Stoner63a Lmg Manual

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Table o f Contents. . /

Parag ra phs PageCHAPTER 1 INTRODUCTION

Section r. Genera l ..... ... .... ..... ...... 1II Descri ption and data . . . . . . . . . . . . . 2 2

CHAPTER 2 . OPERATING INSTRUCTIONSSection r. Service upon receipt of materie l . . . . 5 5

II Controls . . . . . . . . . . . . 7 6I I I Operation under usual conditions . . . . 1 9

CHAPTER 3 . ORGANIZATIONAL MAINTENANCE INSTRUCTIONS- Section r. Repair parts tools and equipment . . . . . . . 22 13

II Lubrication . . . . . . . . 25 14I I I . Preventive-maintenance services . . 28 16IV. Troubleshooting . . . . . . . . . . . . . 30 18

CHAPTER 4. MAINTENANCE OF MACHINE GUN . . . . . . 32 21

APPENDIX r. REFERENCES . . . . . . . . . . 35APPENDIX II BASIC ISSUE ITEMS LIST . . . . . . . . . 36

APPENDIX I I I ORGANIZATIONAL MAINTENANCEREPAIR PARTS, AND SPECIALTOOL LIST . . . . . . . . . . . . . . . . . . . 4

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CHAPTER IINTRODUCTION

Section I. GENERALI. SCOPE

. . This manual contains instructions for operator and organizationalmaintenance of the Stoner light machinegun be lt-fed

J2 Appendix I contains a list of current references and publicationsapplicable to this materiel.

Appendix II contains a l ist of basic issue items repair parts andtools and equipment which are required for operational maintenance ofthe weapon.

g Appendix contains a list of repair parts special tools andequipment which are required for performing o rganizationa l maintenanceof the weapon.


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Section II. DESCRIPTION AND DATA

2. DESCRIPTION2.. The Stoner light machinegun belt-fed) is s .Sfimm automatic

weapon figure 1 . The ammunition is fed into the weapon by means ofa disintegrating metallic link belt . The weapon fires from the open-boltposition and features a quick-change barrel. The operational energy isprovided by the gas from the fired round.

b. Sights are adjustable in 1/4 mil increments in windage andelevation and are graduated on a scale from 200 to 1100 meters. Thefully-adjustable front sight can be zeroed to the rear sight in bothwindage and elevation.

3. NAME AND SERIAL NUMBERThe name and serial number of the weapon are stamped on the bottom

of the receiver in front of the trigger housing figure 14 .

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FIGURE 1. STONER LIGHT MACI-IINEGUN. BELT-FED LEFT AND RIGHT VIEW


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4. TABULATED DATAa . Weight in pounds) .

Light Machinegun, belt-fedFull plastic ammunition box 100 rounds)SlingFlring Weight 100 rounds, sling and bipod)Bayonet knife, M7Scabbard, M8AlBipodBipod case

b. Lengths in inches) .Light Machinegun, belt-fedLight Machinegun , belt-fed, with bayonetBarrel bolt face to muzzle)Barrel with Extension Flash Suppressor

c Mechanical FeaturesRifling

Bore diameter maximum)Groove diameter maximum)Sight Radius

Trigger PullMaximumMinimum

Method of OperationType of Lock MechanismMethod of Feeding

Coolingd. Ammunition

Calibe:Type

11.68 lbs.3.31 lbs.0.31 lbs.

l 6 l8 lbs0.60 lbs.0.30 lbs.0.88 lbs.0 3 l lbs

40.25 in.45.65 in.20.00 in .21.67 in.

Right Hand Twist6 grooves ) ,

one turn in 12 in..220 in..2245 in.22.25 in. fromrear of rear sightaperture to midpOint of front sight)9 lbs.6 lbs.GasRotating boltBe lt feed , disintegrating metalliclinkAir

5.56mm .223 caliber)Ball, tracer andblank.

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e , Firing Characteristics.Muzzle VelocityMuzzle EnergyChamber PressureCyclic Rate of FireMaximum Sustained Rate of FireMaximum Effective Rate of FireMaximum RangeMaximum Effective Range

3250 fps 40 fps1300 ft. Ibs. approx)50,000 2000 psiVariable from 700to 1000 rds. per min.75 - 125 rds. per min.150-200 rds. per min.2895 yds. 26 53 meters1203 yds 1100 meters

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Section II. CONTROLS

7. GENERALThis section describes, locates, and illustrates the various controls

provided for the operation and organizational maintenance of the weapon.

8. WEAPON CONTROLSa. Barrel Latch. The barrel latch (figure 2) is located on the top of

the weapon to the front of the feed cover. It consists of three parts,latch, lockpin and spring assembly. Attached to the rear of the latch isthe locking pin which locks and holds the barrel into position.

