COVER M240 Machine Gun Manual TM 9 1005 313 10

ARMY TM 9-1005-313-10

AIR FORCE T.O. 11W2-6-5-1

MARINE CORPS TM 08670A/09712A-10/1B

NAVY SW360-AH-OPI-010

Supersedes copy dated 19 July 1996

OPERATOR'S MANUAL FOR

MACHINE GUN, 7.62MM, M240 (1005-01-025-8095);

M240B (1005-01-412-3129); M240C (1005-01-085-4758)

M240D (1005-01-418-6995); M240E1 (1005-01-252-4288)

M240G (1005-01-359-2714); M240N (1005-01-493-1666)

DISTRIBUTION STATEMENT C: Distribution authorized to U.S. Government

agencies and their contractors. This publication is required for administration

and operational purposes, as determined 9 Jan 1989. Other request for this

document shall be referred to: Tank-automotive and Armaments Command,

1 Rock Island Arsenal, Rock Island, IL 61299-7630.

HEADQUARTERS, DEPARTMENTS OF THE ARMY,

AIR FORCE, MARINE CORPS AND NAVY

NOVEMBER 2002

WARNING SUMMARY

Observe all the warnings in this manual. They can save your life.

Be sure to clear weapon before disassembling, cleaning, inspecting, transporting,

or storing.

Ensure that assigned/spare barrels have been headspaced and tagged to your

receiver. Rotate usage of the barrels.

Do not interchange barrel assembly or bolt assembly from one machine gun to

another without being headspaced/gaged. Doing so may result in injury to, or

death of, personnel.

Never reload a runaway weapon until it is repaired. Be sure weapon is cleared

before removing it from vehicle/tripod mount.

Before firing, make sure the barrel is locked tightly in the receiver. If the barrel is

not locked, threads in receiver could be damaged or cause personal injury.

A hot barrel can burn you. If the barrel is hot, use your heat resistant mitten.

a

WARNING SUMMARY (cont)

Using gasoline, kerosene, hydraulic oil, benzene, bensol, high-pressure water,

steam, or air for cleaning is prohibited.

If nothing is ejected and you have a hot gun (200 rounds fired within a 2 minute

period), do NOT open the cover. Place safety to “S” safe, keep weapon pointed

down range, and remain away from the weapon for 15 minutes. After 15

minutes, clear your weapon (WP 0010 00).

The climate temperature in different regions will make a difference as to what

constitutes a hot gun. A hot, sunny day can cause a cook-off within 50 rounds,

weapon and ammunition in the sun.

If runaway occurs, always keep machine gun pointed down range.

Always keep weapon pointed down range.

Appropriate eye protection is recommended when cleaning your weapon and/or

its parts.

Use care when removing excess carbon, carbon may chip off and fly into eyes.

b

Cleaning solvent is FLAMMABLE and TOXIC and must be kept away from open

flames and used in a well-ventilated area. Use of rubber gloves is necessary to

protect the skin when washing machine gun parts.

The canvas cover above the driver and passenger seats should always be in

place when firing.

Firing on the move is not permitted from the M998 HMMWV (Cargo/Troop

Carrier).

Ground personnel should not be within 10 meters of any vehicle when firing.

All personnel within 20 meters of a weapon firing, shall wear approved single

hearing protection devices during training exercises.

This is the only ammunition authorized for use in your machine gun. If it is not

shown, it is not authorized.

Ammunition which fails to fire will be disposed of by authorized procedures.

Stay clear of muzzle. Do not allow round to hit any hard surface or it may fire.

Dispose of live round(s) in accordance with local procedures.

c

WARNING SUMMARY (cont)

First aid

For further information on first aid, see FM 21-11.

d

LIST OF EFFECTIVE PAGES

NOTE: The portion affected by this revision are indicated by a vertical line in the

outer margin of the page.

Dates of issue for original and change pages are:

Original 0 15 Nov 2002

Page thru Page Change

No. Page thru Page Change

No.

a-d 0 0010 00-1 thru –4 0

A-B 0 0011 00-1 thru –2 0

i-viii 0 0012 00-1 thru -2 0

0001 00-1 thru -6 0 0013 00-1 thru –2 0

0002 00-1 thru –2 0 0014 00-1 thru –2 0

0003 00-1 thru –2 0 0015 00-1 thru –2 0

0004 00-1 thru –2 0 0016 00-1 thru –4 0

0005 00-1 thru –2 0 0017 00-1 thru –2 0

0006 00-1 thru –2 0 0018 00-1 thru –2 0

0007 00-1 thru –14 0 0019 00-1 thru –18 0

0008 00-1 thru –2 0 0020 00-1 thru –14 0

0009 00-1 thru –4 0 0021 00-1 thru –6 0

A

LIST OF EFFECTIVE PAGES (cont)

List of Effective Pages (cont)

Page thru Page Change

No. Page thru Page Change

No.

0022 00-1 thru –26 0 0038 00-1 thru –6 0

0023 00-1 thru –6 0 0039 00-1 thru -6 0

0024 00-1 thru -2 0 0040 00-1 thru -6 0

0025 00-1 thru –4 0 Cover 0

0026 00-1 thru –6 0

0027 00-1 thru –2 0

0028 00-1 thru –4 0

0029 00-1 thru -4 0

0030 00-1 thru –4 0

0031 00-1 thru –2 0

0032 00-1 thru –6 0

0033 00-1 thru –2 0

0034 00-1 thru –18 0

0035 00-1 thru –2 0

0036 00-1 thru -4 0

0037 00-1 thru –16 0

B

ARMY TM 9-10050313-10

AIR FORCE T.O. 11W2-6-5-1

MARINE CORPS TM 08670A/09712A-10/1B

NAVY SW360-AH-OMI-010

TECHNICAL MANUAL

ARMY NO. 9-1005-313-10

AIR FORCE NO. 11W2-6-5-1

MARINE CORPS NO. 08670A-10/2B

NAVY NO. SW360-AH-OMI-010

HEADQUARTERS

DEPARTMENTS OF THE ARMY

AIR FORCE, MARINE CORPS,

AND NAVY

Washington, D.C., 15 November 2002

Operator's Manual

MACHINE GUN, 7.62MM, M240 (1005-01-025-8095)

MACHINE GUN, 7.62MM, M240B (1005-01-412-3129)

MACHINE GUN, 7.62MM, M240C (1005-01-085-4758)

MACHINE GUN, 7.62MM, M240D (1005-01-418-6995)

MACHINE GUN, 7.62MM, M240E1 (1005-01-252-4288)

MACHINE GUN, 7.62MM, M240G (1005-01-359-2714)

MACHINE GUN, 7.62MM, M240N (1005-01-493-1666)

* This manual supersedes TM 9-1005-313-10, dated 19 July 1996, with all

changes, and Marine Corps TM 08670B-10/1A, Supplement 1, dated 29 July

1994.

i

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes or if you know of any

way to improve the procedures, please let us know. Submit your DA Form 2028

(Recommended Changes to Equipment Technical Publications), through the

Internet, on the Army Electronic Product Support (AEPS) website. The internet

address is http://aeps.ria.army.mil. If you need a password, scroll down and click

on “ACCESS REQUEST FORM”. The DA 2028 form is located in the ONLINE

FORMS PROCESSING section of the AEPS. Fill out the form and click on

SUBMIT. Using this form on the AEPS will enable us to respond quicker to your

comments and better manage to DA Form 2028 program. You may also mail,

fax, or E-mail your letter or DA Form 2028 direct to: AMSTA-LC-CI/TECH PUBS,

TACOM-RI, 1 Rock Island Arsenal, Rock Island, IL 61299-7630. The email

address is TACOM-TECH-PUBS@ria.army.mil. The fax number is DSN 793-

0726 or commercial (309) 782-0726. Marine Corps users submit NAVMC Form

10772 via Marine Corps Publications website at: http://pubs.ala.usmc.mil . Air

Force requests for this document shall be referred to WR-ALC/LKC, Robins AFB,

GA 31098-1640. Navy users submit Recommended Changes to Publications to

Commander, Naval Surface Warfare Center, Crane Division, Code 4081, Crane,

IN 47522-5001. A reply will be furnished to you.

ii

DISTRIBUTION STATEMENT C: Distribution authorized to U.S. Government

Agencies and their contractors. This publication is required for administration and

operational purposes, as determined 9 Jan 1989. Other requests for this

document shall be referred to Tank-automotive and Armaments Command,

ATTN: AMSTA-LC-CIP-WT, 1 Rock Island Arsenal, Rock Island, IL 61299-7630.

iii

This page intentionally left blank.

iv

TABLE OF CONTENTS

Page

WARNING SUMMARY.......................................................................a

LIST OF EFFECTIVE PAGES ...........................................................A

HOW TO USE THIS MANUAL...........................................................vii

CHAPTER 1 GENERAL INFORMATION, DESCRIPTION, AND

THEORY OF OPERATION

General Information........................................................................WP 0001 00-1

Scope................................................................................................WP 0001 00-4

Maintenance Forms, Records and Reports ................................WP 0002 00-1

Reporting Equipment Improvement Recommendations...........WP 0003 00-1

Corrosion Prevention and Control................................................WP 0004 00-1

Destruction of Material to Prevent Enemy Use..........................WP 0005 00-1

Preparation for Storage and Shipment........................................WP 0006 00-1

Equipment Description and Data..................................................WP 0007 00-1

v

TABLE OF CONTENTS (cont)

Page

CHAPTER 2 OPERATING INSTRUCTIONS

Technical Principles of Operation.................................................WP 0008 00-1

Operation Under Usual Conditions ..............................................WP 0009 00-1

Loading........................................................................................WP 0009 00-1

Clearing.......................................................................................WP 0010 00-1

Bipod Operation (M240B/M240G)).........................................WP 0011 00-1

Definitions ...................................................................................WP 0012 00-1

Immediate Action.......................................................................WP 0013 00-1

Remedial Action.........................................................................WP 0014 00-1

Runaway Machine Gun ............................................................WP 0015 00-1

Stuck Cartridge Case or Live Round......................................WP 0016 00-1

Ruptured Cartridge Case..........................................................WP 0017 00-1

Operation Under Unusual Conditions ...............................................WP 0018 00-1

CHAPTER 3 TROUBLESHOOTING PROCEDURES

General........................................................................................WP 0019 00-1

Fails to fire on initial burst.........................................................WP 0019 00-2

Failure to feed............................................................................WP 0019 00-4

Weapon stops firing...................................................................WP 0019 00-6

vi

Page

CHAPTER 3 TROUBLESHOOTING PROCEDURES (cont)

Sluggish operation.....................................................................WP 0019 00-9

Fails to chamber........................................................................WP 0019 00-10

Fails to fire ..................................................................................WP 0019 00-13

Failure to extract ........................................................................WP 0019 00-14

Failure to eject............................................................................WP 0019 00-15

Failure to cock or runaway gun...............................................WP 0019 00-17

CHAPTER 4 MAINTENANCE PROCEDURES

Preventive Maintenance Checks and Services..........................WP 0020 00-1

Field Strip.........................................................................................WP 0021 00-1

Cleaning, Inspection, and Repair.................................................WP 0022 00-1

Reassembly.....................................................................................WP 0023 00-1

Safety/Function Check...................................................................WP 0024 00-1

Lubrication Instructions ..................................................................WP 0025 00-1

Adjustment of Sights.......................................................................WP 0026 00-1

Associated Equipment....................................................................WP 0027 00-1

Mounting T&E Mechanism and

Pintle Assembly to Tripod (M122A1) ......................................WP 0028 00-1

Mounting Weapon on M122A1 Tripod Assembly......................WP 0029 00-1

vii

TABLE OF CONTENTS

CHAPTER 4 MAINTENANCE PROCEDURES (cont)

Mounting T&E Mechanism and

Flexible Mount Assembly to Tripod.........................................WP 0030 00-1

Mounting Weapon on Flexible Mount Assembly on Tripod......WP 0031 00-1

Mounting Weapon on M6 Pedestal Mount and

M197 Machine Gun Mount.......................................................WP 0032 00-1

Attachment of Ammunition Adapter Assembly (M240B) ..........WP 0033 00-1

M24 Blank Firing Adapter and

M21 Blank Firing Attachment...................................................WP 0034 00-1

Emergency Ergess Package (M240D Only) ..................................WP 0035 00-1

CHAPTER 5 AMMUNITION .........................................................WP 0036 00-1

CHAPTER 6 SUPPORTING INFORMATION

References .......................................................................................WP 0037 00-1

Components of End Item and Basic Issue Items Lists.............WP 0038 00-1

Additional Authorized List and Additional Equipment List........WP 0039 00-1

Expendable/Durable Supplies and Materials List......................WP 0040 00-1

viii

HOW TO USE THIS MANUAL

In order to use this manual, there are several things you need to know.

