Page 265 Continued

Section XII


a. A set of spare parts is supplied to the using arms for field replacement of those parts most likely to become broken, worn, or


Figure 209-Ammeter (for Electric Brakes) A162447
Figure 209-Ammeter (for Electric Brakes) A162447

otherwise unserviceable. The set should be kept complete at all times by requisitioning new parts for those used. Try each part as soon as practicable after received, to see that it fits the materiel properly. For listing of organizational spare parts for the 40-mm gun and carriage, see SNL A-50.

b. Care of spare parts is covered in section VII of this manual.


a. Accessories include the tools and equipment required for such disassembling and assembling as the using arms are authorized to perform, and for cleaning and preserving the gun and carriage. Accessories should not be used for purposes other than those prescribed, and when not in use should be properly stored.

b. There are a number of accessories, the names or general characteristics of which indicate their use. Others embodying special features or having special uses, are described in the following paragraphs.


a. Ammeter (for Electric Brakes). This ammeter (fig. 209) is used for measuring the current taken by the electric brakes of the carriage. It is used by connecting one terminal of the meter to one wire, and the other terminal of the meter to the point to which the wire is normally attached. When the current is supplied to the brakes, this meter registers the current flowing through the brakes.

b. Artillery Gun Book. This artillery gun book (0.0. Form 5825) is used for the purpose of keeping an accurate record of the materiel. It must always remain with the materiel regardless of where it may be sent. The book is divided as follows: record of assignment, battery commander's daily gun record, inspector's record of examination, as well as forms to be filled out in case of premature explosion. This book should be in possession of the organization at all times, and its completeness of records and its whereabouts are the responsibility of the battery commander. It must also contain date of issuance of


Figure 210-Automatic Loader Hood and Shield C95025
Figure 210-Automatic Loader Hood and Shield C95025

the materiel, by whom issued, and the place where issued. If a new gun is installed on the carriage, all data recorded in the old book with reference to sights, carriages, etc., must be copied into the new book before the old book is relinquished. Complete instructions on how to make entries in the artillery gun book are contained therein.

NOTE: Record of assignment data must be removed and destroyed prior to entering combat.

c. Automatic Loader Hood and Shield. This hood and shield (fig. 210) consists of a large steel hood assembly to which is fastened by a leather strap, a steel shield assembly. It fits over the feed guides and the opening in the rear breech casing cover when the gun is not in use, protecting the automatic loader against dirt and weather.

d. Barrel Carrier (C95032). This carrier (fig. 212) consists of two tubular steel handles which are inserted into a cradle. The handles are held in position in the cradle by straight pins that go completely through cradle and handles. The carrier is used to support the rear of the barrel assembly when removing it from and installing it in the breech ring.

e. Bore Brush M29 (B240944). This bore brush (fig. 212) consists of a spiral bristle brush with a nut on one end. Its use is to oil the bore of the gun.

f. Buffer Cylinder Spanner Wrench (A228073). This wrench


Figure 211-Cartridge Remover B200491
Figure 211-Cartridge Remover B200491

(fig. 212) is constructed of steel having an over-all length of 6.75 inches. Its use is disassembly and reassembly of buffer cylinder on the under side of the loading tray.

g. Cartridge Remover. This remover (fig. 211) is used to remove cartridges from the automatic loader. The remover is U-shaped in appearance. When in use, it is pressed over the cartridges and forces the feed and stop pawls of the automatic feed loader device clear, allowing removal of the cartridges. The remover and cartridges are removed together, out of the top of the loader, the pawls being depressed clear.

h. Cleaning Staff M14 (C97385). The cleaning staff, 144 inches long (fig. 212), consists of three wooden sections. It is used with the bore brush for cleaning bore of gun. The bore brush is removed and the shell ejector substituted when removing stuck shells from gun chamber.

i. Closing Spring Cover Wrench. This wrench (fig. 213) consists of a body, handle, rivet, and spline. These parts when assembled constitute a T-shaped wrench used to remove the cover from the breech ring closing spring assembly.

j. Electric Brake Control Set M2 (C121778). This set is supplied with the gun carriage and utilized when the gun carriage is


Figure 212-Accessories for 40-mm Gun and Carriage
Figure 212-Accessories for 40-mm Gun and Carriage

Figure 213-Closing Spring Cover Wrench A228074
Figure 213-Closing Spring Cover Wrench A228074


Figure 214-Equilibrator Rod Nut Wrench B198554
Figure 214-Equilibrator Rod Nut Wrench B198554

towed by a 2 1/2-ton truck (prime mover). This set is operated by the driver of the truck.

k. Equilibrator Rod Bushing Nut Wrench. This single-end wrench (fig. 214) which has a handle with two right-angle bends, is used to adjust the compression of the equilibrator springs, also to remove and replace the equilibrator rod jam nut and bushing nut.

l. Equilibrator Spring Compressor and Guard. The equilibrator spring compressor (fig. 215) is composed of a threaded shaft, pin clip assembly, guard, and a wrench to which is assembled a bearing, a screw, and two collars. One end of the shaft is threaded and is smaller then the body of the shaft so that it may be screwed into the end of the equilibrator rod assembly with a wrench used on the opposite (shoulder) end of shaft. The shaft is locked in place with the pin clip assembly. The equilibrator spring is compressed by screwing up the wrench on the shaft. The guard, which is inserted through holes in the equilibrator case, is used to hold the compression of the spring after the equilibrator case cover has been opened and the two equilibrator rod assembly nuts have been removed prior to the insertion of the spring compressor. Compression of the spring may be relieved by unscrewing the wrench on the shaft.

m. Extractor Spindle and Safety Plunger Key Puller. This puller (fig. 216) is constructed from 3/8-inch bar steel. It has an over-all


Figure 215-Equilibrator Spring Compressor C95677
Figure 215-Equilibrator Spring Compressor C95677

length of 7 1/2-inches. It is used to lift the breech ring safety plunger during the removal of the breechblock and cranks. It is also used for insertion and removal of the extractor spindle from the breech ring.

n. Flash Guard Wrench. This wrench (fig. 217) consists of two tubular handles, two jaws, a pin, and catch assembly. To use, release the catch by pressing downward. This allows the jaws to rotate on the pin. When open, place on the rear hexagonal portion of the flash hider, close jaws, which automatically fasten the catch. The wrench is then in position for removal of the barrel or flash hider.

o. Front and Rear Loader Lifters. These two lifters (fig. 218) are of all metal welded construction. The larger of these two lifters is hooked to the rear portion of the automatic loader, the other to the fore part. When in this position, two men can remove the automatic loader assembly from the gun.


