 1 Jir by Ji.
Yoke.
25
TM 9-1320
26
ORDNANCE DEPARTAIENT
SCREW - A18498--------\
RETAINER-8103539-----x \
,.-ySCREW-BCFX2AF	\\
/ FITTING-CLDXIA-----------x \\
!lX	'tlL_/ WASHER-AI36639-------------------<\	\
FITTING-CLDXIA-------------------------------------------WHEE L* BI09828	Afltt
GLAND-AI438I2 --------------------SCREW-BCUXIFG	—----, ;}•
/	I I ["I	'"-COVER-A142476	{J
/	‘.|j H	—J0INT-AI38006	! jj
SCREW-BCUXIFG----'~Z	I	[SCREW-BCBXICB	J
'j V\	| WASHER-BECXIK
/—GLAND-AI57072
,! ■ AW'"	—F0LL0WER-AI5707I
i r^XkXr^'HANDWHEEL~ 02247
yjPIN-BFAXICR
Hnut-bbfxie	oa
--	RA FSD 969
Figure 8,—Elevating mechanism (755-mm howitzer carriage, M2A1, M3, M3A1).
26
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference A142476 CLDX1A A157071 A143812 A157072 C2247 A138006 BBFX1E BFAX1CR B103539 BCBX1CB A18498 BCFX2AF BCUX1FG A136639 BECX1K B109828
Item
Cover, elevating gear case.
Fitting, lubr., b-hd. type, stght., Ji-27NPT, male.
Follower, packing.
Gland, elevating gear case.
Gland, retaining.
Handwheel, 6.5 in., assembly.
Joint, flexible.
Nut, castle, Ji-2ONF-2.
Pin, cotter, split, S., %2 by 1J4.
Retainer, ball bearing.
Screw, cap, hex-hd., %-24NF-2 by Ji.
Screw, hdls., fl-pt., S., Ms-24NF-2 by Ym.
Screw, mach., oval-fll-hd., S., No. 8 (0.164)-32NC-2 by Ji.
Screw, set, hdls., fl-pt., cor-res-S., No. 10 (0.190)-32NF-3 by Vie.
Washer, felt, hard, wool, 2Ji2 I. D. by IJi O. D. by thick.
Washer, lock, reg., ?i by Ji by %2.
Wheel, worm, elevating.
27
TM 9-1320
26
ORDNANCE DEPARTMENT
r-SCREW-A 18498
\r—RETAINER-8106970
lh=CJl
\\v-JOINT-A 138006	/ y^W"
\ Wrack-C59562	/ \vjt
\ ST0P-AI58I26	/	\\ HHANDWHEEL- C2247
^-FITTING-CLDXIA	/	\\ [PIN-BFAXICR
JWASHER-BECXIKl /	\\HnUT-BBFXIE
/iSCREW-BCBXICBJ	y~FOLLOWER-AI5707I
WHEEL BI08549 x	/	FITTING-CLDXIA
NUT-BBHXIB1_ \	/	"
pin-bfaxipk]	\ \ /_
C0VER-AI40509-pH
SCREW-BCBX5B	JSOr	hWiW	ll_
washer-beaxihI—i Mtn P N C60295
\	>1 H	IW—PIN-BFAX2AN
75*fSl&!’ty
COVER-A140508--
^=—RA FSD 963
Figure 9.—Traversing mechanism (75-mm howitzer carriage, M2 Al, M3, M3A1).
28
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference A140509 A140508 CLDX1A A157071 C2247 A138006 BBFX1E A142519 BBHX1B BFAX1CR BFAX1DK BFAX2AN C60295 C59562 B106970 BCBX5B BCBX1CB A18498 A158126 BECX1K BEAX1H B108549
Item
Cover, traversing gear ease, large.
Cover, traversing gear case, small.
Fitting, lubr., b-hd. type, stght., J4-27NPT, male.
Follower, packing.
Handwheel, 6.5 in., assembly.
Joint, flexible.
Nut, castle, J^-20NF-2.
Nut, pintle pin.
Nut, slotted, s-fln., |k-18NF-2.
Pin, cotter, split, S., %2 by 1J4.
Pin, cotter, split, S., Ik by 1J^.
Pin, cotter, split, S., Ma by 4.
Pin, pintle.