Q Cocking Handle. The cocking handle (figure 2) is located onthe right side of the receiver. This control allows for manual cockingof the weapon when required. The cocking handle spring (figure 19) locksthe handle In its forward position.

. Safety. The safety is located Just forward of the trigger (figure 2) When pushed all the way forward through the slot in the trigger guard,the safety Is In . the OFF or FIRE position. When pulled all the wayto the rear, towards the trigger, it is in the SAFE position. Thissafety can be moved off safe without removing the trigger finger fromthe trigger guard by pushing forward with the trigger finger.

Q Selector Lever. The selector lever (figure 11) is located on theleft side of the trigger housing group above and to the rear of the trigger.t is movable to two positions , Auto and Semi . The weapon will fire

automatically with the lever in either position.

OVER ,

EJECTION ,__PO)1. r.. V ~ R __ _

FIGURE 2. BARREL LATCH, FEED COVERLATCH. TRIGGER, AND COCKING HANDLE

FIGURE 3. REAR SIGHT--RAISED POSITION-


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l.. Trigger. The trigger (figure 2) is located below the receiverdirectly under the rear sight. Its function is to control the firing of theweapon with the selector lever in the Auto or Semi position.

i. Feed Cover Latch . The feed cover latch (figure 2) is locatedon the upper right rear end of the feed cover. The function of thelatch is to secure the cover in the closed position. Pushing the latchforward unlatches the feed cover from the receiver.

9,. Rear Sight. The rear sight (figure 3) has two controls and a battlesight .

1) Elevation knob. The elevation knob (figure 3) is located onthe right side of the leaf sight. The function of the knob is to providefine vertical adjustment of the sight.

2) Windage knob. The windage knob (figure 3) is located onthe left side of the sight base . The function of the knob is to provideaccurate lateral adjustment.

3) Battle sight. The battle sight (figure 3) is located on thebase of the leaf sight and is used when the leaf sight is in the down positionand corresponds to the leaf sight set at a range of 200 meters.

Q Front Sight. The elevation adjustment for zeroing the weapon is inthe front sight base (figure 4), and adjustments are made by using thetip of a cartridge. To raise or lower the front sight post, depress thedetent at the base of the front sight post and turn the post in the desireddirection. To move the pOint of Impact up, turn the sight post in thedirection of the arrow and the word UP stamped on the base .

1 Adjustable gas valve. The adjustable gas valve is located in thefront sight base (figure 5 and 6). The valve can be set to anyone ofthree posit ions. By inserting the point of a cartridge into the hole overthe valve lock detent (figure 5), and pushing down on the detent, youunlock the valve which then may be moved one way or the other dependenton which size gas port setting is desired. The slowest rate of fire isobtained when the narrowest indicator notch is set over the valve lockdetent and the detent allowed to lock the valve In place. The threeindicator notches are sized according to the size of the gas port alignedwith the gas port in the barrel. The widest notch Is used when the fastestrate of fire Is desired. This valve may be removed for cleaning purposesby rotating the valve (figure 6) until the flat exposes the roll pin. Thenpush the valve out from the left side.9 . BIPOD

2.. Spring Control. The clamping action of the bipod (figure 7) iscontrolled by two springs, one spring mounted Inside of the other. Thesprings are located directly beneath the blpod hinge.

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Section II. OPERATION UNDER USUAL CONDITIONS

10. GENERALThis section contains instructions for the operation of the weapon

under conditions of moderate temperatures and humidity. Instructionsfor operation under these conditions are covered in paragraphs 25 through27.11. PREPARATION FOR FIRING

. .. The light machinegun, belt-fed, may be fired from the prone,sitting, hip, or standing position. When using the bipod, the bipod willbe clamped to the front of the gas cylinder (figure 8 .

Q Check all ammunition to be sure it is the proper type and gradeand that it is aligned within the belt.

Check weapon to see i i t has been thoroughly cleaned andlubricated.12. SERVICE BEFORE FIRING

Perform the before-firing operations as described in Table 2.13. LOADING

. .. Loading the Plastic Ammunition Box. The plastic ammunitionbox (figure 9 has a 100 round capacity and may be loaded with anyamount up to that capacity.