Figure 216-Extractor Spindle and Safety Plunger
Key Puller A228093
Figure 216-Extractor Spindle and Safety Plunger Key Puller A228093

Figure 217-Flash Guard Wrench C95038
Figure 217-Flash Guard Wrench C95038


Figure 218-Front B200472 and Rear B200471 Loader Lifters
Figure 218-Front B200472 and Rear B200471 Loader Lifters

Figure 219-Hand Cartridge Extractor A228060
Figure 219-Hand Cartridge Extractor A228060


Figure 220-Shell Ejector A298763
Figure 220-Shell Ejector A298763

p. Hand Cartridge Extractor. This extractor (fig. 219) is of all metal construction having an over-all length of 13.43 inches. The end of the tool bent at approximately a 20-degree angle is used to extract cartridges from the barrel should cartridges fail to be ejected by the extractors. Raise the top cover of the breech casing to accomplish afore-mentioned extraction. The end formed at right angles to the major part is used to remove the outer breech ring crank assembly.

q. Hub Cap Wrench. This wrench (fig. 222) has an octagonal shaped opening at one end and a 30-degree offset handle at the other end. It is used for removing the hub caps from the wheel hubs.

r. Loader Feed Rod Spring Compressor. This compressor (fig. 222) consists of a jaw and screw. Its use is to compress the feed rod spring during the assembly and disassembly of the feed rod holders and feed rods to replace a broken or weak loader feed rod spring.

s. Locking Pin Seat Wrench. This wrench (fig. 222) T-shaped in appearance, is composed of a body and handle. It is used to unscrew spring seat allowing removal of breech ring safety plunger.

t. Shell Ejector. This ejector (fig. 220) is used to remove live shells stuck in the chamber of the gun tube with the rotating band wedged in the origin of rifling. The ejector is bored at one end and shaped to suit the shoulder of the shell and clear the fuze; the other


Figure 221 - Shell Pusher C95031
Figure 221 - Shell Pusher C95031

Figure 222-Accessories for 40-mm Gun and Carriage
Figure 222-Accessories for 40-mm Gun and Carriage


Figure 223-Striker Protrusion Gage A276650
Figure 223-Striker Protrusion Gage A276650

end has a screw-threaded projection to fit the socket of the cleaning staff. The ejector is screwed on the cleaning staff and inserted into the muzzle of the gun tube. The shell is then pushed out of the gun tube chamber by gradually forcing the cleaning staff-shell ejector assembly to the rear. The hand operating lever should be held fully to the rear in order to depress the breechblock fully. The person removing the stuck shell should stand as much as possible to the side of the muzzle as a safety precaution.

u. Shell Pusher. This pusher assembly (fig. 221) consists of a handle, brace, and pusher. The brace is securely welded to the handle approximately 3.5 inches from the pusher, which is fastened by a pin to the working end of the handle. This pusher assembly is used to unload cartridges remaining in the automatic loader at the conclusion of firing. There are two methods by which this may be accomplished:

(1) Force the cartridges between the feed rollers on to the loading tray (with the rammer cocked and the hand operating lever in the rear position) by means of the pusher, using the feed pawls as a fulcrum. The hand operating lever must be rotated to the rear each time a cartridge is forced between the feed rollers; this is necessary to release the feed catches.

(2) Insert the prepared flat end of the pusher into the rear of the

automatic loader between the feed rollers, and force the cartridges upward into the cartridge remover (fig. 211). Care must be taken not to use undue pressure when forcing the rounds upward.

v. Side Cover Key. This key (fig. 222) is of all metal construction having a bar handle. Its use is to lock and unlock the side cover. To use, insert into opening provided in side cover, exerting just enough pressure against spring tension to allow turning, thereby releasing catch.

w. Striker Bushing Wrench. This wrench (fig. 222) consists of a body and handle and is used to remove the loading tray bolt spring seat, breechblock firing pin spring cover, and loading tray attaching bolt.

x. Striker Protrusion Gage. This gage (fig. 223) is used to determine if the length of protrusion of the striker or firing pin is within the specified limits (0.114 in. max., 0.099 in. min.). When placing the gage over the firing pin against the face of the breechblock, it can be determined in two steps whether the length of protrusion is less than the minimum allowable 0.099 inch or more than the maximum allowable 0.114 inch. Firing pins that do not fall within these limits should be replaced.

Section XIII


a. General. The 40-mm Automatic Gun M1 and Carriages M2 and M2A1 (AA) can be shipped and stored either with or without the gun mounted. All precautions should be taken to prevent corrosion during shipment and storage, to keep the recoil mechanism exercised, and to prevent the deterioration of rubber during storage. The materiel should be prepared for both shipment and storage as directed in subparagraph h, below.

b. Preparation of 40-mm Automatic Gun M1 and Carriages M2 and M2A1 (AA).

(1) LUBRICATION. The materiel should be completely lubricated before shipment or storage in accordance with lubrication instructions as directed in section VI.


(a) The materiel shall be thoroughly cleaned and made free of all foreign matter, using SOLVENT, dry-cleaning, or a soap solution.

(b) Special attention should be given to breech and firing mechanism, and where possible, a partial disassembly of these components should be made to insure thorough cleaning.

(c) Apply SOLVENT, dry-cleaning, by scrubbing with a clean brush or wiping with clean saturated cloths.

(d) Apply soap solution by vigorously brushing or scrubbing the surfaces thoroughly until all traces of contamination have been removed. Rinse the cleaned surfaces with clean, hot water and dry thoroughly.

(e) Avoid contact of bare hands with the cleaned surfaces.

(3) PAINTING. Painted surfaces that have become checked, pitted, or rusted must have the rust spots removed and the surfaces repainted.

(a) Removing Rust Spots. The following may be used in removing rust spots:

1. CLOTH, abrasive, aluminum-oxide, for cleaning finished and unfinished external surfaces where wear of the parts cleaned will not affect the functioning of the mechanism.

2. CLOTH, crocus, for removing rust or stain and polishing parts of the breechblock and firing mechanism and other finished surfaces of metal.

(b) Application of PRIMER, Synthetic, Rust-inhibiting (AXS750). Apply a liberal coating of PRIMER, synthetic, rust-inhibiting over entire area of the cleaned surfaces to be repainted as follows:

1. Brushing or spraying. PRIMER, synthetic, rust-inhibiting, should be used on bare metal as a base coat for synthetic enamel. It may be applied either by brushing or spraying. The primer will brush satisfactorily as received or after the addition of not more than 5 percent by volume of THINNER, paint, volatile mineral spirits, TT-T-291. For spraying, the primer may be thinned with not more than 15 percent by volume of THINNER, paint, volatile mineral spirits, TT-T-291. Allow to dry thoroughly.

(c) Sandpapering Surfaces. Sandpaper the primed surfaces with PAPER, flint, class B, No. 00, and wipe all particles of dust from surfaces.

(d) Application of Enamel. Apply coat of ENAMEL, synthetic, olive-drab, lusterless, and allow to dry thoroughly before the materiel is used.

(4) APPLICATION OF PRESERVATIVE. NOTE: Application of preservatives should be accomplished immediately after cleaning and drying. Rust-preventive compounds, light and heavy, used herein shall be brought to the proper consistency by heating before application.