1) All references in the manual are to work packages or to another

manual.

2) Procedures apply to all models unless otherwise specified.

This manual is organized to help you quickly find the information you need.

1) Table of Contents: List in order all chapters and work package

references.

2) Component of End Item (COEI): List of items that are part of the end

item, but are shipped separately. It is not an authorization to

requisition replacements.

3) Basic Issue Items (BII): List of minimum essential items required when

weapon is in operation, and to perform emergency repairs. This

manual is you authorization to request/replace BII.

ix/x blank

CHAPTER 1

GENERAL INFORMATION,

DESCRIPTION AND

THEORY OF OPERATION

GENERAL INFORMATION 0001 00

2AN0001

M240

2AN0002

M240C

0001 00-1

GENERAL INFORMATION (cont) 0001 00

2AN0003

M240D

2AN0004

M240E1

0001 00-2

M240B

2AN0006

M240G

2AN0007

M240N

0001 00-3

GENERAL INFORMATION (cont) 0001 00

SCOPE

Type of Manual: Operator’s Manual.

Model Number and Equipment Name:

M240, 7.62mm, Machine Gun

M240B, 7.62mm, Machine Gun

M240C, 7.62mm, Machine Gun

M240D, 7.62mm, Machine Gun

M240E1, 7.62mm, Machine Gun

M240G, 7.62mm, Machine Gun

M240N, 7.62mm, Machine Gun

Purpose of Equipment:

M240/M240C – Designed as coaxial machine gun for tanks and 7.62mm fire power on light

armored vehicles.

M240B/M240G – Designed as a tripod mounted or bipod supported machine gun for use by

ground forces. The bipod is integrated into the receiver assembly of the weapon.

0001 00-4

M240E1 - Designed with front and rear sights, uses 7.62mm ammunition, and

spade grip trigger device and is pintle mounted on light armored vehicles.

M240D - Designed with front and rear sights, uses 7.62mm ammunition, and

spade grip trigger and is mounted in helicopter applications.

M240N– Designed with front and rear sights, and configured for mounting on

water craft.

0001 00-5/6 blank

MAINTENANCE FORMS, RECORDS, AND REPORTS 0002 00

Department of the Army forms and procedures used for equipment maintenance

will be those prescribed by DA PAM 738-750, The Army Maintenance

Management System (TAMMS).

Marine Corps users refer to TM 4700-15/1, Ground Equipment Record

Procedures.

0002 00-1/2 blank

REPORTING EQUIPMENT IMPROVEMENT

RECOMMENDATIONS (EIR) 0003 00

If your machine gun needs improvement, let us know. Send us an EIR. You, the

user, are the only one who can tell use what you don’t like about your equipment.

Let us know why you don’t like the design or performance. Put it on an SF 368

(Product Quality Deficiency Report). Mail to the address specified in DA PAM

738-750, Functional users Manual for the Army Maintenance Management

System (TAMMS), or as specified by the acquiring activity. We will send you a

reply.

Army users submit an SF 368 (QDR) and mail to: Commander, U.S. Army

Armament Research Development and Engineering Center, ATTN: AMSTA-AR-

QAW-A, 1 Rock Island Arsenal, Rock Island, IL 61299-7630.

Marine Corps users submit QDR’s or SF 368 in accordance with MCO 4855.10 to:

Commanding General, Marine Corps Logistics Base (Code 808), Albany, GA

31704-5000.

Navy users submit Quality Deficiency Report to Commander, Naval Surface

Warfare Center, Crane Division, Code 4081, Crane, IN 47522-5001.

We’ll send you a reply.

0003 00-1/2 blank

CORROSION PREVENTION AND CONTROL 0004 00

Corrosion Prevention and Control (CPC) of Army materiel is a continuing concern.

It is important that any corrosion problems with this item be reported so that the

problem can be corrected and improvements can be made to prevent the problem

in the future.

While corrosion is typically associated with rusting of metals, it can also include

deterioration of other materials, such as rubber and plastic. Unusual cracking,

softening, swelling, or breaking of these materials may be a corrosion problem.

If a corrosion problem is identified, it can be reported using SF 368, Product

Quality Deficiency Report. Use key words such as “corrosion”, rust”,

deterioration”, or cracking” will ensure that the information is identified as a CPC

problem.

The form should be submitted to the address specified in DA PAM 738-750,

Functional Users Manual for the Army Maintenance Management System

(TAMMS).

0004 00-1

CORROSION PREVENTION AND CONTROL (cont) 0004 00

Marine Corps users: The prevention of corrosion on any equipment is important

and is critically important for safe functioning of your machine gun. Corrosion

prevention is carried out in accordance with TM 3080-12 (Corrosion Prevention

and Control for Marine Corps Equipment). If a recurrent corrosion problem is

identified, it should be reported on SF 368 (Product Quality Deficiency Report) in

accordance with guidance contained in MCO 4855.10 (Product Quality Deficiency

Report).

Navy users submit Product Quality Deficiency Report or Material Deficiency

Report (MDR) to Commander, Naval Surface Warfare Center, Crane Division,

Code 4081, Crane, IN 47522-5001.

0004 00-2

DESTRUCTION OF ARMY MATERIEL

TO PREVENT ENEMY USE 0005 00

Procedures and materials used for the destruction of the machine gun to prevent

enemy use will be found in TM 750-244-7.

Marine Corps users render the M240 inoperable by smashing, schattering, and

concealing disassembled pieces.

0005 00-1/2 blank

PREPARATION FOR STORAGE OR SHIPMENT 0006 00

Storage and shipment shall be in accordance with local procedures and AR 190-11,

Physical Security of Arms, Ammunition and Explosives.

0006 00-1/2 blank

EQUIPMENT DESCRIPTION AND DATA 0007 00

EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES

Equipment Characteristics:

M240/M240C – Designed as coaxial machine gun for tanks and 7.62mm fire

power on light armored vehicles.

M240B/M240G – Designed as a tripod mounted or bipod supported machine gun

for use by ground forces. The bipod is integrated into the receiver assembly of

the weapon.

M240E1 - Designed with front and rear sights, uses 7.62mm ammunition, and

spade grip trigger device and is pintle mounted on light armored vehicles.

M240D - Designed with front and rear sights, uses 7.62mm ammunition, and

spade grip trigger and is mounted in helicopter applications.

M240N– Designed with front and rear sights, and configured for mounting on

water craft.

0007 00-1

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (cont)

Capabilities and Features:

The M240 Series Machine Gun is gas -operated and fires from the open bolt

position. The 7.62mm is the authorized round for the machine gun (WP 0035

00).

The M240B has a buttstock and hydraulic buffer assembly and can be mounted

on the M122A1 tripod (refer to TM 9-1005-245-13&P).

The M240G has a buttstock and buffer assembly and can be mounted on the

M122 tripod with a flexible mount (refer to TM 9-1005-245-13&P) (Marine Corps

only).

0007 00-2

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

Barrel Assembly (A) – Houses cartridge for firing and directs projectile.

Buffer Assembly/Buffer and Spade Grip Assembly/Buttstock and Buffer

Assembly (B) – Absorbs recoil for bolt and operating rod assembly at the end of

recoil movement.

Driving Spring Rod Assembly (C) - Provides energy for returning bolt and

operating rod assembly to firing position.

Bolt and Operating Rod Assembly (D) – Provides feeding, striping,

chambering, firing, extraction, and ejection of cartridges using the projectile

propelling gases for power.

Trigger Housing Assembly (E) – Controls the firing of the machine gun.

Cover Assembly (F) - Feeds linked belt, positions and holds cartridges in

position for stripping, feeding and chambering. Cover has integral sight mounting

rail for current/future accessories (all models except M240/M240C).

Feed Tray (G) – Serves as a guide for positioning cartridges to assist in

chambering.

0007 00-3

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)

Receiver Assembly (H) – Serves as a support of all major components. The

receiver houses action of weapon, and controls functioning of weapon through a

series of cam ways. Receiver has a forward integral mounting rail for

current/future accessories (M240B only).

M240C

A

B

C

D

E

F

G

H

2AN0008

F

G

M240/M240C

0007 00-4

2AN0009

A

B

C

D

E

F

G

H

M240B

0007 00-5

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)

A

C

D

F

G

H

B

E

2AN0010

M240D

0007 00-6

A

B

C

D

E

F

G

H

2AN0011

M240E1

0007 00-7

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)

A

B

C

D

E

F

G

2AN0012

H

M240G

0007 00-8

A

B

C

D

E

F

G

2AN0013

H

M240N

0007 00-9

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

DIFFERENCES BETWEEN MODELS

M240

M240B

M240C

M240D M240E1

M240G M240N

Feeds from right X

Feeds from left X X X X X X

Cover Assy:

PN 11826165

PN 11826038

PN 12977101

X

Receiver Assy:

PN 11826192

PN 12597044

PN 12976834

PN 12997566

PN 12999179

PN 12977104

X

0007 00-10

M240

M240B

M240C

M240D M240E1

M240G M240N

Barrel Assy:

PN 11825985

PN 12597035

PN 12976817

PN 12976818

X

Trigger Assy:

PN 11826230

PN 12597070

PN 12977118

PN 12976869

X

Buffer Assy

PN 11826211

X

Buffer and

Spade Grip

Assy:

PN 12597057

X

Buttstock and

Buffer Assy:

PN 12976851

X

0007 00-11

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

DIFFERENCES BETWEEN MODELS (cont)

M240

M240B

M240C

M240D M240E1

M240G M240N

Buttstock and

Buffer Assy

(Hydraulic):

PN 12988986

X

Charger Cable

PN 11826145

X

Cocking Handle

Assy:

PN 12597045

PN 12976835

PN 12977105

X

Procedures are written for the M240 machine gun but apply to all seven models,

except where noted.

Do not mix and match parts for one model configuration to another model.

0007 00-12

EQUIPMENT DATA

Weight.............10.34 Kg (22.2 lbs) (M240/M240C); 12.29 Kg (27.1 lbs) (M240B);

10.39 Kg (22.9 lbs) (M240D); 11.66 Kg (25.7 lbs) (M240E1);

11.7 Kg (25.8 lbs) (M240G); 10.93 Kg (24.1 lbs) (M240N)

Rate of Fire ....You get the sustained and rapid rates through practice.

Cyclic...............650 to 950 RDS/M – Weapon is not intended to fire at 950 RDS/M.

This will cause accelerated wear/damage to the barrel and rest of

weapon.

600 to 650 RDS/M – M240B/M240N with hydraulic buffer.

Sustained........100 RDS/M (4-5 seconds between burst) – Change barrel every

10 minutes.

Rapid...............200 RDS/M (2-3 seconds between burst) – Change barrel every 2

minutes.

NOTE

Barrel change intervals also apply when firing blank ammunition.

0007 00-13

EQUIPMENT DESCRIPTION AND DATA (cont) 0007 00

EQUIPMENT DATA (cont)

Range:

Maximum.....................................3,725 meters

Maximum

effective (point)...........................800 meters with M122A1 Tripod (M240B)

(M122 Tripod with Flex Mount Assembly

(M240G) (Marine Corps only)).

Maximum

Effective (area)...........................1,800 meters with M122A1 Tripod (M240B)

(M122 Tripod with Flex Mount Assembly

(M240G) (Marine Corps only)).

Tracer burnout............................Approximately 900 meters.