. FIGURE 8. INSTALLATION OF BIPOD

LINKED

FIGURE 9. LINKED AMMUNITION INSTALLEDON FEED TRAY

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Q. Loading the Weapon. The rounds should be securely assembledand positioned in their push-through type l inks, Set the safety on Safe ,pull the cocking handle to the rear, return the cocking handle to its lockedposition. Unlatch and raise the feed cover (figure 9). The feed trayshould remain down on the receiver. Remove the cover from the plasticammunition box and insert it in the other side of the box leaving it partlyopen. Attach the box to the tray, place the linked belt on the feed tray(figure 9 with the first round to be fired in the feed groove. The feed ,tray belt-holding pawl will then engage the second round. The ammunitionbelt must be positioned with the open side of the links facing down topermit stripping of the cartridge from the link. Close the ammunition boxcover completely. Close the feed cover, making sure that it is latch edsecurely.14. ZEROING

The weapon will be zeroed in accordance with instructions containedin FM 23-67.15. FIRING WEAPON

WARNING: MAKE SURE THE SAFETY IS IN THE SAFE POSITION WHENTHE WEAPON IS NOT BEING FIRED. With the weapon loaded and aimed,set the safety lever forward to i ts Off position, and pull the trigger. Theweapon will continue to fire until the belt is exhausted or the trigger isreleased. When the belt is exhausted, the last two links of the beltwill remain in the feed tray, and must be removed by hand when the coveris opened to reload.NOTE: THE WEAPON FIRES AUTOMATICALLY WHEN THE SELECTOR LEVERIS IN EITHER THE SEMI OR AUTO POSITION.16. MISFIRE, HANGFIRE, AND COOKOFF

E.. Misfire. A misfire is a complete failure to fire. A misfire initself is not dangerous but, since it cannot be immediate ly distinguishedfrom a delay in the functioning of the firing mechanism or from a hangfire(h below), it should be considered as a possible delayed firing untilsuch possibility has been eliminated. Such delay in the functioning of

. the firing mechanism, for example, could result from the presence offoreign matter such a grit, sand, frost, ice, or improper or excessiveoil or grease which might create initially a partial mechanical restraintwhich, after some indeterminate delay, is overcome and the firing pinis then driven into the primer in the normal manner. In this connection,no round should be left in a hot weapon any longer than the circumstancesrequire because of the possibility of a cookoff Q below). Refer toparagraph 7 for removal procedures.


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.Q. Hangfire. A hangfire is a delay in the functioning of a propellingcharge at the time o f firing. The amount of delay is unpredictable but,in most cases, will fall within the range of a split second to severaiseconds. Thus, a hangfire cannot be distinguished immediately froma misfire and therein lies the principal danger of assuming a failure ofthe weapon to fire immediately upon actuation of the firing mechanism isa misfire, whereas, in fact, it may prove to be a hang fire .WARNING: DURING THE PRESCRIBED TIME INTERVALS THE WEAPON WILLBE KEPT TRAINED ON THE TARGET. ALL PERSONNEL WILL STAND CLEAR .OF THE MUZZLE. REFER TO PARAGRAPH 17 FOR REMOVAL PROCEDURES.

Cookoff. A c ookoff is a functioning of any or all of the explosivecomponents of a round chambered in a very hot weapon due to the heatof the weapon. If the primer or propelling charge should cookoff, theprojectile may be propelled from the weapon with normal velocity eventhough no attempt was made to fire the primer by actuating the firingmechanism. In such a case, although there may be uncertainty as towhether or when the round will fire, the precautions to be observed arethe same as those prescribed for a hangfire Q above . To prevent acookoff, a round of ammunition which has been loaded into a very hotweapon should be fired or removed after the round is in the weapon 5seconds. Refer to the following paragraph for removal procedures.17. PROCEDURES FOR REMOVING A ROUND IN CASE OF FAILURE TO FIR

General. After a failure to fire, due to the possibility of ahang fire or cookoff, the following general precautions, as applicable,will be observed until the round has been removed from the weaponand the cause of failure determined.

1) Keep the weapon trained on the target. All personnel willstand clear of the muzzle.

2) Before retracting the bolt, either to remove the round orrecock the weapon, personnel not required for the operation will becleared from the immediate vicinity.

3) The round, after removal from the weapon, will be keptseparate from other rounds until it has been de termined whether theround or the firing mechanism was at fault. f i t is determined that theround is at fault, it will continue to be kept separated from other roundsuntil disposed of. On the other hand, i f examination reveals that thefiring mechanism was at fault, the round may be reloaded and firedafter correction of the cause for failure to fire.

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CHAPTERORGANIZATIONAL MAINTENANCE INSTRUCTIONS

Section 1. REPAIR PARTS TOOLS AND EQUIPMENT22. GENERAL

Repair parts tools and equipment are issued to the using organizationfor operating and maintaining the m ateriel. Tools and equipment should notbe used for purposes other than prescribed and when not in use should beproperly stowed.23. REPAIR PARTS

Repair parts are supplied to the using organization for replacement ofthose parts most likely to become worn broken or otherwise unserviceablewhen replacement of these parts is authorized to the using organization.Repair parts supplied to the using organization are listed in Appendix IIwhich is the authority for requisitioning replacements. Repair parts suppliedfor organizational maintenance are listed in Appendix III.24. SPECIAL TOOLS AND EQUIPMENT

Special tools are listed in Appendix III.