(a) Apply a coating of COMPOUND, rust-preventive, light, to interior portions of breech mechanism. Apply a coating of COMPOUND, rust-preventive, heavy, to all exterior portions of the breech.

(b) Thoroughly swab the bore of the gun with COMPOUND, rust-preventive, light.

(c) External Unpainted Surfaces.

1. Use COMPOUND, rust-preventive, thin film, on external unpainted surfaces of the carriage that are not highly finished, critical, or operating, and from which preservative need not be completely removed before materiel is placed in operation. This compound will be applied by brushing or spraying without heating or solvent dilution.

2. Use COMPOUND, rust-preventive, heavy, on external unpainted, critical operating surfaces of the carriage from which preservative must be completely removed before materiel is placed in operation.

(5) COVERS. Install breech and muzzle covers supplied with the materiel, and fasten securely. Using TAPE, adhesive, nonhygroscopic, wrap that portion of tube adjacent to the end of muzzle cover and over the end of cover, sealing the muzzle end of the gun. If covers are not available, the muzzle and breech ends of the gun shall be sealed using two layers of PAPER, greaseproof, wrapping, and one of PAPER, Kraft, wrapping, waterproofed. Apply TAPE, adhesive, nonhygroscopic, over paper completely sealing the openings.

(6) MISCELLANEOUS. Free end of electric brake jumper cable and coupling shall be taped and tied securely to the drawbar.

(7) GENERAL INSPECTION. Make a systematic inspection just before shipment or storage, and list all broken or missing items that are not repaired or replaced, and attach this list to the materiel.


a. General. All loading and blocking instructions as specified herein are minimum, and are in accordance with the Association of American Railroads, "Rules Governing the Loading of Commodities on Open Top Cars, Special Supplement, Revised 1 March 1943," containing the "Rules Governing the Loading of Mechanized and Motorized Equipment and Major Calibre Guns."

b. Instructions.

(1) INSPECTION. Railroad cars must be inspected to see that they are suitable to carry loads to destinations. Floors must be sound and all loose nails or other projections not an integral part of the car should be removed.

(2) RAMPS. Permanent ramps should be used for loading the materiel when available, but when such ramps are not available, improvised ramps may be constructed of rail ties and other available lumber.


(a) Cars loaded in accordance with specifications given herein must not be handled in hump switching.

(b) Cars must not be cut off while in motion, and must be coupled carefully and all unnecessary shocks avoided.

(c) Cars must be placed in yards or sidings so that they will be subjected to as little handling as possible. Separate track or tracks,

when available, must be designated at terminals, classification or receiving yards, for such cars, and cars must be coupled at all times during such holding and hand brakes set.

(4) PLACARDING. Materiel not moving in combat service must be placarded, "DO NOT HUMP."

(5) CLEARING LIMITS. The height and width of load must be within the clearance limits of the railroads over which it is to be moved. Army and railroad officials must check all clearances prior to each move.

(6) MAXIMUM LOAD WEIGHTS. In determining the maximum weight of load, the following shall govern, except where load weight limit has been reduced by the car owner:

Marked Capacity
of Car
Total Weight
of Car Load
Load Weight
(It. wt. of car
to be deducted)
40,000 66,000 66,000
60,000 103,000 103,000
80,000 136,000 136,000
100,000 169,000 169,000
140,000 210,000 210,000
200,000 251,000 251,000


Capacity of car 100,000 lb
Total weight of car and load 169,000 lb
* Light weight of car (to be subtracted) 37,000 lb
Permissible weight of load 132,000 lb

NOTE: When loading railroad cars, materiel shall be so loaded as to require a minimum number of cars. To accomplish this, various types of materiel may be loaded on the same car provided all have the same destination.

(7) BRAKE WHEEL CLEARANCE (A, fig. 224). Each railroad car must be loaded with a resulting brake wheel clearance of at least 6 inches in front, at each side and at the top. Brake wheel clearance shall be increased as much as is consistent with proper location of load.

(8) BRAKES. After loading and bracing the materiel, set the hand brakes.

(9) TIRES. Tire pressure shall be increased to 55 pounds per square inch.

(10) TYPE OF CARS. Flat, box, or drop end gondola cars may be used.

(11) DRAWBAR REMOVAL. Drawbar should be removed and secured to floor of railroad car by strapping with No. 8 gage, black annealed wire or flat steel strapping. Attach wire to floor by wrapping around blocks and nailing the blocks to the floor. Secure flat steel

* This marking is stenciled on each side of car indicated as "LT.WT."
Load must be so placed on the car that there will not be more weight on one side of the car than on the other. One truck of the carrying car must not carry more than one-half of the load weight.

Figure 224 - Method of Blocking 40-mm Automatic Gun M1 and Carriage M2 and M2A1 (AA) on Railroad Car
Figure 224 - Method of Blocking 40-mm Automatic Gun M1 and Carriage M2 and M2A1 (AA) on Railroad Car

strapping that is not punched for nailing to floor by means of anchor plates attached to the car floor.

(12) GUN POSITION. Place gun in its traveling position with the gun stay in place.

(13) OUTRIGGER COVERS. Outriggers should be positioned for traveling with the covers in place over the hinge joints for protection from dirt and weather.

c. Blocking. All item reference letters given below refer to the details and locations in figure 224.

(1) PATTERN 3, ITEM B (EIGHT PIECES OF PATTERN 3 REQUIRED). Place one pattern 3 at the front and one at the rear of each wheel. The 45-degree portion of the block shall be placed next to the tire. Nail the heel of the pattern to the car floor with three 40-penny nails and toenail that portion under tire to car floor with two 40-penny nails before patterns 2 are applied.

(2) PATTERN 2, ITEM C (EIGHT PIECES OF PATTERN 2 REQUIRED). Place two patterns 2 on each side of the carriage against the outside of each tire. Nail the bottom pattern to the car floor with three 40-penny nails and the top pattern to the pattern below with three 40-penny nails.

(3) PATTERN 7, ITEM D (FOUR PIECES OF PATTERN 7 REQUIRED). Place one pattern 7 under the axle near the inside face of each wheel. These patterns should be cut so as to fit snugly between the car floor and the axle to relieve partially the weight from the tires. Nail each pattern to the car floor with six 40-penny nails.

(4) STRAPPING, ITEM S. Secure each wheel by passing wire consisting of four strands, two wrappings of No. 8 gage, black annealed wire through two openings in the wheels and securing the wire to the stake pockets on each side of the car. Twist tie with rod or bolt enough to remove slack. The openings in the wheels through which the wire passes should be approximately the same distance from the car floor. NOTE: When drop end gondola car is used, apply strapping in similar fashion, and attach to the floor by use of blocking or anchor plates.


a. When the materiel is stored uncrated, preparation will be in accordance with paragraph 118 h.

b. Periodical Inspections. Periodical inspections shall be made while the materiel is stored, to note among other things, general condition, missing parts, and the need for repairs. If found to be corroding at any part, the entire procedure as given herein under paragraph 118 b will be repeated.

c. Inspect the tires, repair any leaks that have developed, and inflate, if necessary.