0007 00-14

CHAPTER 2

OPERATING INSTRUCTIONS

TECHNICAL PRINCIPLES OF OPERATION 0008 00

FACTS ABOUT YOUR MACHINE GUN

The barrel is air-cooled and has an established headspace allowing quick

changes for cooling and maintenance when required. The rate of fire is

controlled by 3 regulator settings (setting #1 is preferred). Settings #2 and #3 are

used when carbon build-up, cold weather, or dusty conditions reduce the firing

rate. Bolt design permits the cover to be opened or closed, regardless of the bolt

position, without damage.

NOTE

This design is intended to maintain a consistent rate of fire

under adverse conditions and is not to increase the rate of fire.

Gas inlet setting #1 is the preferred setting for normal

conditions. If gas regulator plug has been set to setting #2 or

#3 to increase firing rate, take corrective action to return to

primary setting #1 as soon as possible.

Gas regulator may need to be changed to setting #2 for firing

blank ammunition. After cleaning, return to Setting #1 for

firing of standard ammunition.

0008 00-1

TECHNICAL PRINCIPLES OF OPERATION 0008 00

FACTS ABOUT YOUR MACHINE GUN

2AN0014

Setting #1 = 650 RDS/M approx. (600 RD/S – M240B/M240N with hydraulic buffer)

Setting #2 = 750 RDS/M approx. (625 RD/S – M240B/M240N with hydraulic buffer)

Setting #3 = 950 RDS/M approx. (650 RD/S – M240B/M240N with hydraulic buffer)

0008 00-2

OPERATION UNDER USUAL CONDITIONS –

LOADING 0009 00

S

2AN0015

ALL MODELS EXCEPT

M240/M240C

WARNING

Under no circumstances should the safety be engaged with the

bolt in the forward position.

Place safety to “F” fire.

Pull charger cable (or cocking handle assembly) to rear, and ensure bolt locks to

rear. Release charger cable (or return cocking handle assembly) to fully forward

and locked position.

0009 00-1

OPERATION UNDER USUAL CONDITIONS –

LOADING (cont) 0009 00

2AN0016

FEED TRAY

Place safety to “S” safe.

Push in latches to open cover assembly. Remove any ammunition if present.

Raise feed tray. Look into chamber, make sure no round is chambered and area is

free of obstructions. Lower feed tray.

Place safety to “F” fire.

Pull and hold charger cable (or cocking handle assembly) to rear, squeeze trigger

and ease bolt forward to close and lock.

0009 00-2

ALL MODELS

EXCEPT M240C M240C

2AN0017

NOTE

Position open side of links down.

Place link belt in feed tray with first round positioned against cartridge stop.

CAUTION

Make sure round does not move away from cartridge stop during

closing and latching of cover.

Close cover assembly. Make sure it locks shut. (Air Force users, this is HALF-

LOAD and is an authorized carry/transportation configuration of the M240B and

it’s ammo.)

0009 00-3

OPERATION UNDER USUAL CONDITIONS –

LOADING (cont) 0009 00

Pull charger cable (or cocking handle assembly) to rear, and ensure bolt locks to

rear. Release charger cable (or return cocking handle assembly) to fully forward

and locked position.

If weapon is not to be fired immediately, place safety to “S” safe. Place safety to

“F” fire immediately prior to firing. (Air Force users, this is FULL-LOAD/

COMBAT LOAD configuration.)

NOTE

Proper trigger control is pulling the trigger fully to the rear and

then releasing completely. Squeezing the trigger can cause

accelerated wear on the trigger tripping lever, sear and

operating rod, leading to a run-away gun.

0009 00-4

OPERATION UNDER USUAL CONDITIONS –

CLEARING 0010 00

S

2AN0015

ALL MODELS EXCEPT

M240/M240C

Place safety to “F” fire.

Pull charger cable (or cocking handle assembly) to rear, and release. Ensure

cocking handle assembly is in fully forward and locked pos ition.

Place safety to “S” safe.

0010 00-1

OPERATION UNDER USUAL CONDITIONS –

CLEARING 0010 00

ALL MODELS

EXCEPT M240C 2AN0018

COVER

LATCH

M240C

COVER

LATCH

AMMO

BELT

Push in latches to open cover assembly.

Remove ammunition belt.

0010 00-2

OPERATION UNDER USUAL CONDITIONS –

CLEARING (cont) 0010 00

2AN0019

FEED TRAY

CHAMBER

Raise feed tray. Look into chamber to make sure it is empty. If a round is still in

the chamber, refer to ruptured/stuck cartridge case or live round procedures

(WP 0016 00 and WP 0017 00).

Lower feed tray.

0010 00-3

OPERATION UNDER USUAL CONDITIONS –

CLEARING (cont) 0010 00

S

2AN0015

ALL MODELS EXCEPT

M240/M240C

Place safety to “F” fire.

Pull and hold charger cable (or cocking handle assembly) to rear, pull trigger and

ease bolt forward to close and lock.

Close cover assembly. Make sure it locks shut.

NOTE

Be sure bolt is forward with safety in “F” fire when gun is not in use.

0010 00-4

OPERATION UNDER USUAL CONDITIONS –

OPERATION OF BIPOD 0011 00

BIPOD RETAINING

LATCH

BIPOD LEGS

2AN0021

To operate the weapon from the bipod (M240B/M240G):

Depress the bipod retaining latch, while holding the bipod legs together to

disengage them from the receiver

Rotate the bipod legs down and release them so they lock in the vertical position.

0011 00-1

OPERATION UNDER USUAL CONDITIONS –

OPERATION OF BIPOD (cont) 0011 00

BIPOD RETAINING

LATCH

BIPOD LEGS

2AN0021

To return the bipod to locked upright position:

Hold the bipod legs together to disengage them from the locked vertical position.

Rotate legs rearward, depress the bipod latch and engage the bipod leg hooks

into the slots of receiver. Release the bipod retaining latch to its original position,

locking the legs into position.

0011 00-2

OPERATION UNDER USUAL CONDITIONS –

DEFINITIONS 0012 00

STOPPAGE – Any interruption in the cycle of operation of the gun.

IMMEDIATE ACTION – Prompt actions taken by the crew to overcome a

stoppage.

REMEDIAL ACTION - Action taken to identify stoppage, if immediate action fails.

COOK-OFF – This is a peacetime classification only. The gun will be classed as

a hot or cold gun in the interest of safety.

CLASSIFICATION OF HOT GUN

• More than 200 rounds fired within a 2 minute period.

• A long continuous burst or repeated firing of the weapon even though

you do not reach 200 rounds.

• Less than 15 minutes have lapsed with out a round being fired from a hot

gun.

• If the vehicle Commander for any reason determines the weapon is hot.

0012 00-1/2 blank

OPERATION UNDER USUAL CONDITIONS –

IMMEDIATE ACTION 0013 00

WARNING

If nothing is ejected and you have a hot gun (200 rounds fired

within a 2 minute period), do NOT open the cover. Place safety

to “S” safe, keep weapon pointed down range, and remain

away from the weapon for 15 minutes. After 15 minutes, clear

your weapon (WP 0010 00).

The climate temperature in different regions will make a

difference as to what constitutes a hot gun. A hot, sunny day

can cause a cook-off within 50 rounds, weapon and

ammunition in the sun.

0013 00-1

OPERATION UNDER USUAL CONDITIONS –

IMMEDIATE ACTION (cont) 0013 00

Charge the weapon.

Attempt to fire.

If the gun does not fire, pull charger cable (or cocking handle assembly) rearward

to lock bolt assembly back (return cocking handle assembly to forward locked

position), place safety on “S” safe, then:

• If Hot Gun – Keep weapon pointed down range for 15 minutes, then

perform remedial action.

• If Cold Gun – Perform remedial action.

0013 00-2

OPERATION UNDER USUAL CONDITIONS –

REMEDIAL ACTION 0014 00

Clear the weapon (WP 0010 00).

Visually inspect weapon.

Load and attempt to fire.

If weapon does not fire, notify unit maintenance.

0014 00-1/2 blank

OPERATION UNDER USUAL CONDITIONS –

RUNAWAY MACHINE GUN 0015 00

WARNING

Always keep weapon pointed down range.

Never reload a runaway weapon until it is repaired. Be sure

weapon is cleared (WP 0010 00) before removing it from

vehicle/tripod mount.

If runaway occurs (weapon won’t stop firing), take any of the 3 actions below to

stop the runaway. Then notify unit maintenance.

Let weapon fire if near end of link belt.

ALL MODELS EXCEPT

M240/M240C

2AN0022

LINK

BELT

S

SAFETY

0015 00-1

OPERATION UNDER USUAL CONDITIONS –

RUNAWAY MACHINE GUN (cont) 0015 00

Break link belt (grasp link belt and twist it firmly).

Grab charger cable (or cocking handle assembly), pull all the way back and hold.

Place safety to “S” safe and remove ammunition belt.

ALL MODELS EXCEPT

M240/M240C

2AN0022

LINK

BELT

S

SAFETY

0015 00-2

OPERATION UNDER USUAL CONDITIONS –

STUCK CARTRIDGE CASE OR LIVE ROUND 0016 00

WARNING

Stay clear of muzzle. Do not allow round to hit any hard surface

or it may fire. Dispose of live round(s) in accordance with local

procedures.

If weapon fired but didn’t extract, you have a stuck cartridge case. If weapon did

not fire and didn’t extract, you have a stuck live round.

Charge the weapon, and place safety on “S” safe.

ALL MODELS EXCEPT

M240/M240C

2AN0022

LINK

BELT

S

SAFETY

0016 00-1

OPERATION UNDER USUAL CONDITIONS –

STUCK CARTRIDGE CASE OR LIVE ROUND (cont) 0016 00

Push cocking handle assembly to forward locked position (all models except

M240/M240C).

Wait until barrel is cool; remove barrel (WP 0021 00). Remove cartridge case

from chamber of barrel, or pry rim (if case is tight).

RIM

BARREL

CARTRIDGE

CASE

2AN0023

0016 00-2

ALTERNATIVE MEATHOD

Remove swab holder section from cleaning rod and insert cleaning rod through

muzzle end of barrel, gently tap out cartridge.

STUCK

CARTRIDGE

CASE

CLEANING

ROD

2AN0024

Push end of cleaning rod against stuck case. Push cleaning rod to remove case

with weapon in mounted position.

CLEANING

ROD

STUCK

CARTRIDGE

CASE

BARREL

2AN0025

0016 00-3/4 blank

OPERATION UNDER USUAL CONDITIONS –

RUPTURED CARTRIDGE CASE 0017 00

WARNING

Stay clear of muzzle. Do not allow round to hit any hard surface

or it may fire. Dispose of live round(s) in accordance with local

procedures.

Charge the weapon, and place safety on “S” safe.

Push cocking handle assembly to forward locked position (all models except

M240/M240C).

Wait until barrel is cool; remove barrel (WP 0021 00).

0017 00-1

OPERATION UNDER USUAL CONDITIONS –

RUPTURED CARTRIDGE CASE (cont) 001700

NOTE

In the event a live round is fed into a ruptured case, remove live

round first (WP 0016 00), then remove ruptured cartridge case.

Push threaded end of extractor post through ruptured case. Pull on handle to

remove case.

2AN0026

RUPTURED

CARTRIDGE

CASE

BARREL EXTRACTOR

0017 00-2

OPERATION UNDER UNUSUAL CONDITIONS – 0018 00

Under unusual conditions, clean and lubricate weapon more often.

HOT, DUSTY, AND SANDY AREAS. Clean often. Wipe oil from exposed

surfaces with clean wiping rag (item 7, WP 0040 00). Cover weapon as much as

possible to keep dust and sand out of parts.

HOT, WET CLIMATE. Inspect often. Dry, clean, and lubricate lightly as

necessary.

EXTREMELY COLD CLIMATE. Keep free of moisture. Lightly oil with LAW

(item 4, WP 0040 00).

AFTER EXPOSURE TO WATER. Disassemble, clean, oil and reassemble as

soon as possible. Make sure it’s dry.

NUCLEAR, BIOLOGICAL, AND CHEMICAL (NBC) ESCONTAMINATION.

Decontamination procedures can be found in FM-3-5.

NOTE

Refer to WP 0025 00 for lubrication instructions.