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26. GENERAL LUBRICATION INSTRUCTIONS2 Usual Conditions. Lubrication intervals specified in Table I are

for normal operation and where moderate temperature and humidity prevail.12 Reports and Records. Report unsatisfactory performance of

materiel or effect of prescribed lubricants and preserving materials.27. SPECIFIC LUBRICATION INSTRUCTIONS

2 General. Lubrication will be performed more frequently thanspecified in table 1 to compensate for abnormal operation and extremecondltons such as high or low temperatures prolonged periods ofhigh-rate operation or continued exposure to moisture anyone ofwhich may quickly destroy the protective qualities of the lubricant.

12 Changing Grade of Lubricants. Lubricants are prescribed inaccordance with temperature ranges: above OOF. and below OOF.The time to change the grade of lubricants is determined by maintaininga close check of the operation of the weapon during the approach tochangeover periods in accordance with weather forecast data. Ordinarilyit will be necessary to change grade of lubricants only when air temperature is consistently above or below OOF.

Q Extreme Cold Weather; Apply a light coat of weapons lubricating oilLAW) to all operating mechanism surfaces. Materiel should be exercised

more frequently during periods of low temperature to insure proper functioning.Q Extreme Hot Weather. Special lubricants will ordinarily not be

required at extremely high temperatures as lubricants prescribed fortemperatures above OOF. provide adequate protection. However morefrequent servicing than specified in Tables 2 and 3 Is necessary becausethe heat tends to dissipate the lubricants.

Humid and Salt-Air Conditions. High humidity moisture or sal tair contaminate lubricants necessitating more frequent service thanspecified in Tables 2 and 3.

1. Before Immers ion. Lubricate materiel before amphibious operationas prescribed in Table 1

9 After Immersion. After immersion perform the maintenance desscribed in paragraph 28 and 34.

n SandY or Dusty Conditions. f firing or prolonged travel has occurredunder dusty or sandy conditions clean and inspect all lubricated surfacesfor fouled lubricants. Lubricate as necessary.

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Section III. PREVENTIVE - MAINTENANCE SERVICES

28. SPECIFIC PREVENTIVE - MAINTENANCE PROCEDURES FOR THE OPERATORTable 2 gives the specific procedures to be performed on the weapon

by the operator for each dally service.Table 2. OPERATOR'S PREVENTIVE MAINTENANCE CHECKS AND SERVICES

Interval & Sequence No OPERATOR - DAILY SCHEDULE

Q 0> 0>0> ... 0> Item to be"" - Q ".B- Inspected Procedures Paragraph"'. :: ,,-


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29. PREVENTNE MAINTENANCE BY ORGANIZATIONAL MAINTENANCE PERSONNELRefer to Table 3 .

SequenceNo

I

2

3

4

5

7

Table 3. WEEKLY PREVENTNE MAINTENANCE SERVICESORGANIZATIONAL MAINTENANCE PERSONNEL

Item Procedure

Barrel Assembly Check for unusual wear and damage tobore.

Barrel Assembly Check for evidence of metal foulingcorrosion and use of unauthorizedcleaning material and methods .

Inertia Pin Check to determine if the inertia pinhas free movement inside the gaspiston .

Action Parts Check for smoothness of operation.Visually examine moving parts forunusual wear.

Action Parts Check for corrosion and damage.Lubrication See that all items have been lubri-

cated as prescribed in paragraph 25.Equipment See that tools and equipment are

serviceable cleaned and properlystowed.

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Section IV TROUBLESHOOTING30. SCOPE

This section contains troubleshooting information and tests for locating and correcting some of the troubles which may develop in the weapon.Troubleshooting is the systematic study of trouble signs, testing to determine the defective component, and applying corrective action. Eachmalfunction is followed by probable causes and suggested procedures tobe followed.31. TROUBLESHOOTING GUIDE

Table 4 is intended to be used only as a guide in troubleshooting.This table does not cover all possible malfunctions that may occur; onlythe more common malfunctions are listed. The tests and corrective actionsare governed by the scope of the operator or organizational level of maintenance.

Table 4. TRO\JBLESHOOTlNG GUIDE

Malfunction Probable causes Corrective actionFailure to feed. 1 Dirty or carboned 1 Clean gas cylinder.

cylinder.2. Lubrication inade- 2. Apply lubricant as

quate. required.3. Obstruction by 3. Remove item block-

foreign subs tan- ing movements,ces or material clean and lubricatein receiver. as required.