Section XIV


a. Because of the different climates in which this materiel may be expected to operate, special instructions are given in this section for three regions, namely: Arctic, temperate, and tropical.

b. In certain cases, the prescribed instructions may not apply; for example, a tropical climate may be experienced in a temperate region. In cases of this nature, the instructions as to the classification of the climate in which the materiel is operating is left to the judgement of the ordnance officer. He is cautioned, however, that only extended, and not temporary, periods of climatic conditions govern the classification.

c. Manufacturing arsenals and plants should lubricate the materiel on assembly as prescribed in the lubrication guides (figs. 104 and 105). If the materiel is to be used in a climate other than temperate, the precautions in paragraphs 119 and 120 should be taken.

d. Materiel, previously lubricated for a colder climate than the one in which the materiel is to be used, should be relubricated with lubricants prescribed for use in that climate.

e. Materiel, previously lubricated for a warmer climate than the one in which the materiel is to be used, should be completely cleaned of all lubricants and relubricated with the lubricants prescribed for use in that climate.


a. The bore of the gun should be cleaned and oiled more frequently than usual when operating in hot climates. Temperature changes will cause condensation of moisture in the air on metal, and cause rusting. If condensation occurs on other metal parts of the gun and carriage, wipe them dry and coat with oil as required to prevent rusting.

b. Materiel should be inspected frequently when being operated in hot, moist areas. Cloth covers and other items which may deteriorate from mildew, or be attacked by insects or vermin should be aired and dried often.

c. Lubrication. Lubricate the materiel and check the levels of lubricants in gear cases more frequently when operating in hot climates. Heat will cause lubricants to thin out and deteriorate more quickly; gear cases and other lubricant-retaining devices may leak when the lubricant is hot. Use the lubricants prescribed for temperatures over 32 F as instructed in section VI.

d. Tires. Tires should be checked at frequent intervals to ascertain that the pressure is not above that which is prescribed, 45 pounds per square inch. Tires must be kept out of the direct rays of the sun

as much as possible. They should be covered to protect them from prolonged exposure to the sun.

e. Ammunition. Ammunition should be kept cool, and always out of the direct rays of the sun. Moisture-resistant seals should not be broken until ammunition is to be used.

NOTE: Extreme heat is often accompanied by other adverse conditions. Refer to paragraphs 121 and 122.


a. When the weapon is operated at sub-zero temperatures, special precautions must be taken in its care and maintenance to avoid poor performance and/or total functional failure, and in some instances, damage to both materiel and personnel. The materiel can be operated efficiently if the instructions given here are followed, even when average temperatures below zero degree F prevail. These instructions also should be followed when sluggish or stiff operation of the materiel indicates the advisability of adopting them at higher temperatures.

b. Introduction to Low Temperature Lubrication.

(1) Lubricating oils stiffen progressively as temperature drops until a point is reached at which they solidify. As stiffness increases, the power required to move bearing surfaces and gears in contact with the oil multiplies rapidly until movement becomes impossible. When solidification occurs, the moving parts cut a channel through the solid oil leaving the rubbing surfaces dry and unlubricated. Before friction can develop enough heat to liquefy the oil and reestablish an oil film, bearing and gear tooth surfaces may score and fail completely.

(2) Similar action takes place where rubbing surfaces are fed by an oil pump. The stiffened oil flows too slowly, or not at all, to the pump inlet and the oil already in the feed lines cannot be forced to the bearings. Oils, prescribed for use in artillery materiel at high temperatures, are designed to maintain adequate body at those temperatures. In most instances, they become too stiff at low temperatures for satisfactory operation. They must therefore be completely replaced in cold weather with lighter oils which will remain fluid at the lowest expected operating temperatures.

(3) Grease is a combination of soap and oil. The soap acts as a sponge to hold the oil in place, thus preventing leakage which might occur if oil alone were used. As temperature decreases, both oil and soap stiffen and retard the movement of parts. In cold weather, therefore, greases which cause minimum drag must be used.

(4) The presence of only a small quantity of warm weather grease may immobilize bearings and prevent the manipulation of the gun at sub-zero temperatures. When sub-zero temperatures are expected, all grease used in temperatures above zero degrees F must be removed

from bearings and gear cases and replaced with the specified low temperature products. Once grease has solidified, it cannot be removed from bearings or gear cases without the application of enough heat to melt it, or the disassembly of the unit and the washing of the parts with SOLVENT, dry-cleaning.

c. Mechanical Condition. Since metals contract and expand with temperature change and the amount of expansion and contraction varies with different metals, the clearance between bearing surf aces consisting of dissimilar metals is considerably less at sub-zero than at higher temperatures. In preparing artillery for sub-zero operation, therefore, care should be taken that parts are aligned properly and normal clearances exist. This applies not only to bearings but also to mechanisms employing packings around rotating or reciprocating shafts or rods. Lack of attention to this may result in binding which will make mechanisms stiff or inoperative, regardless of the lubricant used. Scored or rough bearing surfaces also interfere with easy action and should be smoothed in preparing materiel for low temperature operation.

d. Cleanliness. Cleanliness is imperative. Rust, dirt, and gummy oil and grease in bearing clearances reduced by low temperature will interfere with the proper feed of lubricant. This will cause stiff action, if not complete stoppage. In winterizing materiel, therefore, assemblies and mechanisms must be disassembled sufficiently to permit thorough removal of old oil, grease, and foreign matter. Cleaning is most efficiently done by washing with SOLVENT, dry-cleaning, employing brushes and scrapers where necessary. Field experience has proved that neglect in cleaning small linkages, bearings, and other similar parts may cause malfunctioning and stoppages in sub-zero weather.

e. Timeliness. Placing of materiel in proper mechanical condition requires time for necessary disassembly, repair, and cleaning, and must be carefully done. The approach of low temperature must be anticipated far enough in advance to permit completion of the conditioning before the onset of sub-zero temperatures.

f. Prescribed Lubricants. The following materials will be used for the lubrication and preservation of the gun and carriage at temperatures below zero degree F, and above zero degree F where stiff action indicates their necessity. Refer to SNL K-1 for specification designations of products available through the ordnance provision system.

(1) OIL, LUBRICATING, PRESERVATIVE, LIGHT. All bearings, gear cases, and mechanisms for which the prescribed oil at normal temperatures is engine oil. Miscellaneous hand oiling.

(2) OIL, LUBRICATING, FOR AIRCRAFT INSTRUMENTS AND MACHINE GUNS. Oil-lubricated parts in directors, sighting instruments, and other fire control equipment.

(3) OIL, HYDRAULIC. All hydraulic systems for speed gears and remote control oil gears.

(4) GREASE, O.D., No. 00. All bearings, gears, and mechanisms for which GREASE, O.D., No. 0, is prescribed at temperatures above 32 F.

(5) GREASE, LUBRICATING, SPECIAL. Grease-lubricated mechanisms of fire control materiel.