Rack, traversing.
Retainer, ball bearing.
Screw, cap, hex-hd., J4-28NF-2 by Vi.
Screw, cap, hex-hd., %-24NF-2 by Jk.
Screw, hdls., fl-pt., S., Ma-24NF-2 by Ma.
Stop, traversing.
Washer, lock, reg., % by J4 by ?kz.
Washer, lock, “Shakeproof No. 12 type,” J4-in.
Wheel, worm, traversing.
29
TM 9-1320
26
ORDNANCE DEPARTMENT
r-FITTING-CLDXIA	SCREW-AI37994-----\
/ [NUT-BBAX2D	NUT-AI37462-------
/ /] WASHER-BE AX3K	SCREW-BCBXiEtFI_	SPRING-AI37995----\\\
// [CARRIER (LEFT)-D729I	WASHER -BECXIMl \	NUT-BBBXIC---------\
/CARRIER (RIGHT1-07304	WASHER-AI37920] \	^CRANK-AI405I6	'X\\
I WASHER-BEAXIN I	NUT-BBHXIC I---\	/ [SHAFT (LEFT)tBI08597	'	'
I NUT-BBAXIA_|	\	,,	PIN-BFAXIDK_J '	/ / SHAFT (RIGHT)-BI08598	\ Z\X\
\ -\	rSCREW-BCKX4AE	'	FITTING-CLDXIA	V —L _ •// RACK----—--------------X
X / // /r CAP, BUFFER	'WASHER-AI4O573 X *-	[PIN-AI40569	,	:
L	BUFFER'AI40584	H__NUT-BBHX2A	~“'X>‘|PIN-BFAXIDF	■' , X'
I ~~ '5 ’ WXsCREW-BCTX'BF	~1 r — IPIN-BFAX2AC	X4 LEVER-C59579------------•	''X'X"
' ' 0 ^XbUSHING-AI40586	• — ‘-J - -	« SCREW-AI38042------// l L, -____1 \
. .X------SHAFT-8108606	:	,	[ I „ WASHER-BEBXIMl_______II l(~)''1 I
\	--SPRING-AI40597	| H jT(p)~	° PIN-BFAXIDF |	1	7
sf - X pX-FITTING-CLDXIA	r* BAND-------------------~\j - i 1Z
■ \XX*^^CAP’BRACKET / cX11"''	nut-bbbxia---------_____
x [NUT-BBGX2D	/	\	/ y SCREW-AI37598------------,1’	\
\ [PIN-BFAXIDL ,	/	\	/	/	\
\ BRACKET (RIGHT) /	X	/	/	\
\ BRACKET (LEFT)	\	/	/	\
U-SPRING CARRIER FOR 75 MM HOWITZER CARRIAGE M3-BRAKE MECHANISM FOR 75 MM HOWITZER CARRIAGE M3_\
RA FSO 967
Figure 10.—Spring carrier (75-mm howitzer carriage, M3).
30
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference	Item
D7273 D7272 A140584 A140586 A140600 A140588 D7291 D7304 B141737 A140516 CLDX1A C59579 A137462 BBAX1A BBBX1A BBBX1C BBAX2D BBHX1C BBGX2D BBHX2A BFAX1DF BFAX1DK BFAX1DL BFAX2AC A140569 B144340 A137994 A138042 BCBX1ED A137598 BCKX4AE BCKX2CK BCTX2C B108597 B108598 B108606 A137995 A140597 A140573 BECX1M BEAX1H BEAX3K BEBX1M A137920	Band. Bracket, left. Bracket, right. Buffer, spring carrier spring. Bushing, spring carrier shaft, upper. Cap. Cap. Carrier, wheel, left, assembly. Carrier, wheel, right, assembly. Cover, spring carrier, assembly. Crank, brake band. Fitting, lubr., b-hd. type, stght., Ji-27NPT, male. Lever, hand brake, group assembly. Nut, brake band adjusting. Nut, reg., hex., s-fln., J4-20NC-2. Nut, reg., hex., s-fin., J4-28NF-2. Nut, reg., hex., s-fin., Ji-24NF-2. Nut, reg., hex., s-fin., Ji-9NC-2. Nut, slotted, s-fin., J4-16NF-2. Nut, slotted, s-fin., Ji-9NC-2. Nut, slotted, s-fin., lJi-12NF-2. Pin, cotter, split, S., Ji by Ji. Pin, cotter, split, S., Ji by 1 Ji. Pin, cotter, split, S., Ji by 1%. Pin, cotter, split, S., Jis