4. Defective link 4. Insert new ammuni-or ammunition tion or l ink.

S. Ammunition belt s Install correctly.installed wrong.

6. Unlatched feed 6. Latch.cover

7. Damaged or 7. Refer to higherweak driving echelon direct support)spring assembly. for corrective action.

8. Defective feed 8. Refer to higherpawl or spring. echelon direct support)for corrective action.


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--. . . / Table 4. TROUBLESHOOTING GUIDE continued)

Malfunction Probable causes Corrective action

9. Defective cover 9. Refer to higherlatch. echelon direct support)for corrective action.

Failure to cycle. 1. Frozen ejector. 1. Disassemble andclean.2. Insufficient gas. 2. Clean gas cylinder.

Move adjustablegas valve to nextlarger setting.3. Faulty selector. 3. Refer to higherechelon direct support)for corrective action.

Failure to fire. 1. Faulty ammuni- 1. Remove and replacetion. ammunition.

2. Dirty chamber. 2. Clear and clean .3. Broken or damaged 3. Replace.

firing pin.4. Damaged or weak 4. Refer to higher echelon

driving spring direct support) forassembly. corrective action.

Failure to extract. 1. Short recoil . 1. Move adjustable gasvalve to larger setting.2. Broken extractor 2. Refer to higher echelon

or spring. direct support) forcorrective action.

Failure to chamber. 1. Ruptured cartridge 1. Remove.case.2. Damaged round . 2. Recharge weapon.

Failure to eject. 1. Short recoil. 1. Move adjustable gasvalve to next largersetting.2. Frozen or damaged 2 . Refer to higher echelonejector. direct support) forcorrective action.

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Table 4. TROU BLESHOOTING GUIDE continued)

Malfunction

Failure to cock.

Uncontrolled fire.

Probable causes

1 Short recoil.

2. Obstruction inreceiver

3. Broken sear .

4. Deformed searnotch.

1 Broken or wornsear

2. Worn searnotch.

Corrective action

1 Move adj ustablevalve to nextlarger setting.

2. Clean as required.3. Refer to higher

echelon directsupport) forcorrective action.

4. Refer to higher echelondirect support) for

correcti ve action.1 Refer to higher echelon

direct support) forcorrecti ve action

2. Refer to higher echelondirect support) for

corrective action


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33. DISASSEMBLY . Inspection for' Safe Condition .

(1) Move the safety to the Safe position , (figure 11).2) Pull the cocking handle on the right side of the receiver

to the rear until the action is locked open.3) Return the cocking handle to the forward, locked pos iUon.4) Push forward on the cover latch handle (figure 2) and raise the

cover5) Look in the receiver and chamber to be sure that the weapon is

cleared of all ammunition and is safe to disassemble.6) Move the safety to the Off'br forward position, (figure 12).7) Close the cover and pull the cocking handle to the rear, sti l lholding the cocking handle, pull the trigger, then ease the bolt forward,

closing the action.12. Removing the Driving Spring, Carriero Piston and Bolt Assemblies .

1) With the bolt closed and the safety on" Safe'; push the takedown pin out (figure 11 .

2) Holding the weapon with the left hand under the receiver,muzzle pOinting down, pull the take-down pin with the right hand until thetrigger housing group is free to pivot downward (figure 12) .NOTE: THE TAKE-DOWN PIN SHOULD NOT BE REMOVED FROM THE TRIGGERHOUSING GROUP.

(3) Still holding the open weapon in the left hand, grasp thedriving spring and remove (figure 12) .

DRIVING SPRING_

I. ~ .. {TRII3Gam HOU?INGFIGURE 11. DISENGAGING THE

I . TAKEDOWN PIN FIGURE 12 REMOVING THE DRIVING SPRING


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4) Place the right hand over the back of the receiver and rotatethe muzzle up slowly. The carrier, piston and bolt assembly will slideout of the receiver figure 13)

Q Removal of tn Trigger Housing Group from the Receiver Group .I) Unscrew the pivot pin screw from the pivot pin nut, and remove

figure 14) .(2) Remove the trigger housing group from the receiver group.Q Removal of the Feed Cover, Feed Tray, Barrel. Cocking Handle

and Forestock Assemblies from the Receiver Group.(l) Uncrew the pivot pin screw from the pivot pin nut, and remove

figure IS). Push forward on the cover latch handle. Raise the cover andremove the feed cover and feed tray assemblies figure 16)

(2) Unscrew the fore stock pivot pin screw from the pivot pinnut figure 17 and remove the forestock assembly.

_RECENER

NAME Al:


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2) Remove the firing pin from the bolt carrier figure 22 .3) Push the bolt into the carrier, and remove the cam pin

from the bolt figure 23 .4) Remove the bolt from the bolt carrier.

NOTE: THE FIRING PIN MUST NOT BE USED AS A TOOL. IT IS USELESSWHEN BENT OR TIP IS BROKEN OFF.i . Removal of the Stock from the Trigger Housing Group.