0018 00-1/2 blank

CHAPTER 3

TROUBLESHOOTING PROCEDURES

TROUBLESHOOTING PROCEDURES 0019 00

GENERAL

This table lists the common malfunctions that you may find during the operation

or maintenance of the machine gun or its components. You should perform the

tests/inspections and corrective actions in the order listed.

This manual cannot list all the malfunctions that may occur, nor all tests or

inspections and corrective actions. If a malfunction is not listed or is not

corrected by listed corrective actions, notify unit maintenance.

NOTE

Troubleshooting procedures are written for one machine gun

but apply to all models.

0019 00-1

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures

SYMPTOM

Fails to fire on initial burst.

MALFUNCTION

Weapon not properly charged.

CORRECTIVE ACTION

Charge the weapon.

Safety is still in “S” safe position.

CORRECTIVE ACTION

Move safety to “F” fire.

SAFETY

2AN0027

0019 00-2

MALFUNCTION

Lick belt is not properly loaded.

CORRECTIVE ACTION

Remove and reinstall lick belt properly (WP 0009 00).

2AN0028

LINK BELT

Ammunition is defective.

CORRECTIVE ACTION

Eject round.

0019 00-3

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM

Failure to feed.

MALFUNCTION

Improper lubrication.

CORRECTIVE ACTION

Lube as required (WP 0025 00).

Ammunition or links are defective.

CORRECTIVE ACTION

Remove defective ammunition/links. Install new ammunition/links.

Obstruction in receiver.

CORRECTIVE ACTION

Remove obstruction.

0019 00-4

MALFUNCTION

Rounds in link belt misaligned or link belt inverted.

CORRECTIVE ACTION

Align round in link belt; reinstall link belt properly (WP 0009 00).

2AN0028

LINK BELT

Cover is unlatched.

CORRECTIVE ACTION

Latch cover.

0019 00-5

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Failure to feed.

MALFUNCTION

Cover assembly is damaged, or has weak, worn or missing parts.

CORRECTIVE ACTION

Notify unit maintenance.

SYMPTOM

Weapon stops firing.

MALFUNCTION

Round in chamber is defective.

CORRECTIVE ACTION

Eject round.

RIM

BARREL

CARTRIDGE

CASE

2AN0029

0019 00-6

MALFUNCTION (cont)

Bolt assembly is not fully forward and locked.

CORRECTIVE ACTION

Remove obstructions; or clean (WP 0022 00) and lubricate (WP 0025

00) as required.

UNLOCKED LOCKED

BOLT ASSEMBLY BOLT ASSEMBLY

2AN0030

0019 00-7

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Weapon stops firing.

MALFUNCTION (cont)

Unfired round with dented primer.

CORRECTIVE ACTION

Eject round. Notify unit maintenance.

Feed mechanism is sticking.

CORRECTIVE ACTION

Clean (WP 0022 00) and lubricate (WP 0025 00) feed mechanism. If

problem still exist, notify unit maintenance.

Short recoil.

CORRECTIVE ACTION

Clean (WP 0022 00) and lubricate (WP 0025 00) bolt and operating

rod assembly. If problem still exist, notify unit maintenance.

0019 00-8

SYMPTOM

Sluggish operation.

MALFUNCTION

Receiver is dirty.

CORRECTIVE ACTION

Clean (WP 0022 00) and lubricate (WP 0025 00).

Insufficient lubrication.

CORRECTIVE ACTION

Lubricate (WP 0025 00).

0019 00-9

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM

Failure to chamber.

MALFUNCTION

Stuck or ruptured cartridge case.

CORRECTIVE ACTION

Remove cartridge (WP 0016 00/WP 0017 00).

CARTRIDGE

CASE

2AN0031

Ammunition is dirty.

CORRECTIVE ACTION

Wipe ammunition off with a clean, dry rag (item 7, WP 0040 00).

0019 00-10

MALFUNCTION (cont)

Carbon build-up in receiver.

CORRECTIVE ACTION

Clean receiver as necessary (WP 0022 00).

Round is damaged.

CORRECTIVE ACTION

Remove round and recharge weapon.

Driving spring is damaged or weak.

CORRECTIVE ACTION

If two or more strands broken on the same coil, or three of more

strands are broken in any location, notify unit maintenance.

DRIVING SPRING

2AN0032

0019 00-11

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Failure to chamber.

MALFUNCTION (cont)

Gas plug regulator is damaged.

CORRECTIVE ACTION

Notify unit maintenance.

Dirt in chamber.

CORRECTIVE ACTION

Clean chamber (WP 0022 00).

CHAMBER GAS PLUG

REGULATOR

2AN0033

0019 00-12

SYMPTOM

Failure to fire.

MALFUNCTION

Ammunition is faulty.

CORRECTIVE ACTION

Replace ammunition.

Broken or damaged firing pin.

CORRECTIVE ACTION

Notify unit maintenance.

Driving spring is damaged or weak.

CORRECTIVE ACTION

If two or more strands broken on the same coil, or three of more

strands are broken in any location, notify unit maintenance.

DRIVING SPRING

2AN0032

0019 00-13

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Failure to extract.

MALFUNCTION (cont)

Short recoil.

CORRECTIVE ACTION

Notify unit maintenance.

Damaged extractor/spring.

CORRECTIVE ACTION

Notify unit maintenance.

EXTRACTOR

SPRING

2AN0034

0019 00-14

MALFUNCTION (cont)

Dirty chamber or ammunition.

CORRECTIVE ACTION

Clean chamber (WP 0022 00), wipe ammunition off with clean, dry

rag (item 7, WP 0040 00).

SYMPTOM

Failure to eject.

MALFUNCTION

Short recoil.

CORRECTIVE ACTION

Notify unit maintenance.

Damaged extractor/spring.

CORRECTIVE ACTION

Notify unit maintenance.

EXTRACTOR

SPRING

2AN0034

0019 00-15

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Failure to eject.

MALFUNCTION (cont)

Spent case bag is full.

CORRECTIVE ACTION

Empty bag.

0019 00-16

SYMPTOM

Failure to cock or runaway gun.

MALFUNCTION

Sear is broken, worn or burred.

CORRECTIVE ACTION

Notify unit maintenance.

F

2AN0035

SEAR

0019 00-17

TROUBLESHOOTING PROCEDURES (cont) 0019 00

Table 1. Troubleshooting Procedures (cont).

SYMPTOM (cont)

Failure to cock or runaway gun.

MALFUNCTION (cont)

Operating rod sear notch is worn.

CORRECTIVE ACTION

Notify unit maintenance.

Sear is stuck in housing.

CORRECTIVE ACTION

Notify unit maintenance.

Short recoil.

CORRECTIVE ACTION

Notify unit maintenance.

0019 00-18

CHAPTER 4

MAINTENANCE PROCEDURES

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES 0020 00

Always keep in mind the WARNINGS and CAUTIONS before and during

operation. Be sure to perform your after (A) PMCS.

Perform BEFORE PMCS if:

• You are the assigned operator and the machine gun has been stored

and not used for a period of 90 days.

• You have been issued the machine gun for the first time.

BEFORE (B)- Checks and services performed prior to the equipment leaving its

containment area or performing its intended mission.

DURING (D) – Checks begin when the equipment is being used in its intended

mission.

AFTER (A) – Checks and services begin when the equipment is taken out of its

mission mode or returned to its containment area.

0020 00-1

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Your PMCS table lists inspections and care required to keep your machine gun in

good operating condition.

The interval column tells you when and the procedure column tells you how to do

a certain check or service. The equipment condition listed in “NOT FULLY

MISSION CAPABABLE IF” column indicates problems which must be corrected

before you can operate the machine gun. The terms “ready/available” and

“mission capable” refer to the same status: equipment is on hand and is able to

perform its combat missions (see DA PAM 738-750).

If your machine gun does not perform as required, refer to Troubleshooting (WP

0019 00) for possible malfunctions and corrective actions. Report malfunctions

on proper DA Form 2404 or refer to DA PAM 738-750.

0020 00-2

Table 1. Preventive Maintenance Checks and Services

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

WARNING

Be sure to clear weapon before disassembling, clearing,

inspecting, transporting, or storing.

Do not interchange barrel assembly or bolt assembly from one

machine gun to another without being headspaced/gaged.

Doing so may result in injury to, or death of, personnel.

Ensure that assigned/spare barrels have been headspaced and

tagged to your receiver. Rotate usage of the barrels as

specified in WP 0007 00.

NOTE

Barrel changes are required with all types of authorized

ammunition, to include blanks.

0020 00-3

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Table 1. Preventive Maintenance Checks and Services (cont)

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

1 B Barrel

Assembly Remove barrel (WP 0021 00) and

check bore and chamber. Using

cleaning rod and swab (item 8, WP

0039 00), remove oil, foreign

material, or obstructions. Install and

lock barrel securely in receiver (WP

0023 00). (Spare barrel must also be

checked and cleaned before use.)

Inspect heat shield for cracks

(M240B).

Obstruction in

barrel cannot be

removed or

barrel will not

lock securely in

receiver (WP

0023 00). Heat

shield missing or

broken so as to

allow contact

with metal

(M240B only).

CHAMBER

2AN0036

SWAB

0020 00-4

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

2 B Buffer

Assembly Make sure back plate latch is locked. Latch will not

hold buffer

assembly in

receiver.

NOTE

Ensure spring pin is in place.

BACK PLATE

LATCH

SPRING PIN

2AN0037

0020 00-5

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Table 1. Preventive Maintenance Checks and Services (cont)

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

NOTE

Do not apply lubricants to composition/rubber components.

3 B Buttstock

and Buffer

Assembly

(M240B/

M240G/

M240N)

Make sure back plate latch is locked.

Externally inspect the buttstock for

cracks. The buttstock may be

cleaned with a brush and soapy

water, rinsed, and wiped dry with a

clean rag.

Latch will not

hold buttstock

assembly in

receiver.

Buttstock is

cracked.

LATCH

BUTTSTOCK AND

BUFFER ASSEMBLY

2AN0038

0020 00-6

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully

Mission capable

if:

3 B Cover

Assembly Squeeze cover latches and raise

cover. Let go of latches and close

cover. Make sure latches hold cover

shut. Inspect accessory mounting

rail for nicks and burrs (all models

except M240/M240C).

Latches fail to

hold cover shut.

Accessory rail

will not accept

optional sighting

devices (all

models except

M240/M240C).

COVER

LATCH

2AN0039

0020 00-7

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Table 1. Preventive Maintenance Checks and Services (cont)

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

NOTE

The charger cable is on the M240/M240C models only. All other models

have a cocking handle assembly.

Weapon should not be on “S” safe without bolt assembly locked fully to

the rear.

4 B Charger

Cable,

Safety,

and Bolt

Assembly

Pull charger cable/cocking handle

assembly to the rear (return and lock

in forward position), make sure bolt

assembly moves freely without

binding and locks to the rear. Place

safety to “S” safe and pull trigger.

Bolt assembly should not move

forward. Place safety to “F” fire.

Keep hold of charger cable and pull

trigger. Let bolt assembly return to

forward position slowly.

0020 00-8

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

TRIGGEER

COCKING

HANDLE

SAFETY

CHARGER

CABLE

TRIGGER

SAFETY

2AN0040

0020 00-9

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Table 1. Preventive Maintenance Checks and Services (cont)

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

5 B/A Receiver

Assembly

(models as

specif ied)

Inspect mounting points (2).

Check barrel locking latch (3) for

spring tension and locking action (all

models). Externally inspect the

appearance and operation of the

bipod (1) (M240B/M240G). Check

the rear sight (4), the slide assembly

catches, and that the elevation

markings are readable (all models

except M240/M240C).

Any parts are

broken, missing,

or damaged to

the extent it

could cause gun

to malfunction.

132

4

2AN0041

5

0020 00-10

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

Check forward rail assembly (5) for

nicks and burrs; movement on

receiver.

Rails will nor

accept optional

devices; rail

assembly moves

on receiver.

NOTE

If gas regulator has to be set to setting #2 or #3 to increase firing rate,

take corrective action and return weapon to primary setting #1 (WP 0008

00).