by 2J4. Pin, rod end, 5i in. diam. Rack, brake ratchet. Screw, adjusting, brake band. Screw, brake band anchor. Screw, cap,hex-hd., Ji-20NF-2 by 1J1. Screw, fil-hd., S., J4-28NF-2 by Ji. Screw, mach., fl-hd., br., No. 10 (0.190)-24NC-2 by Ji. Screw, mach., fl-hd., S., J4-20NC-2 by 1. Screw, set, socket-hd., rd-pt., alloy-S., J4-20NC-3 by Ji. Shaft, brake, left. Shaft, brake, right. Shaft, spring carrier. Spring, compression, .08 diam. stock, 1 Jf o O. D., 15 coils. Spring, compression, 1-%2 diam. stock, 2	O. D., 8 coils. Washer, bz., 1 -Jfl2 I. D. by 2>i O. D. by 0.125 thick. Washer, lock, reg., Ji by 1J64 by Ji. Washer, lock, “Shakeproof No. 12 type,” Ji-in. Washer, lock, “Shakeproof No. 14 type,” Ji-in. Washer, plain, S., Ji (SAE std.). Washer, S., 2%2 I. D. by l?i O. D. by Ji thick.
31
TM 9-1320
26
ORDNANCE DEPARTMENT
TUBE-AI40625 — PLUG-AI4O626-PIN-BFDXIEZ---
SPRING -.AI36543
TUBE-BIO863I — BARREL- BI08630
SCREW-BCNX2AA LOCK-A3552
---PIN-AI58054
CAP-BI45I45 SCREW-BCTX2C
< f
Reference B108630 B145145 A2552 A158054 BFDX1EZ A140626 BCNX2AA BCTX2C A136543 B108631 A140625
RA FSD 1351
Figure 11.—Equilibrator, assembly (75-mm howitzer carriage, M2A1, M3 and M3A1).
Item
Barrel, equilibrator.
Cap, equilibrator.
Lock, equilibrator pin.
Pin, equilibrator trunnion, bent.
Pin, stght., S., 3Ao by 1?4.
Plug, equilibrator spring guide tube.
l Screw, mach., rd-hd., S., No. 10 (0.190)-24NC-2 by J4.
Screw, set, socket-hd., rd-pt., alloy-S., J4-2ONC-3 by J4.
Spring, equilibrator, Ji6 diam. stock, 3?-f8 O. D., 40 coils.
Tube.
Tube, equilibrator spring guide.
SCREW- BCAXIAC —------------
HEAD-8103501	L0CK-AI63O56 —------------
-PLUG-AI8I77	HEAD-BI7563-----:------
[-Y0KE-D3859	-<-OIL	HEAD-AI5872---------,
__z—'	w Turn fi?ompressed pi-.T i jirn
,	j r fe J I.” Jj! N H
HEAD -C58O3	HEAD- BI7669------
FLOATING PISTON ASSEMBLY----------------- COVER-AI589I
Reference A15891 C5803 A15872 B103501 B17563 B17669 A163056 A18177 BCAX1AC D3859
Figure 12.—Diagram of recoil mechanism. Item
Cover, recuperator cylinder.
Head.
Head, piston.
Head, recoil cylinder, front.
Head, recoil cylinder, rear.
Head, recuperator cylinder, rear.
Lock, recoil cylinder.
Plug, purge.
Screw, cap, hex-hd., J4-20NC-2 by 1.
Yoke.
RA FSD 1352
32
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
I— SPRING-AI5899
— GLAND-AI5897
---PACKING-AI5898
----GLAND-AI5897
----FOLLOWER-A135611
Figure 13.—Oil index.
RA FSD 1353
Reference
A135611
A15897
A15898
A15899
Item
Follower, oil index.
Gland, oil index.
Packing, oil index.
Spring, Belleville, oil index packing.
HEAD-AI5872
----PIN-AI5856 r—WIPER-AI587O
SeS
----------E----
SCREW-BCDX2AA
DISK-AI5869 flilQL SBARA FS01353
Figure 14.—Recoil cylinder wiper.