1) To remove the stock from the trigger housing group, removethe s tock retaining pin figure 24 .

2) Rotate the bottom of the stock upward and remove.

BOL CARRIER

FIGURE 21. CA-RRIEIf-CAP I i S s E r ~ r B L Y H r i i N EWITH TOP OF BOLT CARRIER

FIGURE 23. REMOVING CAM PIN FIGURE 24. REMOVING THE SRETAINING PIN

NOTE: THE WEAPON HAS NOW BEEN DISASSEMBLED TO THE EXTENTAUTHORIZED THE OPERATOR WITHOUT SUPERVISION. FURTHERDISASSEMBLY SHOULD BE DONE ONLY BY. OR UNDER THE SUPERVISION OF. ORGANIZATIONAL MAINTENANCE PERSONNEL.

G PIN:

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LOCK PlATE~ .

FIGURE 29. LOCK PLATE REMOVED

L

LREMOVING THE SAFETY

FIGURE 31. DEPRESSING EJECTOR DETENT FIGURE 32. EJECTOR ASSY REMOVED(4) Remove the lock plate by grasping the extended front edge

and remove figure 29 .5) Remove the safety by grasping it and pulling it to the rear

and down through the trigger guard figure 30 .Q Removal of the Ejector Assembly.

1) Depress the ejector detent figure 31) .2) Slide the lock plate as ide.3) Pull out the ejector assembly figure 32

NOTE: THE WEAPON IS NOW DETAILED-STRIPPED AS FAR AS PERMITTEDUNDER SUPERVISION OF ORGANIZATIONAL MAINTENANCE PERSONNEL.SEE FIGURE 33. FURTHER DISASSEMBLY IS RESTRICTED TO DIRECTSUPPORT PERSONNEL ONLY.

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34. CLEANING, INSPECTION AND REPAIRCleaning and Ins pectlon.

I) Cleaning Materials.@) Bore cleaner is used for cleaning the bore, chamber, barrel

extension, and gas cylinder. t also provides temporary protection from rust .Q) Hot, s oapy water or plain hot water is a substitute for bore

cleaner. (f) Dry-cleaning sGlvent is used for cleaning weapons whichare coated with grease, oil, or corrosion-preventative compounds.CAUTION: USE WARM SOAPY WATER TO CLEAN THE BUTTSTOCK AND FORE-STOCK. SOME CLEANING SOLV NTS AND GASOLINE TEND TO SOFTENAND DISTORT THE PLASTIC MATERIAL,

2) Lubric a nts.@) Special preservative lubricating oil is used for lubricating

the weapon at normal and low temperatures.Q) Medium preservative lubricating oil is used instead

of special preservative oil when the weapon is exposed to high temperatures, high humidity, oc sal t water.

(f) Lubriplate grease should be applied to workingsurfaces in extremely humid weather or whenever there is a likelihood

that the weapon will be subjected to immersion in either fresh or sal twater. After immersion in either fresh or sal t water, the weapon shouldbe cleaned and lubricated as soon as possible.

3) Eguipment furnished for cleaning the weapon.@) Cleaning rod (figure 34Q) Bore cleaner(f) Rifle oil@ Brushes(ill Cleaning patches.

(Satisfactory caliber 5 .S6mm patches can be obtainedby cutting .30 caliber patches into quarters.


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('- ( (

3. Cam PinI

r1 Firing Piri

5 . Carrier and Pis ton iAssembly t Feed Cover Pivot

4. Bolt As sembly 5 ' 2. Driving Spring Assembly. . . 1 .

6 .

7. Adjustable GasValve

'D

.-a::__ L:a' Pin Nut and Screw~ 1 0 Feed TrayAssembly

12. Ejector Lock Plateo 9.13. Ejector Assembly FeedCover I I IAssembly 14. Buttstock Assembl

,15. Cocking HandleAssembly Hous ing PivotlPin.Nut and Screw 16. Butt, i Retaining PinTTTTZTT I I

17. Forestocl< s sembly .

J Bmn w; u ll23. Lock Pl

Trigger HousingCoverk \. \ , , )zS. Tri24 Trigger Pins1. Sa f e t y18. Forestock Pivot Pin

Nut and Screw 20. Trigger HousingAssembly

FIGURE 33. LIGHT MACHINEGUN BELT-FED) DETAIL-STRIPPED

/ ,/


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Chamber. Using a suitable brush figure 34 cleanthe chamber. Dry the chamber with a clean dry patch.

1 Barrel Extension. Using a suitable brush figure 34clean the lugs of the barrel extension. After removing the carbon,particles of dirt and/or brass filings, oil the barrel extension lugslightly.

i Variable Gas Valve Remove the gas valve, and withan appropriate wire brush, clean out the slots of all carbon and/orfouling.