6 D Machine

Gun (firing

cycle)

Note machine gun firing rate. If firing

cycle slows down, clean and oil

machine gun. Notify unit

maintenance as soon as possible if

machine gun does not function

properly.

If rate of fire can

not be increased

by cleaning; or

changing gas

plug setting (#2

or #3) during

firing, notify unit

maintenance.

0020 00-11

PREVENTIVE MAINTENANCE CHECKS

AND SERVICES (cont) 0020 00

Table 1. Preventive Maintenance Checks and Services (cont)

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

7 D Buffer

Assembly/

Buffer and

Spade

Grip

Assembly/

Buttstock

and Buffer

Assembly

If plug becomes loose on buffer

assembly (M240/M240C/M240D/

M240E1) or the buttstock appears

loose (M240B/M240G/M240N),

machine gun needs to be returned to

unit maintenance to ensure proper

assembly.

Plug is loose on

buffer; or

buttstock

appears loose.

BACK PLATE

LATCH

SPRING PIN

2AN0037

0020 00-12

Item

No. Interval

Item to be

Checked/

Serviced

Procedure Not Fully Mission

Capable If:

WARNING

Be sure to clear weapon before disassembling, clearing, inspecting, transporting,

or storing.

8 A Barrel

Assemb-

lies

Check chamber and bore for

obstructions.

Remove heat shield to allow cleaning

and lubrication of barrel assembly

(M240B only) (WP 0021 00).

BARREL

2AN0042

CHAMBER

9 A Machine

Gun (all

models)

Disassemble, clean, inspect,

lubricate, and reassemble machine

gun (WP 0021 00 through WP 0023

00).

Any part is

broken, missing,

or damaged to

the extent that it

could cause gun

to malfunction.

0020 00-13/14 blank

MAINTENANCE PROCEDURES –

FIELD STRIPPING 0021 00

Clear your machine gun. (WP 0010 00)*.

Depress barrel locking latch and hold.

Turn barrel release/carrying handle to upright position.

Remove barrel. Push forward and lift out barrel.

BARREL

RELEASE

BARREL

LOCKING

LATCH BARREL

RELEASE

CARRYING

HANDLE

2AN0043

_______

*To change barrels follow these four steps.

0021 00-1

MAINTENANCE PROCEDURES –

FIELD STRIPPING (cont) 0021 00

M240B: Remove heat shield assembly from barrel. Lift rear of heat shield

assembly off barrel then pry front tabs out of holes on gas hole bushing.

HEATSHIELD

2AN0044

Depress spring and remove spring pin. (This can usually be done without tools).

SPRING PIN

SPRING

2AN0045

TRIGGER

HOUSING

ASSEMBLY

Pull trigger housing down and back. Pull charge cable through cable guide

(M240/M240C).

0021 00-2

Depress back plate latch and lift buffer/buttstock and buffer assembly/buffer and

spade grip assembly straight up.

Depress driving spring in; up; and out.

M240/M240C

BUFFER

M240D/M240E1

BUFFER AND

SPADE GRIP

ASSEMBLY

M240B (HYDRAULIC BUFFER)/

M240G/M240N

BUTTSTOCK AND

BUFFER ASSEMBLY

2AN0046

0021 00-3

MAINTENANCE PROCEDURES –

FIELD STRIPPING (cont) 0021 00

Depress cover latches and raise cover assembly. Pull cocking handle assembly,

or charging handle assembly (M240/M240C) back; then pull bolt and operating

rod assembly out.

BOLT AND

OPERATING ROD

ASSEMBLY

COVER

ASSEMBLY

CABLE

ASSEMBLY

COCKING HANDLE ASSEMBLY

(ALL MODELS EXCEPT M240/M240C)

COVER

LATCH

2NA0047

0021 00-4

Close cover. Push out spring pin as far as possible with the back or buffer. Then

remove pin with fingers. Depress cover latches, lift upward and remove cover

assembly. Remove feed tray.

M240 M240C

ALL MODELS

EXCEPT M240/M240C

COVER

ASSEMBLY

SPRING

PIN SPRING

SPRING

FEED

TRAY

FEED

TRAY

FEED

TRAY

2NA0048

0021 00-5

MAINTENANCE PROCEDURES –

FIELD STRIPPING (cont) 0021 00

M240B/M240G: Extend bipod legs to down and locked position.

2NA0049

END OF WORK PACKAGE

0021 00-6

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR 0022 00

WARNING

Be sure to clear weapon before disassembling, cleaning,

inspecting, transporting, or storing

Using gasoline, kerosene, hydraulic oil, benzene, bensol, high-

pressure water, steam, or air for cleaning is prohibited.

CAUTION

Do not use abrasives to clean the bore, piston, gas cylinder, or

gas regulator plug.

Do not submerge the buffer in any liquid. Wipe with clean

wiping rag only.

Do not allow cleaning solvents to come in contact with the

rubber handle of the charger cable (M240/M240C).

Do not apply lubricants to composite/rubber components.

0022 00-1

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY

Press in and rotate collar counterclockwise until it releases, then pull it out.

COLLAR

2AN0050

0022 00-2

NOTE

If the plug cannot be removed by hand from the gas regulator,

send the gun to unit maintenance for removal.

Pull gas regulator plug from gas hole bushing.

PLUG

GAS

BUSHING

2AN0051

0022 00-3

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY (cont)

USING SCRAPER TO REMOVE CARBON

WARNING

Use care when removing excess carbon, carbon may chip off

and fly into eyes.

Remove cover from scraper.

Insert scraper into center hole of gas regulator plug. Twist scraper clockwise to

remove carbon from center hole until scraper is fully seated against gas regulator

plug.

2AN0052

COVER

SCRAPER PLUG

0022 00-4

Fold scraper and press point into groove. Turn gas regulator plug clockwise to

remove carbon from groove on gas regulator plug.

3

2AN0053

SCRAPER

PLUG

GROOVE

POINT

0022 00-5

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY (cont)

USING SCRAPER TO REMOVE CARBON (cont)

Pivot scraper blade 180O to opposite side and place groove tip of scraper into

groove of gas regulator plug and turn clockwise to remove carbon from groove

on plug.

2AN0054

SCRAPER

PLUG

GROOVE

0022 00-6

With tip of scraper, scrape carbon from surface of gas regulator plug.

SCRAPER

PLUG

TIP

2AN0055

0022 00-7

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY (cont)

USING REAMER TO REMOVE CARBON

NOTE

When using reamers, apply hand pressure only.

Insert small reamer into each gas inlet hole of gas regulator plug and twist back

and forth to remove the carbon.

2AN0056

SMALL REAMER

LARGE REAMER

PLUG

SMALL REAMER

0022 00-8

Insert large reamer through hole in gas port bushing into gas port hole in barrel;

twist back and forth until reamer enters bore of barrel to remove carbon.

2AN0057

LARGE REAMER

BARREL

0022 00-9

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY (cont)

Remove dirt and corrosion from bore using cleaning rod and swab (item 8, WP

0040 00), dampened with CLP (item 1, WP 0040 00). Remove dirt and corrosion

from other parts using wiping rag, (item 7, WP 0040 00) dampened with CLP

(item 1, WP 0040 00) or RBC (item 3, WP 0040 00). Lightly lubricate with CLP

(item 1, WP 0040 00), LAW (item 4, WP 0040 00), LSA (item 6, WP 0040 00), or

LSA-T (item 5, WP 0040 00 (Marine Corp only)).

Inspect for cracks, dents, burrs, or other damage on flash hider/suppresser,

barrel adapter, carrying handle, barrel release and front sight.

BARREL RELEASE

BARREL; ADAPTER

CLEANING ROD

FLASH HIDER/

SUPPRESSOR

SWAB

2AN0058

0022 00-10

NOTE

Primary setting for gas plug is setting #1 (refer to WP 0008 00).

This design is intended to maintain a consistent rate of fire

under adverse conditions and is not to increase the rate of fire.

Gas inlet setting #1 is the preferred setting for normal

conditions. If gas regulator plug has been set to setting #2 or #3

to increase firing rate, take corrective action and return to

primary setting #1 (WP 0008 00).

Gas regulator may need to be changed to setting #2 for firing

blank ammunition. After cleaning, return to setting #1 for firing

of standard ammunition.

Place gas regulator plug with gas inlet setting #1 hole facing the barrel.

2AN0059

BARREL

PLUG

NUMBER 1

PLUG

0022 00-11

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

BARREL ASSEMBLY (cont)

Install collar on gas regulator plug. Rotate collar until it slips onto gas regulator

plug. Press in and rotate to lock in place (pull collar to be sure it is in the locked

position).

COLLAR

2AN0050

0022 00-12

M240B: Install heat shield on barrel. Make sure front tabs snap into hole on gas

hole bushing, then push down onto barrel.

FRONT TABS HEAT SHIELD

ASSEMBLY

GAS BUSHING

HOLE

2AN0060

0022 00-13

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

COVER ASSEMBLY

CAUTION

Do not use brushes when cleaning cover assembly, use clean

rag only.

Check cover assembly for smooth operation, spring tension, bent, or missing

parts, or excessive wear.

Check accessory mounting rail (if present) for nicks or burrs, which will prevent

proper attachment of optional sighting devices.

O

2NA0061

O - LIGHTLY LUBE MOVING PARTS

0022 00-14

Check for bends, cracks, and free movement of cocking handle assembly or

charger cable assembly (M240/M240C), and excessively worn, burred, or

chipped rails. Check barrel locking latch and cover detent for proper spring

tension.

COCKING HANDLE

ALL MODELS EXCEPT

M240/M240C

CHARGER

CABLE

BARREL

LOCKING LATCH

COVER

DETENT

RAILS

2AN0062

0022 00-15

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

TRIGGER ASSEMBLY

M240/M240C: Check for broken grips, bent cable guide, loose nut and bolt, and

chipped or cracked trigger housing holding lug.

HOLDING

LUD

TRIPPING

LEVER SEAR

TRIGGER

NUT AND

BOLT

GRIP

SAFETY

CABLE

GUIDE

2AN0063

0022 00-16

M240D/M240E1: Check for broken grips, and chipped or cracked trigger housing

holding lug. Check for bent, cracked or broken trigger actuating assembly,

butterfly trigger or actuating arm. Check for loose or missing nut, bolt and

screws.

TRIPPING

LEVER

HOLDING

LUG

SEAR

TRIGGER

ACTUATING

ASSEMBLY

NUT AND

BOLT

GRIP

SAFETY ACTUATOR

ARM

GRIP

SCREW

BUTTERFLY

TRIGGER

2AN0064

0022 00-17

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

TRIGGER ASSEMBLY

M240B/M240G/M240N: Check for broken grips, and chipped or cracked trigger

housing lug. Ensure trigger guard does not interfere with full operation of trigger.

SAFETY

(FIRE POSITION)

TRIGGER

TRIPPING LEVER

SEAR

2AN0065

GRIP

HOUSING

LUG

0022 00-18

Check tripping lever and sear for burrs, cracks, and wear.

Notify unit maintenance if problems exist.

NOTE

To place safety to “S” safe, the sear must be up.

Check cocking action by pushing back on tripping lever (sear will raise). Pull

trigger (sear will lower).

Check safety functions. When safety in placed to “S” safe, pull trigger (sear will

not lower). When safety is placed to “F” fire, pull trigger (sear will lower).

Lightly lubricate tripping lever and sear surfaces.

0022 00-19

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

OPERATING ROD

USING COMBINATION TOOL TO CLEAN CARBON FROM PISTOL HEAD

CAVITY

CAUTION

Do not use abrasives to clean the operating rod piston.

Be sure tool bottom is securely against face of piston.

Insert combination tool into bottom of cavity of piston end of operating rod.

Squeeze handles firm ly and twist combination tool clockwise to remove carbon.

FACE OF

PISTON

COMBINATION

TOOL

BOTTOM

OPERATING

ROD

2AN0066

0022 00-20

Insert screwdriver end of combination tool into cavity of piston end of operating

rod to remove carbon residue in bottom of cavity.

Clean all other areas of operating rod, firing pin, and spring pin, with wiping rig

(item 7, WP 0040 00) dampened with CLP (item 4, WP 0040 00). Lightly

lubricate after cleaning.