(6) GREASE, GENERAL PURPOSE, No. 2. Wheel bearings at all temperatures.

(7) CLEANER, RIFLE BORE. May be used for cleaning gun bores after firing if a cleaning solution is not available.

(8) SOLUTIONS, SPONGING. Cleaning gun bores after firing.

(9) SOLVENT, DRY-CLEANING. Cleaning grease and oil from all mechanisms and parts. May also be used for diluting OIL, engine, SAE 10, in engine crankcases.

g. Low Temperature Lubricating Instructions. To insure adequate lubrication and satisfactory performance of artillery materiel in cold weather, the following instructions must be followed when sub-zero temperatures are expected:

(1) BALL AND ROLLER BEARINGS, GREASE LUBRICATED. It is impossible to replace warm weather grease in ball and roller bearings by forcing in the grease prescribed for low temperatures. Attempts to do this result in overloading the bearings with unsuitable lubricant which will congeal at low temperatures and immobilize the moving parts. These bearings must be removed by disassembly from the materiel, washed thoroughly in SOLVENT, dry-cleaning, to remove all traces of heavy grease, dried, and then repacked with the prescribed lubricant in accordance with instructions in War Department Lubrication Guide, No. 61.

(2) BALL AND ROLLER BEARINGS, OIL-LUBRICATED. Oil-lubricated ball and roller bearings preferably should be removed and cleaned. If this is impractical, a thorough flushing with SOLVENT, dry-cleaning, followed by application of the prescribed oil generally will give satisfactory results. Oil sumps and reservoirs must be drained, flushed, and filled with the proper oil. The wicks of wick-fed bearings should be removed and saturated with OIL, lubricating, preservative, light, before reassembling.

(3) PLAIN JOURNAL BEARINGS AND BUSHINGS. It is preferable to disassemble these bearings, not only to remove thoroughly all heavy oil and grease, but also to smooth all roughness and to test for adequate clearance between shaft and bearing. Where disassembly is impracticable, heavy lubricant usually can be forced from the bearings by thorough flushing with OIL, lubricating, preservative, light. Reservoirs and wick feeds must be cleaned completely and

refilled to the prescribed level with the proper oil.

(4) GEARS, OIL-LUBRICATED. Where gears are inclosed in oiltight gear cases filled with oil, all oil will be drained, the case flushed with SOLVENT, dry-cleaning, and the case refilled to the proper level with OIL, lubricating, preservative, light. Where no drain or level plug is provided, the gear cases will be disassembled by ordnance maintenance personnel.

CAUTION: Do not fill above the prescribed level as the surplus oil will cause unnecessary drag on the movement of the gears.

(5) GEARS, GREASE-LUBRICATED. Since it is practically impossible to wash heavy grease out of a gear case by flushing, grease-filled cases will be disassembled, cleaned, and refilled by ordnance maintenance personnel.

h. Elevating Arc. It is often found that snow will collect on the elevating arc. This snow will cake under the pressure of the gears, forming ice and interfering with the elevation of the piece. This snow must be removed by vigorous brushing with a stiff bristle or wire brush before elevation of the piece is attempted.

i. Gun Bore.

(1) Cleaning of a gun bore after firing cannot be accomplished in the normal manner at temperatures below 32 F because the water will freeze in the tube. If the cleaning can be done with the tube hot, and hot water is available, normal SODA ASH or soap solutions can be used. Otherwise, it will be necessary to add alcohol, glycerine, or COMPOUND, antifreeze, to the normal SODA ASH or soap solution to prevent freezing.

(2) To ten parts by volume of cleaning solution, add the number of Darts of one of the antifreezes shown below:

Temperature F Glycerine or Alcohol or Ethylene Glycol
20 2 1/2 2 2
10 5 4 3 1/2
0 6 1/2 6 1/2 5
-15 10 9 7 1/2
-30 13 16 10
-40 16 27 12

(3) When available, CLEANER, rifle bore, may be used. However, this solution will freeze at temperatures below 32 F. If frozen, it must be thawed and shaken well before using. Closed containers should not be filled to more than 75 percent of capacity in freezing weather. Completely filled containers will burst when contents freeze. In an emergency, SOLVENT, dry-cleaning, or OIL,

lubricating, preservative, light, may be used, but neither is as effective as the cleaning solution.

(4) In applying OIL, lubricating, preservative, light, to the bore after cleaning, care must be taken to work the oil in well so that it will reach all surfaces of the lands and grooves. When the gun is brought into a heated shop, condensation will occur on all metal surfaces. After the gun reaches shop temperature, the tube and all other bright metal parts must be wiped dry and recoated with oil to prevent rusting.

j. Firing Pin and Attendant Parts, Breechblock and Breech Casing Firing Mechanism Parts. Not only must extreme cleanliness be maintained, but oil must be applied sparingly to obtain proper functioning in cold weather. The best method of application, after cleaning thoroughly with SOLVENT, dry-cleaning, is to wipe the rubbing surfaces of the parts with a clean cloth which has been wet with oil and wrung out. Use OIL, lubricating, preservative, light, for normal winter temperatures. In extreme cold, use OIL, lubricating, for aircraft instruments and machine guns.

k. Recoil Cylinder. The recoil cylinder is filled with a mixture of 60 parts by volume of OIL, hydraulic, and 40 parts by volume of OIL, recoil, light. This mixture will be used in all temperatures.

l. Oil Gears. Although hydraulic oil is considered satisfactory for sub-zero temperatures, it may be expected to stiffen to some extent at low temperatures. Oil gears should be exercised for periods of at least 30 minutes, often enough to assure that the materiel functions properly and is ready for action at all times. This exercising will warm the oil and gears.

m. Sighting and Fire Control Equipment. Sighting and fire control equipment is normally lubricated for operation over a wide range of temperatures. This equipment should be exercised frequently during periods of low temperature to insure proper functioning. If any equipment does not function properly, the ordnance maintenance personnel should be notified.

n. Emplacement. Gun carriages and supports for fire control equipment freeze quite solidly into the ground in cold weather. As a result, considerable labor is required to dig the equipment if the battery position must be changed. To prevent this, coat all surfaces that contact the ground with waste grease or very heavy oil before emplacing. Sources of waste lubricant are the gear casings of guns and automotive equipment, the drainings and scrapings of these being used. They are obtained when the materiel is relubricated for cold weather.

o. Electric Brakes. Before traveling, the safety switch should always be checked for proper operation because low temperatures

seriously reduce the efficiency of the "hot-shot" batteries. Partly discharged batteries must be replaced with new and fully charged units. The plugs must be kept clear of ice and snow or it will be impossible to insert them in their sockets.

p. Tires. Tires should be checked at frequent intervals to insure that the pressure is not below that prescribed, 45 pounds per square inch.

q. Dry Cell Batteries. Dry cell batteries are very unsatisfactory after exposure for a few hours to low temperatures.

r. Inspection. Inspections should be made daily because of the limited amount of lubricant used in cold weather operations.