... Gas Port. Using a suitable reamer figure 35 cleanthe gas port in the barrel removing any carbon buildup .

... Gas rings on boss of Front Sight Base. Soak bosswith bore cleaning solvent and wire brush to remove all fouling untilthe rings can move freely.

Z Gas cylinder. Using a suitable brush figure 34clean the gas cylinder. Dry the cylinder bore with clean dry patches.Use no abrasives in cleaning the cylinder and do not oil the interiorsurfaces.

... Gas Piston. Saturate patches with bore cleaner andwipe the exterior surface of the piston as clean as possible. The pistondoes not need to have a shiny surface to function properly. Do not useabrasives to clean the piston.1. Bolt Face. Clean the face of the bolt with a patchand bore cleaner. Remove the bore cleaner with a dry patch, and oilthe bolt lightly.

lQ Bolt Carrier. Remove all carbon and foreign materialsfrom the bolt carrier with a patch dampened with bore cleaner. Wipeoff the bolt carrier with dry patches and apply a light coat of oil .

11 Receiver Assembly and Trigger Housing Assembly.Inspect both assemblies for dirt and brass filings. Clean both assemblieswith a suitable brush figure 34 and oil all surfaces lightly. Place a dropof oil on each of the pins in the trigger housing assembly for lubrication.

E Ejector. The ejector is spring actuated. t isimportant that it have free moveme nt. Lightly oil ejector assembly beforeinserting it into the receiver recess . Visually inspect and manuallyoperate for proper function. Dirt, brass filings, or lack of lubricationmay hinder proper function.

12 Replacement of parts. All replacement parts Appendix III areinterchangeable and require no adjustments when being installed inthis weapon.

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'

}ll.~ ? ; < \ ; ; : I

' ~ , r ,. , ',;Ji il1. Slotted t ip for Cleaning Rod 8. Utility Brus h2, Cleaning Rod 3 Sections) . 9. Chamber Brush3. Cleaning Rod Adaptor for Brush 10. Barrel Extension Brush4 . Bore Cleaning Brush l l . Oiler5. Combination Tool 12. Spare Barrel6. Receiver Brush 13. Carrying Case7. Gas Cylinder BrushFIGURE 34. CLEANING EQUIPMENT, COMBINATION TOOL,SPARE BARREL, AND CARRYING CASE.

35. ASSEMBLYNOTE: THE WEAPON SHOULD BE ASSEMBLED IN THE REVERSE ORDER OFDISASSEMBLY.

2.,. Installation of the Ejector Assembly figure 32).I

1) Insert the ejector with the ejector spring and detent intothe recess of the receiver.

2) Depress the ejector detent and spring below the lock platerecess and insert the lock plate in the slots of the receiver.

3) Slide the lock plate over the detent until the detent popsinto the hole in the lock plate figure 31)


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Assembly of the trigger housing grouP.1) Place the lock plate in the left side of the trigger housing

group (figure 26), insuring that the lock plate is positioned on the twolock plate guide pins. The lock plate must remain forward during assemblyof the trigger housing group.

2) Place the safety into its proper position inside the triggerguard and slide it forward.3) Depressing the rear of the sear , insert the trigger from the

top of the trigger housing and replace the trigger pin (figure 28) .4) Replace the trigger housing cover (figure 27), and the remain

ing trigger pins. (Trigger pins are interchangeable) 5) Align the trigger pins, and push the extended edge of the

lock plate to the rear. The front edge of the lock plate should be flushwith the forward edge of the trigger hOUSing, and the lock plate tang shouldbe seated in the lock plate tang hole (figure 25) .

.9.. Assembly of the Stock to the Trigger Housing Group.1) Replace the stock by inserting it in the rear of the trigger

hous iilg group.2) Insert the stock retaining pin (figure 24) .

Q Assembly of the Ca rr ier-Piston Assembly.1) Re place th e bolt in the bolt carri er with the ej ector groove in

the bolt facing toward the cam track in the bolt carri er .2) Ins ert the cam pin through the cam track and into the cam pin

hole in the bolt. The flat side of the cam pin guide lug must be in linewith the lower side of the bolt carrier (figure 22) .

3) Replace the firing pin in the bolt carrier and pushing in on therear of the firing pi , rotate the carrier cap assembly 1/4 turn clockwis elocking the firing pin in the forward position.NOTE: FIRING PIN MUST BE PUSHED IN WHILE TURNING CARRIER CAP.

Assembly o f the Cocking Handle, Barre l . Feed Tr a y, Feed Cov er,and Forestock Assemblies with the Receiver Group .

1) Replac e th e o k i ~ g handle (figure 19), by aligning the disassembly notches with the cocking handle guide and lug.

2) Replace the barrel assembly by depressing the barrel latchand inserting the barrel into the receiver group (figure 18) insuring that thesight boss is aligned with the gas cylinder. Lock the barrel into place byreleasing the barre l latch.