COMBINATION

TOOL OPERATING

ROD

2AN0067

Check bolt and operating rod assembly for burrs, cracks, broken pins, or frozen

roller. Push down on roller to make sure it will retract. Check driving spring for

broken strands. If two or more strands are broken on the same coil or three or

more strands in any location, notify unit maintenance.

0022 00-21

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

OPERATING ROD (cont)

USING COMBINATION TOOL TO CLEAN CARBON FROM PISTON HEAD

CAVITY (cont)

NOTE

Do not lubricate face of bolt. Do not lubricate piston.

O – Lightly lubricate driving spring. Lightly lubricate bolt and operating rod

assembly moving parts, polished areas, firing pin, and roller.

FIRING

PIN OO

O

PISTON

BOLT AND OPERATING

ROD ASSEMBLY

O

DRIVING

SPRING

2AN0068

0022 00-22

RECEIVER

USING COMBINATION TOOL TO CLEAN GAS CYLINDER END OF

RECEIVER BODY

CAUTION

Do not use an abrasive to clean gas cylinder end of receiver.

Insert combination tool with handle upward carefully into the forward end of the

gas cylinder of the receiver body.

GAS

CYLINDER COMBINATION

TOOL

2AN0069

0022 00-23

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

RECEIVER (cont)

USING COMBINATION TOOL TO CLEAN GAS CYLINDER END OF

RECEIVER BODY (cont)

CAUTION

If combination tool is not properly seated, it could cause damage

to smaller diameter of gas cylinder.

Be sure the combination tool shoulder is fully inserted and seated against the

forward end of gas cylinder in receiver body.

GAS

CYLINDER COMBINATION

TOOL

2AN0069

0022 00-24

Apply slight pressure to handles and turn combination tool clockwise to remove

carbon.

Clean gas cylinder bore with gas cylinder cleaning brush dampened with CLP

(item 1, WP 0040 00) or RBC (item 3, WP 0040 00).

GAS

CYLINDER

GAS CYLINDER

CLEANER BRUSH

2AN0070

0022 00-25

MAINTENANCE PROCEDURES –

CLEANING INSPECTION, AND REPAIR (cont) 0022 00

RECEIVER (cont)

With wiping rag (item 7, WP 0039 00) dampened with CLP (item 1, WP 0040 00)

or RBC (item 3, WP 0040 00), remove dirt and corrosion from area under front

access cover of receiver and all other parts and areas.

Ensure proper operation of ejection port cover (M240B/M240N) and bipod latch

(M240B/M240G).

BIPOD LATCH

ACCESS COVER EJECTION

PORT COVER 2AN0071

END OF WORK PACKAGE

0022 00-26

MAINTENANCE PROCEDURES –

REASSEMBLY 0023 00

Position feed tray and cover assembly on receiver; push cover assembly forward;

close cover and insert spring pin.

NOTE

Insert spring pin from right side.

M240 M240C

ALL MODELS

EXCEPT M240/M240C

COVER

ASSEMBLY

SPRING

PIN SPRING

SPRING

FEED

TRAY

FEED

TRAY

FEED

TRAY

2NA0048

0023 00-1

MAINTENANCE PROCEDURES –

REASSEMBLY (cont) 0023 00

Open top cover assembly. Set bolt and operating rod assembly on top of rails

(inside receiver). Extend bolt to unlocked position; push the assembly all the way

into the receiver. Close cover assembly and lock.

BOLT AND OPERATING

ROD ASSEMBLY

COVER

ASSEMBLY

UNLOCKED

LOCKED

RECEIVER

BOLT

ASSEMBLY

2AN0072

Insert driving spring into operating rod assembly. Push it in fully and lower it to

seat the stud in hole of receiver.

0023 00-2

NOTE

Be sure operating rod assembly is properly seated in receiver

before operating weapon. Top of buffer/buffer and spade

grip/buttstock should be flush with top of receiver.

Install buffer assembly/buffer or spade grip assembly/buttstock and buffer

assembly and make sure it latches.

M240/M240C

BUFFER

M240D/M240E1

BUFFER AND

SPADE GRIP

ASSEMBLY

M240B (HYDRAULIC BUFFER)/

M240G/M240N

BUTTSTOCK AND

BUFFER ASSEMBLY

2AN0046

0023 00-3

MAINTENANCE PROCEDURES –

REASSEMBLY (cont) 0023 00

NOTE

Charger cable is on the M240/M240C models only.

Pin can be inserted from either side. For M240B/M240G/

M240N insert from right side only.

Place safety in fire position; position front of housing assembly into place

and pivot into position.

Slide charger cable (M240/M240C) through cable guide and position trigger

housing assembly into place. Insert spring pin.

CABLE

GUIDE SPRING

SPRING

PIN TRIGGER

HOUSING

TRIGGER

HOUSING

CABLE

2AN0073

0023 00-4

WARNING

Before firing, make sure the barrel is locked tightly in receiver.

If the barrel is not locked tight, threads in receiver could be

damaged or cause personal injury.

NOTE

Barrel must be in upright position when installing barrel.

Insert barrel fully into socket and push barrel release/barrel carrying handle

clockwise as far as it will go.

RECEIVER

SOCKET

BARREL RELEASE

BARREL

RELEASE

CARRYING

HANDLE

2AN0074

0023 00-5

MAINTENANCE PROCEDURES –

REASSEMBLY (cont) 0023 00

Release barrel release/barrel carrying handle and return to upright position.

Push barrel release/barrel carrying handle clockwise while counting the clicks

(fewer than 2 or more than 7 clicks indicate defective parts) to lock. If barrel

binds in socket or if barrel release/barrel carrying handle will not rotate when

pushed, do not pound on barrel release/barrel carrying handle. Take machine

gun to unit maintenance.

RECEIVER

SOCKET

BARREL RELEASE

BARREL

RELEASE

CARRYING

HANDLE

2AN0074

END OF WORK PACKAGE

0023 00-6

MAINTENANCE PROCEDURES –

SAFETY/FUNCTION CHECK 0024 00

Place safety to “F” fire. Pull cocking handle (charger cable (M240/MM240C)) to

rear to lock bolt back. Return cocking handle to forward, locked position.

Place safety to “S” safe position, depress trigger, nothing should happen.

S

2AN0015

ALL MODELS EXCEPT

M240/M240C

0024 00-1

MAINTENANCE PROCEDURES –

SAFETY/FUNCTION CHECK 0024 00

Place safety to “F” fire. Hold cocking handle assembly (charger cable (M240/

MM240C)) to rear, depress trigger, and ease bolt forward to close and lock.

S

2AN0015

ALL MODELS EXCEPT

M240/M240C

END OF WORK PACKAGE

0024 00-2

LUBRICATION 0025 00

Under all but the coldest artic conditions, LSA (item 6, WP 0040 00), CLP (item

1, WP 0040 00), or LSA-T (item 5, WP 0040 00)(Marine Corps only), are the

lubricants to use on your machine gun. Remember to remove excessive oil from

the bore before firing.

NOTE

Lubrication instructions are mandatory. Do not mix lubricants on

the same weapon. The weapon must be thoroughly cleaned

during change from one lubricant to another. Cleaning solvent

(available to unit maintenance) is recommended for cleaning

during change from one lubricant to another. Only lubricants

and cleaners specified in this manual are authorized for use on

this weapon.

0025 00-1

LUBRICATION (cont) 0025 00

+10OF

(-12OC)

-10OF

(-23O

C)

2AN0075

CLP –Cleaner, lubricant and preservative

(item 1, WP 0040 00).

LSA – Weapons lubricating oil, semi-fluid

(item 6, WP 0040 00).

LSA-T – Weapons lubricating oil, semi-

fluid, with Teflon (item 5, WP 0040 00).

Between 10OF (-12OC) and –10OF (-23OC)

use CLP, LSA or LAW. Below –10OF

(-23OC) use only LAW.

LAW – Weapons lubricating oil, artic

(item 4, WP 0040 00).

Lightly lube – A film of oil barely visible to

the eye.

0025 00-2

WARNING

Be sure to clear your weapon before disassembling, cleaning,

inspecting, transporting or storing.

After firing, field strip your machine gun (WP 0021 00). Clean bore and chamber

with cleaning rod, chamber brush, bore brush, and swab (item 8, WP 0040 00)

soaked with RBC (item 3, WP 0040 00) or CLP (item 1, WP 0040 00) until a

clean swab can be run through the bore without getting dirty.

CLEANING ROD SWAB

BORE BRUSH CHAMBER BRUSH

2AN0076

0025 00-3

LUBRICATION (cont) 0025 00

Clean powder-fouled parts, except the buffer, with a wiping rag (item 7, WP 0040

00) dampened with RBC (item 3, WP 0040 00) or CLP (item 1, WP 0040 00).

Wipe dry and lube as required. Inspect and run a lightly oiled swab (item 8, WP

0040 00) through the bore and chamber (WP 0022 00).

If your machine gun isn’t used, it still needs complete cleaning and lubing at least

every 90 days. (Unusual conditions could shorten this interval.)

0025 00-4

ADJUSTMENT OF SIGHTS 0026 00

GENERAL

NOTE

Perform this adjustment procedure only if barrel assembly/front

sight assembly has been replaced or if there is a new operator.

Proper trigger control is pulling the trigger all the way to the way

to the rear and then releasing completely. Squeezing the trigger

can cause accelerated wear on the trigger tripping lever, sear,

and operating rod leading to a run-away gun.

Check for the following prior to making adjustments:

• Cleanliness of barrel front sight.

• Cleanliness of contact surfaces of the barrel adapter, barrel, and

receiver.

• Rigidity and good condition of the slides and rear sight base.

• Correct assembly of flash hider/suppressor.

• Correct assembly of barrel to receiver.

0026 00-1

ADJUSTMENT OF SIGHTS (cont) 0026 00

ADJUSTMENT OF SIGHT FOR ELEVATION

Lift the front sight retaining strap to the vertical position using the front sight

adjustment tool.

Rotate the front sight blade one or more half turns using the front sight

adjustment tool.

• At a range of 10 meters, one-half turn of the front sight blade will move

the strike of the round by approximately 0.5 cm (1/5 inch). One full turn

will move the strike of the rounds by approximately 1.0 cm

(approximately 3/8 inch).

• If the center of the shot group is above the point of aim, raise the front

sight blade by turning it counter-clockwise.

• If the center of the shot group is below the point of aim, lower the front

sight blade by turning it clockwise.

0026 00-2

2

1

2AN0077

0026 00-3

ADJUSTMENT OF SIGHTS (cont) 0026 00

ADJUSTMENT OF SIGHT FOR ELEVATION (cont)

NOTE

There are two types of front sight blades. The number 1 blade

is 9.8 mm tall; the number 2 blade is 11.18 mm tall.

9.8

11.8

21

2AN0078

If the required correction cannot be obtained with the installed front sight blade,

you may need to install the other blade.

0026 00-4

• The maximum unscrewed position of either blade is where the base of

the blade is flush with the front sight protector surface. If the center of

the shot group is still above the point of aim with the number 1 blade

unscrewed to the maximum position, remove it and install a number 2

blade. Start with the number 2 blade at a flush position, two full turns

(clockwise) should approximate the same position as the number 1

blade.

• If the center of the shot group is still below the point of aim with the

number 2 blade screwed all the way in (clockwise), remove it and install

a number 1 blade. Starting with the number 1 blade screwed clockwise,

two full turns (counter-clockwise) should approximate the same position

as the number 2 blade.

• If the center of the shot group cannot be brought to the point of aim after

trying both sight blades, the spare barrel (BII) should be used and a new

barrel assembly acquired. If neither barrel assembly can be adjusted,

the weapon should be coded and turned in through normal channels.

0026 00-5

ADJUSTMENT OF SIGHTS (cont) 0026 00

ADJUSTMENT OF SIGHT FOR WINDAGE

Move the front sight protector to the right or left according to the correction that is

needed.

• At a range of 10 meters, one complete rotation (360O) of the adjusting

screws will move the center of the shot group 0.8 cm (approximately 1/3

inch).