s. Operation. Keep the loading platform free of ice or snow to prevent injury to personnel caused by insecure footing. The bore should be inspected frequently for frosting or congealed lubricants. The flash hider cover and the automatic loader hood and shield should be in place as much of the time as the rate of fire permits to exclude snow and moisture from the interior of the weapon.


a. When the materiel is active, clean and relubricate the bore and exposed metal surfaces more frequently than is prescribed for normal service. Moist and salty atmospheres have a tendency to emulsify oils and greases and destroy their rust-preventive qualities. Inspect parts frequently for corrosion. Keep the flash hider cover and the automatic loader hood and shield in place as much of the time as firing conditions permit.

b. Cloth covers and other items that may deteriorate from dampness should be inspected frequently and dried as often as possible.

c. When the materiel is inactive, the unpainted parts should be covered with a film of COMPOUND, rust-preventive, heavy, and should be inspected daily for traces of the formation of rust. All covers should be in place.


a. When the weapon is active in dusty or sandy areas, remove lubricants from the elevating rack and from exposed sliding parts and bearing surfaces. Surface lubricant will pick up sand and dust, forming an abrasive which will cause rapid wear. Lubricate the parts after action.

b. Inspect and lubricate the materiel more frequently when operating in sandy or dusty areas. Exercise particular care to keep sand and dust out of the mechanisms and oil receptacles when carrying out inspecting and lubricating operations and when making

adjustments and repairs. Cover the cooling slots in the forward portion of the breech casings of those guns having these slots. Seal all openings in the rear portion of the breech casing. Keep all covers in place as much of the time as firing conditions permit. Shield parts from flying sand and dust with tarpaulins or the carriage cover during disassembly and assembly operations.

c. Should the prescribed lubricant for the gun bore prove inadequate in preventing rusting of the bore surfaces, OIL, lubricating, preservative, medium, may be used for oiling of the bore during periods of inactivity.


Section XV


The following publications indexes should be consulted frequently for latest changes or revisions of references given in this section and for new publications relating to materiel covered in this manual:

a. Introduction to Ordnance Catalog (explaining ASF Cat. SNL system) ORD 1 IOC
b. Ordnance Publications for Supply Index (index to SNL's) ASF Cat. ORD 2 OPSI
c. Index to Ordnance Publications (listing FM's, TM's, TC's, and TB's of interest to ordnance personnel, OPSR, MWO's, BSD, S of R's, OSSC's, and OFSB's; and includes Alphabetical List of Major Items with Publications Pertaining Thereto) OFSB 1-1
d. List of Publications for Training (listing MR's, MTP's, T BA's, T/A's, FM's, TM's, and TR's concerning training) FM 21-6
e. List of Training Films, Film Strips, and Film Bulletins (listing TF's, FS's, and FB's by serial number and subject) FM 21-7
f. Military Training Aids (listing Graphic Training Aids, Models, Devices, and Displays) FM 21-8


a. Ammunition.  
Ammunition, fixed and semifixed, all types, including subcaliber for pack, light and medium field artillery, including complete round data SNL R-1
Ammunition for antiaircraft artillery SNL P-5
Ammunition instruction material for antiaircraft, harbor defense, heavy field, and railway artillery, including complete round data SNL P-8
b. Care and Maintenance.
Cleaning, preserving and lubricating materials; recoil fluids, special oils, and miscellaneous related items SNL K-1
Soldering, brazing and welding material, gases and related items SNL K-2

c. Materiel.  
Director, A.A., M5A2 and M6 (British) SNL F-209
Gun, automatic, 40-mm, M1 and carriage, gun 40-mm, M2 (A.A.) SNL A-50
Indicator, range, Mk. I, Navy SNL F-287
Quadrant, gunner's, M1 SNL F-140
Sight, computing, M7 SNL F-276
Sight, correctional, Mk. V SNL F-286
Small arms, automatic gun, trench mortar and field artillery sighting equipment and fire control instruments SNL F-1
System, remote control, M10 SNL F-208
Telescope, elbow, M17 (for directors M4, M5, M5A1, M6, M7, and M7A1 SNL F-231
Unit, generating, M5 and M6 SNL F-227


a. Ammunition.  
Ammunition, general TM 9-1900
Artillery ammunition OS 9-20
Range regulations for firing ammunition for training and target practice AR 750-10
b. Care and Preservation.
Artillery lubrication, general OFSB 6-4
Chemical decontamination materials and equipment TM 3-220
Cleaning, preserving, lubricating, and welding materials and similar items issued by the Ordnance Department TM 9-850
Cold weather lubrication and service of artillery materiel OFSB 6-5
Defense against chemical attack FM 21-40
Maintenance and care of pneumatic tires and rubber treads TM 31-200
Military chemistry and chemical agents TM 3-215
c. Fire Control Materiel.
Auxiliary fire control instruments TM 9-575
Directors M5A1, M5, and M6 TM 9-659
Fire control and position finding FM 4-15
Generating units M5 and M6 TM 9-616
Service of the piece, 40-mm fire unit FM 4-160
d. Firing tables FT 40-AA-A-2

e. Inspection and Maintenance.  
AA cable system and repair kits, all types, and voltage controller M1 TM 9-649
Instruction guide: Instrument repairman TM 9-2602
Ordnance maintenance: Directors M5 and M6 TM 9-1659
Ordnance maintenance: Generating unit M5 TM 9-1616 Ordnance maintenance: Gun and top carriage of 40-mm antiaircraft gun materiel M2 TM 9-1252
Ordnance maintenance: Inspection TM 9-1100
Ordnance maintenance: Lower carriage of 40-mm antiaircraft gun materiel M2 TM 9-1253
Ordnance maintenance: Remote control systems M1 and M5 TM 9-1643
Ordnance maintenance: Telescopes and directors TM 9-1652



A Page
Accessories, gun and carriage
  care and preservation 137
  description 266
Accidents (ammunition), field report of 265
  brakes 150
  computing sight 197, 201
  equilibrator 145
  for single fire 148
  rear firing pedal 147
  recoil cylinder control rod valve 108
  remote control system 224
  weapon 156
  wheel bearing 185
Ammeter (for electric brakes) 266
  authorized rounds 255
  care, handling, and preservation 254
  care in tropical climates 284
  data 5, 8, 12, 258, 260
  description 260
  firing 260
  fuzes 264
  identification, and firing tables 252
  loading in clips 112
  lot number 253
  marking 253
  packing data 264
  painting 254
Artillery gun book 266
  breech ring closing spring 176
  breechblock and breech ring 173
  computing sights 199
  gun (field strip) 179
  equilibrator 180
  wheels, hub, and brake drum 182
  description and functioning 85, 92
  malfunctions and corrections 127
  bearings, lubrication 134
    description 217
    differences among carriage models 12
    lubrication 251
  oil gears
    conversion 244
    lubrication 134
    adjustment 232
    description 217
Barrel assembly
  care and preservation 139
  cleaning 138
  data 12
  description and functioning 17
  carrier 267
  inspection 157
  installation 161, 180
  modifications 10
  precautions 15
  removal 161, 169
  replacement of abutment 179
Battery, dry-cell
  care and preservation 149
    in low temperatures 289
Bell housing (remote control system), precautions 16
Blocking (rail shipment) 282
Bore, gun
  data 12
  low temperature care 287
Bore sight, description and operation 205
  adjustment 150
  ammeter for electric brakes 266
  care and preservation (electric brakes) 149
    in low temperatures 288
  control set M2 (electric brakes) 268
  description and functioning
    electric brakes 93
    hand brakes 96
  inspection 160