Reference
A15869
A15872
A15856
BCDX2AA
A 1.5870
Item
Disk.
Head, piston.
Pin, recoil piston disk.
Screw, cap, fl-hd., J4-20NC-2 by Wiper, recoil cylinder.
33
TM 9-1320
26
ORDNANCE DEPARTMENT
( (
J i
c f r
SCREW- BCUX2EG- -GASKET-A6370
PLUG-AI8495-r	Fl -VALVE-AI9763
-----PLUG-AI8I77	k	i RETAINER-BI05276;/‘/4CjN.	i --SPRING-AI9764
r-YOKE-D38S9	-GASKET-AI8I76	< /	'
<—GASKET-AI423
,	I	!-CYLINDER
i . ■	‘ r,
GASKET-AI8496—A/ /
___'	_________________________ HOUSING-BIO5275-AV \y	>j-1-
) GASKET-AI9767-A A	/A	\
-----------T
--------------------------L
A-I----------CYLINDER	I_I	V.T \
Lj.J LGASKET-AI422	4-A-"^
I—WASHER-BECX IM A '-----------PLUG-AI8305
SECTION A-A	-SCREW-BCBXIED
RA FSD 1354
Figure 15.—Recoil cylinder filling valve.
34
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference
A18176
A1423
A18496
A19767
A6370
A1422
B105275
A18305
A18496
A18177
B105276
BCBX1ED
BCUX2EG
A19764
A19763 BECXIM 143859
Item
Gasket, purge plug.
Gasket, recoil cylinder.
Gasket, recoil cylinder filling plug.
Gasket, recoil cylinder filling valve.
Gasket, recoil cylinder filling valve housing.
Gasket, recuperator cylinder.
Housing, recoil cylinder filling valve.
Plug, pipe, 8., sq-hd., %-in.
Plug, filling, recoil cylinder.
Plug, purge.
Retainer, recoil cylinder filling plug.
Screw, cap, hex-hd., J4-20NF-2 by 1J4.
Screw, set, hdls., cone-pt., eor-res-S., No. 5 (0.125)-44NF-3 by ?6.
Spring, compression, 0.078 diam. stock, .472 O. D., 6’A coils.
Valve, filling, recoil cylinder.
Washer, lock, reg., H by by J4.
Yoke.
35
c (
r (
c t r r
TM 9-1320
26
ORDNANCE
DEPARTMENT
3G
‘NUT *A3323
___SPINDLE- A3324
----SPRING-A3347
rfl F j	—------LATCH-A 3341
*	---C ON N E C TI ON - A 3321	---W ORM - A16
r~7~	"	" ’ "‘	--1	---> SCREW-BCKX2DKI	— SCREW‘BCLX3ED
^^L|i|'LLZ^ VZj	f]	Q I j NUT-BBAXIB |-------------
HOOK. RIGHT-BI03545—-"--------------------------- ■?' ~ "	) ll	I SCREW-AI858O	'P/fy '
ROCKER, RIGHT  ----xZ
' TRAIL. FRONT	- -k HOUSING	.?(&—/
---------------------------------------------—------ ■	~L ~l/ PiN-BFAXIEK________1 f	T '/ ---------------- _'7> «jWnWmrnm+^F 	1 ™:“X_______________I ROCKER. LEFT----+(—+	i «	-------+==—~? I I	J_________________________PIN-BFAXIEKf	(+JJ + 4>\
HOOK, LEFT-85588----AvI	. M	/	lllll LINK-A869O	I -A \
___________________...............................................................Jo	I
X/' /______________L—XX3..........................................................inn PLUNGER-86832	T~M 1----|R--
PIN-A33IO-------X/ ^ELEVATING MECHANISM 8 FRONT TRAIL FOR 75 MM PACK HOWITZER CARRIAGE Ml	l~yB'l'n	I +1 K I
PIN-A33O8	RA FSD 9g4
Figure 16.—Elevating mechanism and front trail, assembly (75-mm pack howitzer carriage, Ml).