3) Replace the feed tray assembly (figure 16) .4) Replace the feed cover assembly and insert the feed cover

pivot nut and screw (figure 15) .5) Replace the forestock assembly and insert the forestock pivotnut and screw (figure 17) . 33


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1.. Replacing the Trigger Group to the Receiver Group.1) Align the trigger housing group and receiver holes, and insert

the pivot pin screw and nut (figure 14)I

sr Replacing the Driving Spring, Carrier, Piston and Bolt Assemblies.1) Align the piston rod with the gas cylinder and insert the bolt

carrier in the matching grooves of the receiver. The bolt cam pin mustbe in line with the top rail of the bolt carrier before inserting the assemblyinto the receiver.

2) Hold the receiver with the gas cylinder pointing down and allowthe assembly to slide in as far as t can go.

3) Insert the driving spring (figure 12) assembly into the recess inthe piston rod.

4) Pull the takedown pin (figure 11) out as far as t will go.5) Rotate the trigger housing group up (figure 12) and lock it to

the receiver group by pushing the takedown pin in.h Functioning tes t .

1) A function test will be performed after assembly of the weapon.2) A function check of the weapon consists of checking its

operations while the safety is in the Safe and Firing positions. Thefollowing sequence wili be followed:

a. Clear the weapon Place the safety on Safe . Pull thecocking handle to the rear. Return the cocking handle to its locked position.Pull the trigger. The operating parts should not go into battery.

b. Place the safety in its forward Off position. Pull thetrigger. The operating parts should go into battery

. 1; ..

FIGURE 35. CLEANING GAS PORT36. MAINTENANCE OF BIPOD

The only maintenance required to be performed on the bipod assemblyis the normal cleaning and inspection of the adjustable legs, the hingespring, and bipod lock.


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APPENDIX IREFERENCES

The following references should be consulted for additional procedures for the maintenance of the materiel covered by this publication.FM-23-67FM-3l-70TM 9-207

Machinegun 7. 62mm M60.Basic Cold Weather Manual.Operation and Maintenance ofArmy Material in ExtremeCold Weather OaF to -65F.

-

35


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OURCE, MAINT.AND

RECOVERABILITYa) .

,o~''''w

CODEb) rJ.c) IE d)0 0-1' Z >-


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40

1. GENERAL

APPENDIX IIII .

ORGANIZATIONAL MAINTENANCE REPAIR PARTSAND SPECIAL TOOL LIST

Section 1. PREFACE

This appendix lists all items required or authorized for organizationalmaintenance.2. EXPLANATION OF COLUMNS

.2.. Figure and Index Number. This column lists the figure and indexnumber in this manual which illustrates the item.

Q Description. This column lists the repair part or tool with itsbi lsic nomenclature.

Quantity per Unit. This column lists the quantity of the itemused on each weapon.

Q Quantity Authorized. This column lists the quantity of eachitem recommended for stockage at the organizational level per weapon.Where a large quantity of weapons 50 or more is assigned to anorganizational unit. standard allowance percentages should be used.

-'


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Section II. ORGANIZATIONAL MAINTENANCE REPAIR PARTS AND SPECIAL TOOL LIST'--./

ILLUSTRATION .t: QTY.DESCRIPTION~

AUTH.FIG. ITEM 0NO. NO. a:''

REPAIR PARTS FOR LIGHT MACHINEGUN-BELT-FED33 7 Adjustable Gas Valve . . . . . 133 6 Barrel Assembly . 133 4 Bolt Assembly 133 14 Buttstock Assembly 133 16 Buttstock Retaining Pin Receiver Pin . . . . . . . . 133 3 Cam Pin 1 133 5 Carrier and Piston Assembly . . . 133 15 Cocking Handle Assembly 133 2 Driving Spring Assembly 133 12 Ejec tor Lock Plate . . . 133 13 Ejec tor Assembly . . . . 133 9 Feed Cover As sembly . . . . . . 133 8 Feed Cover Pivot Pin Nut and Screw . . . . . . . 1 133 10 Feed Tray As sembly . . 133 1 Firing Pin 1 133 17 Fores tock Assembly . . . 133 18 Forestock Pivot Pin Nut and Screw . . . . 1 133 23 Lock Plate . . . . 133 21 Safety . . . 133 25 Trigger 133 24 Trigger Pins . 1 433 22 Trigger Housing Cover . 133 20 Trigger Housing Assembly . . . . . . . 133 19 Trigger Housing Pivot Pin Nut and Screw . . 1

SPECIAL PURPOSE TOOLS34 5 Combination Tool . . . . . . . . . . 1

1 or more per Organizational Unit, as required.

Stoner63a Lmg Manual

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