• If the center of the shot group is to the left of the point of aim, move the

front sight protector to the left. To move the front sight protector to the

left, first unscrew the screw on the left side (looking from the rear of the

weapon) of the sight protector more than the number of turns needed

for the sight correction. Then screw in the right side of the front sight

protector the desires number of turns. Finally screw in the left side of

the sight protector fully home.

• If the center of the shot group is to the right of the point of aim, move the

front sight protector to the right. To move the front sight protector to the

right, first turn the hex adjusting screw on the right counter-clockwise to

loosen it the desired amount. Then turn the hex adjusting screw on the

left side clockwise the same number of turns to tighten.

0026 00-6

ASSOCIATED EQUIPMENT (M240B/M240G) 0027 00

A – Tripod Leg Assembly.

B – Traversing and Elevating (T&E) Mechanism.

C – Flexible Mount Assembly (M240G only). Houses T&E adapter bracket and

pintle. Absorbs recoil of weapon, improving accuracy.

D – Pintle Mount (M240B).

E - Fork Assembly (M240B).

E

D

C

B

A

2AN0079

0027 00-1/2 blank

MOUNTING T&E MECHANISM AND

PINTLE ASSEMBLY TO TRIPOD (M122A1) 0028 00

Place the pintle assembly (1) into the sleeve bushing on the tripod leg assembly

(2).

Release the pintle lock (3) on tripod leg assembly to secure the pintle assembly

to the tripod.

2AN0080

1

2

3

0028 00-1

MOUNTING T&E MECHANISM AND

PINTLE ASSEMBLY TO TRIPOD (M122A1) 0028 00

NOTE

Deflector on fork assembly should deflect to the right.

If not already assembled, align holes in fork assembly (4) with holes in T&E (5).

Insert pin (6) through fork assembly and T&E and secure with “C” clamps (7).

2AN0081

45

6

7

8

2

9

0028 00-2

Place T&E assembly (5) (with the fork assembly attached) onto the traverse bar

(8) of tripod leg assembly (2). Lock T&E mechanism into place by turning lock

lever (9) clockwise.

NOTE

For maintenance and repair of the M122A1 tripod, refer to TM 9-1005-

245-13&P.

END OF WORK PACKAGE

0028 00-3/4 blank

MOUNTING WEAPON ON

M122A1 TRIPOD ASSEMBLY 0029 00

Position weapon over tripod assembly with T&E mechanism and pintle installed.

2AN0082

5

4

6

1

2

3

0029 00-1

MOUNTING WEAPON ON

M122A1 TRIPOD ASSEMBLY 0029 00

Tilt muzzle down slightly and insert the weapons front receiver bushing (1) into

the slots in the pintle assembly (2). Insert quick release pin (3) through pintle (2)

and front receiver bushing (1).

2AN0082

5

4

6

1

2

3

0029 00-2

Lower the rear of the weapon into the fork assembly (4). Align the mounting hole

(5) in trigger housing with hole in fork assembly (4).

Insert spring pin (6) through the holes in trigger assembly and fork, insuring

weapon is securely attached.

END OF WORK PACKAGE

0029 00-3/4 blank

MOUNTING T&E MECHANISM AND

FLEXIBLE MOUNT ASSEMBLY TO M122 TRIPOD 0030 00

Place the pintle (1) of the flexible mount assembly into the sleeve bushing (2) on

the tripod leg assembly (3).

Release the pintle lock (4) on tripod leg assembly to secure the flexible mount

assembly to the tripod leg assembly (3).

1

2

3

4

2AN0084

0030 00-1

MOUNTING T&E MECHANISM AND

FLEXIBLE MOUNT ASSEMBLY TO M122 TRIPOD 0030 00

If not already assembled, align holes in flexible mount T&E cradle bracket (5)

with holes in T&E (6). Insert pin (7) through cradle bracket and T&E and secure

with “C” clamps (8).

1

2

3

4

2AN0085

5

6

7

8

0030 00-2

Place T&E assembly (9) (with the flex mount assembly attached) onto the

traverse bar (10) of tripod leg assembly (3). Lock T&E mechanism into place by

turning lock lever (11) clockwise.

2AN0086

3

11

9

10

NOTE

For maintenance and repair of M122 tripod, T&E, and flexible mount

assembly, refer to TM 9-1005-245-13&P.

END OF WORK PACKAGE

0030 00-3/4 blank

MOUNTING WEAPON ON FLEXIBLE MOUNT

ASSEMBLY AND M122 TRIPOD 0031 00

Position weapon over tripod assembly with flexible mount and T&E mechanism

installed.

Tilt muzzle down slightly and insert the weapons front receiver bushing (1) into

the front cradle slot of the flexible mount assembly (2). Pull the weapon to the

rear to fully seat the receiver bushings in the cradle.

2AN0087

1

2

0031 00-1

MOUNTING WEAPON ON FLEXIBLE MOUNT

ASSEMBLY AND M122 TRIPOD 0031 00

Lower the rear of the weapon onto the flexible mount assembly (2). Align the

mounting hole (3) in trigger housing with hole in the flexible mount (4).

Insert spring pin (5) through the hole in the flexible mount and receiver assembly.

Ensure weapon is securely attached to the flex mount.

2AN0088

5

4

3

2

END OF WORK PACKAGE

0031 00-2

MOUNTING WEAPON ON M6 PEDESTAL MOUNT

AND M197 MACHINE GUN MOUNT 0032 00

The weapon can be mounted on a M998 High Mobility Multipurpose Wheeled

Vehicle (HMMWV) (Cargo/Troop Carrier).

WARNING

Firing on-the-move is not permitted from the M998.

The canvas cover above the driver and passenger seats should

always be in place when firing.

Ground personnel should not be within 10 meters of the vehicle

when firing.

0032 00-1

MOUNTING WEAPON ON M6 PEDESTAL MOUNT

AND M197 MACHINE GUN MOUNT (cont) 0032 00

Assure clevis of pintle assembly slants to rear.

PINTLE

M6 PEDESTAL

M197 MOUNT

2AN0089

0032 00-2

Place weapon in pintle, aligning the front receiver bushing with the holes in the

pintle and secure with quick release pin.

2AN0090

0032 00-3

MOUNTING WEAPON ON M6 PEDESTAL MOUNT

AND M197 MACHINE GUN MOUNT (cont) 0032 00

Align the mounting hole in the trigger housing with the holes in the fork of the

mount and secure with quick release pin.

2AN0091

0032 00-4

CAUTION

When the weapon is not in use it should be removed from the

pedestal or secured by the travel lock.

NOTE

For mounting instructions of M6 Pedestal and M197 Mounts in

M998 HMMWV’s refer to TM 9-1005-245-13&P.

For maintenance and repair of M6 Pedestal and M197 Mounts,

refer to TM 9-1005-245-13&P.

2AN0092

END OF WORK PACKAGE

0032 00-5/6 blank

ATTACHMENT OF

AMMUNITION ADAPTER ASSEMBLY (M240B) 0033 00

Open cover, and raise feed tray.

Insert curved lip of the adapter assembly into slot located in the rail on the side of

receiver, below feed tray.

LIP

LEVER

ADAPTER

ASSEMBLY

SLOT

RECEIVER

2AN0093

0033 00-1

ATTACHMENT OF

AMMUNITION ADAPTER ASSEMBLY (M240B) (cont) 0033 00

Depress lever on the adapter assembly.

Push the adapter toward the receiver until it is against the receiver.

Release lever to allow the adapter assembly to secure itself onto the button on

the receiver.

LIP

LEVER

ADAPTER

ASSEMBLY

SLOT

RECEIVER

2AN0093

END OF WORK PACKAGE

0033 00-2

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

M24 BLANK FIRING ADAPTER

NOTE

Each weapon requires two M24 BFA’s (primary and spare barrel).

ATTACHMENT

Unscrew shaft (1) until it slides all the way to the rear. Install chamber device (2)

over the flash suppressor (3).

Slide shaft (1) into throat of flash suppressor. Engage threads on shaft into body

of chamber device (2); turn clockwise until hand tight.

12

2AN0094

0034 00-1

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

M24 BLANK FIRING ADAPTER (cont)

REMOVAL

NOTE

Allow barrels to cool until they can be held with bare hands prior

to removing the chamber device from the barrel.

Hold barrel and rotate chamber body (2) approximately 180O to break any carbon

seal between the shaft (1) and the suppressor (3).

Unscrew shaft (1) until threads disengage. Rem ove chamber device from flash

suppressor (3).

12

2AN0094

0034 00-2

M21 BLANK FIRING ATTACHMENT

The following restrictions must be observed to avoid hazardous concentrations of

gases caused while firing the M240 machine gun with the M21 BFA. A blank-fire

mission is limited to 200 rounds fired at a rate of 100 rounds per minute or less in

a 25-round bursts with gas regulator on weapon set at position number 1. Below

are vehicle operating mode/mission restriction requirements.

Table 1. Operating Mode Firing Restrictions

Vehicle System

Engine On

Heater Off

Hatches Open

Blower On

Engine Off

Heater Off

Hatches Open

Blower On

Engine On

Heater On

Hatches Closed

Blower On

M2/M3 BFVS None 7 times/24 hours 14 times/24 hours

LAV 25 (Coax) None 7 times/24 hours 14 times/24 hours

M1 Series Tank

(Coax) None 34 times/24 hours 48 times/24 hours

Effective use of the M21 BFA/M240 machine gun system is greatly dependant on

adherence to the installation instructions and mission scenario limits in the

instructions.

0034 00-3

M24 BLANK FIRING ADAPTER (M240B/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

ATTACHMENT OF CHAMBER AND DISCRIMINATOR ASSEMBLY

(M2/M3 BFV/M1 SERIES TANK/LAV 25 SERIES (USMC))

CAUTION

Take care not to damage threads on end of barrel. Barrel must

completely cooled before removing flash hider or attaching BFA.

Using 23mm box/open end combination wrench, remove flash hider from barrel

of weapon. Store flash hider in ordnance spare parts bag and place in oddment

tray in vehicle. Be sure to tag flash hider so it will remain with the barrel.

BARREL

FLASH HIDER

2AN0105

0034 00-4

Remove wire rope assembly from chamber.

Screw chamber onto end of barrel and tighten with box/open-end wrench.

Reattach wire rope assembly onto chamber

2AN0106

WIRE ROPE

CHAMBER

0034 00-5

M24 BLANK FIRING ADAPTER (M240B/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

ATTACHMENT OF CHAMBER AND DISCRIMINATOR ASSEMBLY

(M2/M3 BFV/M1 SERIES TANK/LAV 25 SERIES (USMC))

WARNING

Discriminator must be in place in feed tray of machine gun when

M21 BFA is in use to prevent live ammo from entering the barrel

chamber.

Open cover on receiver and

place discriminator in feed tray

with slot in discriminator over

front lip of tray.

Closing the cover will retain the

discriminator in place.

2AN0107

DISCRIMINATOR

COVER

0034 00-6

INSTALLATION OF WEAPON ONTO VEHICLE

Install M240C machine gun into BFV mount per TM 9-2350-252-10.

Install M240 machine gun onto exterior mount (M1 Tank) per TM 9-2350-255-10,

or into LAV 25 per TM 08594A-10/2 (USMC only).

Install M240E1 machine gun onto LAV 25 exterior mount per TM 08594A-10/2

(USMC only).

0034 00-7

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

INSTALLATION OF COUPLER ASSEMBLY AND EXTENSION ASSEMBLY

ON M240 (M1 TANK COAX ONLY)

Place coupler assembly over the chamber and clip coupler assembly clamp to

hold in place.

2AN0108

COUPLER

ASSEMBLY CHAMBER

CLAMP

0034 00-8

NOTE

If BFA/coupler assembly catches in smoke box, shake gun

slightly as you slide it forward.

Install M240 machine gun onto coax mount of M1 Series tank.

COAX

MOUNT

M240 MG

2AN0109

On outside of turret, loosen clamp on extension assembly so that the inside

diameter of the extension assembly will clear the outside diameter of the coax

mantlet. Do not remove clamp from extension assembly.