TM 9—1320
26
7 5-MM HOWITZER MATERIEL
Reference A19112 113848 A3321 B13985 A19 A18423 CLDX3A B6833 Al 188 B5568 B103545 C5797 A3341 A8690 A3323 BBBX1A BBAX1B BBAX1C BBGX2C BFAX1EK BFFX1B BFCX1FG A15833 A3486 A3308 A3310 B6832 D2078 D2079 BCBX1AB BCBX1AD A18580 BCBX1ED A18498 A9 BCLX3ED BCKX2DG BCKX2DK BCFX2BE B5570 A3324 A3347 BECX3E BECX1G BECX1K BECX1M A15 A16
Item
Bolt, hex-hd., 8.. Ma-24NF-2 by Ma.
Case, gear, elevating, upper.
Connection, crank knob.
Cover, elevating gear case, lower.
Cover, elevating gear case, upper.
Eyebolt, trail connecting mechanism housing.
Fitting, lubr., push type, stght., J6-27NPT, male, short.
Fulcrum, trail.
Gasket, elevating lower gear case cover.
Hook, trunnion, L. H.
Hook trunnion, R. H.
Housing.
Latch, elevating crank knob.
Link, trail fulcrum.
Nut, crank spindle.
Nut, reg., hex., s-fln., H-28NF-2.
Nut, reg., hex., s-fln., Ma-18NC-2.
Nut, reg., hex., s-fln., H-16NC-2.
Nut, slotted, s-fin., M-10NC-2.
Pin, cotter, split, S., %2 by 1H.
Pin, rod end, J4 in. diam.
Pin, taper, No. 4 (.25) by 2.
Pin, trail fulcrum.
Pin, trunnion.
Pin, trunnion hook latch.
Pin, trunnion hook latch lever.
Plunger, trail fulcrum.
Rocker, left.
Rocker, right.
Screw, cap, hex-hd., J4-28NF-2 by 7/s.
Screw, cap, hex-hd., J4-28NF-2by 1J4.
Screw, cap, hex-hd., S., . ?	---WHEEL-AI5	1(6^\	TUBE-BI3506-
'	SHAFT- B13984—1
lCOVER-AI9 --GASKET-AII88	RA FSD 1355
।—WASHER-BECX3E	\O/
1-SCREW- BCFX2BE
Figure 17.—Elevating mechanism (75-mm pack howitzer carriage, Ml).
38
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
Reference	Item
CADX1AD A15836 C6584 A19312 A3321 B13985 A19 A3342 A1188 B103542 A20733 BGBX1 A3624 A3344 A3341 A3323 BBBX1A BFAX1DK A3343 BFDX1BP BFDX4BU BFDX1EZ B103533 A3311 BCBX1AB BCLX3ED BCFX2BE A3623 B13970 B13984 B5570 A3324 A3347 B13506 A15841 BECX3E BECX1G A15 A16	Bearing, ball, No. 7203. Bearing, elevating crank shaft. Case, gear, elevating, lower, Collar, elevating crank shaft. Connection, crank knob. Cover, elevating gear case, lower. Cover, elevating gear case, upper. Crank, elevating. Gasket, elevating lower gear case cover. Gear, bevel, elevating. Gland. Key, Me sq. by 1%. Key, elevating crank shaft. Knob, elevating crank. Latch, elevating crank knob. Nut, crank spindle. Nut, reg., hex., s-fln., J4-28NF-2. Pin, cotter, split, S., J4 by 1J4-Pin, crank spindle. Pin, stght., S., -%2 by Ji. Pin, stght., S., .118 by 194. Pin, stght., S., 3/ic by 1%. Pinion, elevating. Pinion, rocker. Screw, cap, hex-hd., J4-28NF-2 by Screw, mach., fi-hd., cor-res-S., No. 8 (0.164)-36NF-3 by J4. Screw, mach., oval-fil-hd., S., No. 10 (0.190)-24NC-2 by Jie. Screw, rocker pinion. Shaft. Shaft. Shaft, rocker pinion. Spindle, crank. Spring, compression, 0.063 diam. stock, .53 O. D., 10 coils. Tube, rocker pinion shaft. Washer, elevating worm ball bearing gland. Washer, lock, hv., No. 10 (0.190) by Jde by J4e. Washer, lock, reg., J4 by Mi 2 by Me. Wheel, elevating worm. Worm, elevating.