B-Cont'd Page
  installation of drum 183
  malfunctions and corrections (electric brakes) 127
  operation 119
  rail shipment 280
  removal of brake drum 182
Breech mechanism
  care and preservation 140
  cleaning 138
  closing the breech 99
  cooling slots 11
  description and functioning 30
    casing 20
    side cover and lever 34
  firing mechanism, low-temperature care 288
  installation 180
  lubrication 134
  opening the breech 98
  operation 98
    automatic 36
    manual 35
  removal 169
  storage and shipment (cover) 279
  top cover damaged or broken 125
Breech ring
  assembly and disassembly 173
    closing spring 176
  description and functioning 23
    outer crank assembly 27
    safety plunger 30
  installation 179
    barrel catch 176
  removal 172
    barrel catch 175
  replacement of parts 178
  assembly and disassembly 173
  data 12
  description and functioning 26
    locking pin 22
  failure to close 121
  inspection 158
  low-temperature care 288
  modifications 10
  operation 35, 36
  removal and installation 164
C Page
Cable connections, remote control system 215
Canvas, care of 151
Care and preservation
  ammunition (tropical climates) 284
  carriage 144
  cleaners and preserving materials 151
  computing sights 204
  general instructions 136
  miscellaneous materials and tools 152
  paints and related materials 151
  tropical climates 284
  washing 152
Carriages M2 and M2A1 accessories 266
  care and preservation 144
  characteristics 8
  data 13
  description and functioning
    axles and suspension 85
    brakes 93
    chassis frame 80
    elevating mechanism 74
    equilibrators 76
    firing mechanism 79
    hubs, wheels, and tires 96
    lighting equipment 97
    oil gear units 79
    platform frame assembly 74
    power synchronizing mechanism 77
    top carriage 73, 82
    traversing mechanism 77
  differences among models 11
  emplacement (low-temperature) 288
  firing mechanism attached to 36
  inspection 158
  lubrication and cleaning
    in tropical climates 282
    in low temperatures 28,2,
  operation under unusual conditions 28
  precautions (firing position) 14
  steering 91
  storage and shipment 277
  authorized rounds 256
  clip release arrangement 51

C-Cont'd Page
    hand extractor 274
    rammer assembly 53
    remover 268
  operation of rammer assembly 53, 55
  partially ejected or not ejected case 124
  removal of case 117
  carriage M2 8
  gun M1 5
  care and preservation 146
    frame 80
    front chassis 89
    rear chassis 92
  lubrication 135
  precautions in use of spring lock handles 14
Cleaners and preserving materials 151
  all parts 131
  barrel exterior 138
  bore (after firing) 137
  breech mechanism 138
  domestic shipment 277
  in low temperatures 285
  remote control system, precautions 16
Clips (carriage) (See Straps and clips (carriage))
Cocking lever, inner
  description 37
  functioning 38, 40
  installation, and removal 173
  location of 26
  automatic firing cycle 63
  control speed of 115
  description and functioning 72
  failure to or violent 126
  slow 125
Crank assembly, breech ring
  description and functioning 27
  functioning during firing 40
  operation 35, 36
Crankshaft collar, breech ring, replacement 178
  ammunition 258, 260
    packing data 264
  carriages M2 and M2A1 13
  fuzes 264
  gun M1 12
  ammunition 260
  automatic firing cycle 60
  automatic loading
    control mechanism 55
    tray 52
  axles and suspension 85
  bore sight 205
  brakes 93
  breech casing 20
  breech operating mechanism 30
  breech ring 23
    barrel catch 25
    outer crank assembly 27
    safety plunger 30
  breechblock assembly 26
  chassis frame 80
  computing sights 192
  elevating mechanism 74
  equilibrators 76
  extractor assembly 30
  firing mechanism 36, 37, 79
  fuzes 264
  gun MI 17
  hubs, wheels, and tires 96
  lighting equipment 97
  oil gear units 79
  platform and frame assembly 74
  recoil mechanism 70
  telescopes M7 and M74 195
  top carriage 73
  traversing and power synchronizing mechanisms 77
Director dials, trouble shooting 234
  breech ring closing spring 176
  breechblock and breech ring 173
  computing sights 199

D-Cont'd Page
  equilibrator 180
  wheel, hub, and brake drum 182
  description and functioning 90
  inspection 160
  rail shipment 280
Dummy socket, differences among carriage models 11
Ejector, shell 275
Elevating mechanism
  adjustment of limit stops 231
  care and preservation
    elevating arc (in low temperatures) 287
    elevating rack and pinion 146
  description and functioning 74
    elevation clutch lever 216
    elevation limit switch 215
    elevation of gun 8
      by hand 109
      by power 111
  inspection 159
  lubrication of gear cases 135
  malfunctions and corrections 126
  adjustment 145
  assembly and disassembly 180
  description and functioning 76, 270
  lubrication 134
Extractor assembly
  description and functioning 30
    hand extractor 274
    spindle 270
  installation 167, 174
  removal 166, 173
Feed control
  check and release mechanism 57
  thumb lever to left (or right) 122, 123
Feed pawls (See Pawls; feed and stop pawls)
Feed rods, description and functioning 49
Feed rollers, description and functioning of rollers and catch and plunger mechanisms 50
Fire control (See Sighting and fire control equipment)
  cleaning the bore after 137
  description and functioning (automatic firing cycle)
    counterrecoil 63
    recoil 60
  failure to single fire 124
  functioning 40
  observations during 114
  operation prior to 111
  placing gun in position for 99
  positions of lever
    automatic fire 43
    safe and single fire 42
  precautions 13
  preparation for 260
  to fire the gun 40, 112
  to place in position for 99
  (See also Recoil and Counter-recoil)
Firing mechanism
  care and preservation 147
  data 12
  description and functioning 36, 79
    check and release mechanism 40, 59
    firing lever and pawl 41
    parts mounted on breech casing 41
    rammer catch mechanism 40
  lubrication 134
  parts attached to carriage 36
Firing pin
  data 13
  description 37
  functioning 40
  installation and removal 173
  low-temperature care 288
Firing tables 252
Flash hider
  description 17
  wrench 271
Fuzes, description and data 264

G Page
Gun M1
  accessories 266
  care and preservation 139
  characteristics 5
  data 12
  description and functioning 17
    gun stay 92
    junction box 215
    striker protrusion gage 277
  develops low top speed 234
  elevating 109
  field strip assembly 179
  field stripping 168
  inspection 157
  gun stay 160
  lubrication and cleaning
    low-temperature 284
    tropical climates 283
  modifications 10
  operation 98
    placing in firing position 99
    placing in traveling position 117
    prior to firing 111
    under unusual conditions 284
  register mark on gun tube 11
  rough or jerky in tracking 235
  serial number 156
  storage and shipment 277
  to unload 116
  traversing 108
  (See also Cocking; Firing; Loading mechanism; Recoil; and Counterrecoil)
description and functioning 96
  installation 183
  removal 182
Hydraulic oil gears, lubrication 134
  carriage 158
  gun 156
  purpose of 157
  serial numbers 156
  storage and shipment 279
  visual inspection upon receipt 156
J Page
  Jacks, leveling
  description and functioning 84
operation 118
Level assemblies, care and preservation 148
Lighting equipment
  care and preservation 150
  description and functioning 97
  devices 204
  inspection of lights 160
  malfunctions and corrections 129
  (See also Stop lights and Taillights)
Loader, automatic
  description and functioning control mechanism 55
    feed mechanism 44, 274
    hood and shield 267
    lifters 271
    loader 17, 22, 44
    loading tray 52
  feed rollers fail to rotate 125
  inspection 158
  installation 179
  lubrication 134
  precautions 15
  removal 169
  (See also Loading)
Loading 112
  for rail shipment 279
  malfunctions and corrections 122, 123
  precautions 13
  (See also Loader, automatic)
  azimuth indicator 251
  computing sights 204
  equipment 131
  for domestic shipment 277
  guide 130
  in tropical climates 283
  low-temperature 284
  oil can points 135
  points of application 131
  precautions 14
  remote control system 247
  reports and records 136
  supplies 130

M Page
Magnet, facing of 149
Malfunctions and corrections
  axles 124
  breechblock 121
  elevating and traversing mechanisms 126
  feed control thumb lever 122, 123
    fails to fire 122, 123
    misfires 120
  lights 130
  recoil mechanism 125
  remote control system 232
  wheels and tires 127
Misfire (gun) 120
Muzzle covers, storage and shipment 279
Oil can points 136
Oil gear
  conversion 244
  description and functioning 79, 215
  low-temperature care 288
  malfunctions and corrections 232, 233
  removal of units 236
  replacement of units 243
  arctic climates 284
  bore sight 205
  brakes 119
  breech mechanism 35, 36, 98
  cartridge rammer rod assembly 53, 55
  computing sights 197
  moist or salty atmosphere or sand or dust conditions 289
  remote control system M5 219
  tropical climates 283
  description and functioning 83
  differences among carriage models 11
  rail shipment (covers) 282
  ammunition 254
  lubrication devices 155
  paint and related materials 151
  preparation for painting 153
  removal of paint 155
  storage and shipment 278
Pawls, description and functioning
  catch release pawl 51
  feed and stop pawls 48
  firing lever pawl 41
Percussion mechanism
  description 37
  functioning 38
Placarding materiel 280
Platform and frame assembly, description and functioning 74
  description and functioning
  breech ring safety plunger 30
    key puller 270
    check plunger 38,40
    feed roller plunger mechanism 51
  installation and removal (check plunger) 173
  replacement (breech ring safety plunger) 178
Power shaft adapter gears and bearings, lubrication 134, 135
Power synchronizing mechanism 77
Rammer catch and check mechanisms 40
Rammer cocking lever shaft assembly, description and functioning 57
Rammer rod, cartridge, description and operation 52, 53
Rammer shoe, malfunctions and corrections 122, 123, 124
Ramps (loading for rail shipment) 279
  data 13
  maximum effective 5
  automatic firing cycle 60
  data 13
  description and functioning 70
  length of 141
  measuring length of 114
  slow, violent, or excessive in length 125

R-Cont'd Page
Recoil cylinder
  check liquid in 108
  emptying and exercising 142
  filling 141
  inspection 158
  installation 180
  low-temperature care 288
  modifications (fluid) 10
  removal 168
Recoil mechanism
  care and preservation 140
  care of oil 143
  description and functioning
    counterrecoil 72
    recoil 70
  lubrication 134
  malfunctions and corrections 125
Recuperator spring, description and functioning 17
Remote control system M5
  azimuth switch 232
  changing oil and renewing filter bobbin assembly 249
  description 206
  elevation limit stops 231
  lubrication 247
  maintenance precautions 16
  malfunctions and corrections 232
    faults and precautions 16, 223
    setting up and orienting 219
  tests and adjustments
    accuracy test, dither adjustment, and backlash 225
    neutral adjustment 227
    resetter spiral gear 228
    torque test 228
Reports and records, ammunition accidents 265
Rifling data 12
Safety lever, outer, functioning 42
Safety switch
  description and functioning 95
  differences among carriage models 11
Serial numbers (gun and tube) 156
Shell, description of
  ejector 274
  pusher 276
Shipment (See Storage and shipment)
Sighting and fire control equipment
  arrangement of 187
  direct fire sights 189, 191
  low-temperature care 288
Sighting system M3, carriages equipped with 12
Sights M7 or M7A1
  computing care, preservation, and lubrication 204
  carriages equipped with M7 12
  direct fire sights 189, 191
  description 192
  disassembly and assembly 199
  operation and tracking adjustments 197
  lighting devices 204
  precautions 15
  tests and adjustments 201
Spare parts, organizational 137, 265
Spring, closing, removal and installation 164
Steering (carriage) 91
Stop light
  care and preservation 150
  malfunctions and corrections 128
  replacement of lamps 150
Storage and shipment
  domestic shipment 277
  rail shipment 279
  limited storage 282
Straps, safety, precautions 14
Straps and clips (carriage), differences among carriage models 11
Suspension, description and functioning 85, 88
Taillights, replacement of lamps 150
Targets, tracking
  changing 223
  tracking 222
Telescopes M7 and M74
  care and preservation 205
  description 195

T-Cont'd Page
  care and preservation 148
    low temperatures 289
    tropical climates 283
  data 13
  description and functioning 96
  differences among carriage models 12
  inspection 160
  malfunctions and corrections 127
  precautions 15
  rail shipment 280
  removal and installation 185
Tools 152
Torque test, remote control system 228
  gun rough or jerky 235
  practice 224
  the target 222
Traversing mechanism
  description and functioning 8, 77
  lubrication of bearings and racks 134, 135
  malfunctions and corrections 126
  traversing by
    hand 108
    power 109
Tubes, gun
  care and preservation 148
  register mark 17
    modifications 11
Unloading the gun 116
Valve, pilot
  removal 235
  replacement 237
  adjustment of bearing 185
  care and preservation 150
  description and functioning 96
  differences among carriage models 12
  inspection 160
  installation 185
  lubrication of bearings 134
  malfunctions and corrections 127
  removal 182
Wiring connections, malfunctions and corrections 232



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