39
TM 9-1320
26
ORDNANCE DEPARTMENT
Id
COV E R-A179 41-
SCREW-BCFX2BD-V
WASHER-BECX3Ew \
//	V\	—SCREW-BCKX2AD
W	\\	---GUIDE-A9226
' f]	---NUT-C80I8
'X I yZCrFITTING
CLDX3A
SECTION A-A	^11^
SECTION THRU CROSS OVER PASSAGE
DA, ,	____ r-SCREW-BCKX2CG
SCREW-BCCXIAA	BALL-CCAXID	—SCREW-BCKXIDD
----WASHER	NUT-AI58I0----- Q Z-CLIP-A922P
I-------ARM-C6586	KEY-A20722	WASHER-AI58II-n M f	-CLIP AI5729
[-SCREW-A20723	rSLEEVE-C5784	SCREW-----fESCA. Q S	r<"v«‘j'”
/	\	'^X.
^Cbx
f '/ v^i	> Iraversinq guide	X.	'xX
c - xj/3^	x a 'X
( 'C^J^f-f '	X*..7
■ x v g x^. x	. . ■
® Traversing mechanism.
FIGURE 18.—Axle and traversing mechanism, assembly (75-mm pack howitzer carriage. Ml) —Continued.
42
TM 9-1320
26
7 5-MM HOWITZER MATERIEL
-------------PIN -A 21724
-----ST0P-A35I2	---------SCREW- BCNX2AA
---BUSHING-A3350	---------STEM-BI96I4
■.	------SPRING-A2I723
I \	BARREL-BI96I3----------
I /! /—of
•	v
TELESCOPE , ELBOW , M5-4
75-MM HOWITZER , Ml AI-^HHH
•-MOUNT , TELESCOPE ,MI6
RA FSD 1359
43L
iMlj 37 MM GUN,MJ9I_6_
OF MOUNT, TEL05C0PE,M3 ■p
r-	—~
°	i
	D
L 4
■■■■I
75MM PACK HOW
OfiDTfai-
--------8.175
Figure 21.—Testing targets.
45
TM 9-1320
ORDNANCE DEPARTMENT
Appendix
LIST OF REFERENCES
1.	Standard Nomenclature Lists.
Howitzer and carriage, pack, 75-mm, AH_____ SNL C-20
Howitzer and carriage, 75-mm, M2A1, M3, and SNL C-26 M3A1.
Material, cleaning and preserving, and tools and SNL K-l equipment used therewith.
Current Standard Nomenclature Lists are as OPS1 tabulated here. An up-to-date list of SNL’s is maintained as the “Ordnance
Publications for Supply Index.”
2.	Technical Manuals.
75-mm howitzer materiel____________________ TM 9-320
Cleaning and preserving materials__________TM 9-850
(Now published as TR 1395-A)
Ordnance maintenance procedure—materiel— TM 9-1100 inspection and repair.
Star gaging equipment and gutta-percha im- TAI 9-1860 pressions.
(Now published as supplement to SNL N-9)
Pressure gage outfits for cannon___________ TM 9-1870
(Now published as supplement to SNL N-9)
3.	Ordnance Field Service Bulletins.
Maintenance of materiel in hands of troops_OFSB 4-1
Electric and oxyacetylene welding__________OFSB 5-2
4.	Ordnance Proof Manual (proof of guns and carriages).
46
TM 9-1320
7 5-MM HOWITZER MATERIEL
5.	Drawings.	Class Division
75-mm pack howitzer, Ml, and M1A1------------ 52	206
75-mm howitzer carriage, M2A1, and M3--------	2	265
75-mm howitzer carriage, M3-------------------- 2	277
75-mm pack howitzer recoil mechanism, M1A2_	2	228
[A. G. 062.11 (11-6-40).]
By order of the Secretary of War :
G. C. MARSHALL, Chief of Staff.
Official :
E. S. ADAMS,
Major General,
The Adjutant General.
Distribution :
B 6 (2) ; IR 6 (2) ; Bn 9 (2) ; IC 9 (4).
(For explanation of symbols, see FM 21-6.)
47
U. S. GOVERNMENT PRINTING OFFICE; 1941
For sale by the Superintendent of Documents, Washington, D. C.
Price 10 cents
■Hi
HHHHHHHHH
I^TSU LIBRARY
■HMMi
l