0034 00-9

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

INSTALLATION OF COUPLER ASSEMBLY AND EXTENSION ASSEMBLY

ON M240 (M1 TANK COAX ONLY) (cont)

Slide extension assembly into coax mantlet until extension is over end of coax

mantlet and bottomed. If resistance is encountered during installation, shake

extension assembly slightly while sliding into coax mantlet. Fully seat extension

assembly in place over the coax mantlet.

With clamp positioned over slots in extension assembly, tighten until strap is

snug against the mantlet.

CLAMP

EXTENSION

ASSEMBLY

COAX

MANTLET

2AN0110

0034 00-10

REMOVAL OF WEAPON FROM VEHICLE

Remove M240C machine gun from BFV mount per TM 9-2350-252-10.

Remove M240 machine gun from exterior mount (M1 Tank) per TM 9-2350-255-

10, or into LAV 25 per TM 08594A-10/2 (USMC only).

Remove M240E1 machine gun from LAV 25 exterior mount per TM 08594A-10/2

(USMC only).

0034 00-11

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

REMOVAL OF COUPLER ASSEMBLY AND EXTENSION ASSEMBLY ON

M240 (M1 TANK COAX ONLY)

Loosen clamp. Slide extension assembly out of coax mantlet. Tighten clamp on

extension assembly.

CLAMP

EXTENSION

ASSEMBLY

COAX

MANTLET

2AN0110

0034 00-12

Remove M240 from coax mount per TM 9-2350-255-10.

COAX

MOUNT

M240 MG

2AN0111

0034 00-13

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

REMOVAL OF COUPLER ASSEMBLY AND EXTENSION ASSEMBLY ON

M240 (M1 TANK COAX ONLY)

Unclip coupler assembly from chamber and remove (M1 Series Tank only).

COUPLER

ASSEMBLY

CLAMP

CHAMBER

2AN0112

0034 00-14

REMOVAL OF DISCRIMINATOR ASSEMBLY

Open cover of machine gun and remove discriminator assembly.

2AN0107

DISCRIMINATOR

COVER

0034 00-15

M24 BLANK FIRING ADAPTER (M240B/M240D/M240G/M240N)

AND M21 BLANK FIRING ATTACHMENT (M240/M240C/M240E1) 0034 00

REMOVAL OF DISCRIMINATOR ASSEMBLY (cont)

CAUTION

Do not remove chamber form machine gun barrel until both

items are cooled.

Take care not to damage threads on end of barrel.

Remove wire rope assembly from chamber.

2AN0106

WIRE ROPE

CHAMBER

0034 00-16

Loosen chamber with box/open-end combination wrench and unscrew from

barrel of weapon.

Replace wire rope assembly on chamber.

LEFT FEED

2AN0113

CHAMBER

WIRE ROPE

Replace flash hider on machine gun barrel.

BARREL FLASH HIDER

2AN0114

0034 00-17/18 blank

EMERGENCY EGRESS PACKAGE (M240D ONLY) 0035 00

The Emergency Egress Package is to be used only on the M240D. The package

consists of the following components:

• Buffer and Buttstock Assembly (1), P/N 12976851

• Trigger Assembly (2), P/N 12976869

• Bipod Assembly (3), P/N 12976883

12

3

2AN0115

0035 00-1

EMERGENCY EGRESS PACKAGE (M240D ONLY) (cont) 0035 00

WARNING

Be sure to clear your weapon before disassembling, clearing,

inspecting, transporting, or storing.

Clear your machine gun (WP 0010 00).

Depress backplate latch and lift buffer and spade grip assembly straight up.

Install buffer and buttstock assembly; make sure it locks in place.

Depress spring on trigger housing pin and remove pin/trigger housing assembly.

Place safety of infantry trigger housing assembly to “F” fire position. Position

front of housing assembly into place and pivot into position; install trigger housing

pin from right to left.

Attach the bipod lag assembly to the receiver by aligning the gaps in the bipod

head with the flanges on the receiver. Swivel the bipod assembly so it s in the

upright position. Drive the retaining pin into the cut-out in the bipod head.

END OF WORK PACKAGE

0035 00-2

CHAPTER 5

AMMUNITION

AMMUNITION 0036 00

WARNING

This is the only ammunition authorized for use in your machine

gun. If it is not shown, it is not authorized.

Ammunition that fails to fire will be disposed of by authorized

procedures.

BLACK

RED ORANGE

NATO 7.62 AMMO

4-1 COMBAT MIX

M80 M62 M172 M82

IMPROVED

BLANK

DUMMYTRACERBALL

ARMOR

PIERCING

M61/M993

2AN0095

0036 00-1

AMMUNITION (cont) 0036 00

Protect ammunition from mud, sand, and water. If the ammunition gets wet or

dirty, wipe it off at once with a clean, dry, rag (item 7, WP 0040 00). Wipe off

light corrosion as soon as it is discovered. Turn in heavily corroded cartridges.

Do not expose ammunition to the direct rays of the sun. If the powder is hot,

excessive pressure may develop when the weapon is fired.

Do not oil or grease ammunition. Dust and other abrasives that collect on greasy

ammunition may cause damage to the operating parts of the machine gun.

Moreover, oiled cartridges produce excessive chamber pressure.

Do not fire dented cartridges, cartridges with loose bullets, or otherwise defective

rounds.

END OF WORK PACKAGE

0036 00-2

CHAPTER 6

SUPPORTING INFORMATION

REFERENCES 0037 00

This work package lists all forms, field manuals, and miscellaneous publications

referenced in the manual.

ARMY REGULATIONS

AR 190-11.............................Physical Security of Arms, Ammunition and

Explosives

DEPARTMENT OF THE ARMY PAMPLETS

DA PAM 783-750.................The Army Maintenance Management System (TAMMS)

FIELD MANUALS

FM 21-11...............................First Aid for Soldiers

FM 3-5....................................NBC Decontamination

0037 00-1

REFERENCES (cont) 0037 00

FORMS

DA Form 2402......................Equipment inspection and Maintenance Worksheet

DA Form 2028......................Recommended Changes to Publications and Blank

Forms

SF 368 ...................................Product Quality Deficiency Report

TECHNICAL MANUALS

TM 9-1005-245-13&P..........Operator’s, Unit, and Direct Support Maintenance

Manual with Repair Parts and Special Tools List for

Machine Gun Mounts and Combinations for

Tactical/Armored Vehicles and Ground Mounting

TM 9-2350-252-10 ...............Operator’s Manual for Fighting Vehicle, Infantry,

Bradley

TM 9-2350-255-10 ...............Operator’s Manual for Operator Controls, PMCS, and

Operation Under Usual Conditions

TM 08594A-10/2...................Operator’s Manual for LAV-25

0037 00-2

TM 9-4933-273-12&P..........Operator’s and Unit Maintenance Manual (Including

RPSTL) for Boresighting Equipment, Weapon Small

Arms, M30

TM 9-4933-273-12&P..........Operator’s, Unit and Direct Support Maintenance

Manual (Including RPSTL) for Machine Guns Mounts

and Combinations fro Tactical/Armored Vehicles and

Ground Mounting

TM 750-244-7.......................Procedures for Destruction of Equipment in Federal

Supply Classification 1000, 1005, 1010, 1020, 1030,

1055, 1090, and 1095 to Prevent Enemy Use

MARINE CORPS PUBLICATIONS AND FORMS

TM 4700.15/1........................Equipment Report Procedures

MCO 4855.10 .......................Quality deficiency Report Manual

NAVMC Form 10722 ...........Recommended Changes to Publications

0037 00-3

REFERENCES (cont) 0037 00

RELATED PUBLICATIONS

CTA 8-100.............................Army Medical Department Expendable/Durable Items

CTA 50-970...........................Expendable/Durable Items (Except Medical, Class V,

Repair Parts, and heraldic Items)

END OF WORK PACKAGE

0037 00-4

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS 0038 00

This work package lists components of the end item and basic issue items for the

machine gun to help you inventory items required for safe and effective operation.

The Components of the End Item (COEI) and Basic Issue Items (BII) lists are

divided into the following:

Components of the End Item (COEI): This is for informational purposes only and

is not authority to requisition replacements. These items are part of the end item

but are removed and separately packaged for transportation or shipment. As part

of the end item, these items must be with the end item whenever it is issued or

transferred between property accounts. Illustrations are furnished to assist you in

identifying the items.

These are the minimum essential items required to place the machine gun in

operation, to operate it, and to perform emergency repairs. Although shipped

separately packaged, BII must be with the machine gun during operation and

whenever it is transferred between property accounts. The illustrations will assist

you with hard to identify items. This manual is your authority to request/

requisition replacement BII, based on TOE/MTOE authorization of the end item.

0038 00-1

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

EXPLANATION OF COLUMNS. The following provide an explanation of columns

found in the tabular listings:

Column (1) – Illus. Number, gives you the number of the item illustrated.

Column (2) – National Stock Number, the stock number of the item to be used for

requisitioning purposes.

Column (3) – Description and Usable On Code, identifies the Federal item name

(in capital letters) followed by a minimum description when needed. The last line

below the description is the CAGEC (in parenthesis) and the part number. If the

item you need is not the same for different models of the equipment, a Usable On

Code will appear on the right side of the description column on the same line as

the part number. These codes are identified

CODE USED ON CODE USED ON CODE USED ON

G69 M240 BC2 M240D BJ8 M240N

BB2 M240B AG8 M240E1

L04 M240C BC6 M240G

0038 00-2

Column (4) – U/M, indicates how the item is issued for the National Stock

Number shown in column (2).

Column (5) – Qty Rqd, indicates the quantity required.

Table 1. Components of End Item

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

1 1005-01-431-8324 ADAPTER, AMMUNITION

(19200) 12976909 BB2 EA 1

2AN0096

1

0038 00-3

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 1. Components of End Item (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

2 1005-01-439-6899 SLING W/HOOK

ASSEMBLY

(19200) 12976938

BB2 EA 1

2

2AN0097

0038 00-4

Table 2. Basic Issue Items

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

1 1005-01-044-1026 BARREL ASSEMBLY

(19200) 11825985 G69,

L04 EA 1

2 1005-01-251-9701 BARREL ASSEMBLY

(19200) 12597035 AG8 EA 1

3 BARREL ASSEMBLY

(19200) 12976817 BB2 EA 1

4 1005-01-408-5897 BARREL ASSEMBLY

(19200) 12976818 BC2,

BC6,

BJ8

EA 1

1

3

2

4

2AN0098

0038 00-5

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 2. Basic Issue Items (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

5 1005-01-033-3925 BRUSH, CLEANING, GAS

CYLINDER

(19200) 11826118

BC6,

BJ8 EA 1

6 1005-00-556-4174 BRUSH, CLEANING,

SMALL ARMS BORE

(10001) 5564174

BC6,

BJ8 EA 2

7 1005-00-690-3115 BRUSH, CLEANING,

SMALL ARMS CHAMBER

(19205) 7790452

BC6,

BJ8 EA 1

8 1005-00-350-4100 BRUSH, CLEANING,

SMALL ARMS RECEIVER

(19200) 8448466

BC2,

BJ8 EA 1

0038 00-6

0038 00-7

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 2. Basic Issue Items (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

9 8465-01-408-5431 CASE, CARRYING,

MACHINE GUN

(0EUP8) SSC/BMG/M240G

BC6 EA 1

10 1005-01-408-5422 CASE , CARRYING,

SPARE BARREL

(0EUP8) SSC/BBB/M240G

BC6 EA 1

11 1005-00-550-6573 CASE, SMALL SRMS

CLEANING ROD

(19204) 5506573

G69,

L04 EA 1

12 1005-01-038-6025 CASE SPARE BARREL

(19200) 11826275 G69,

L04,

AG8

EA 1

13 1005-01-442-8626 CASE, SPARE BARREL

(19200) 12977109 BC2,

BJ8 EA 1

14 1005-01-470-3006 CASE, SPARE BARREL

(19200) 12991853 BB2 EA 1

0038 00-8

910

11

12

13 14

2AN0101

0038 00-9

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 2. Basic Issue Items (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

15 4933-01-033-1510 EXTRACTOR, RUPTURED

CARTRIDG CASE

(19200) 11826264

EA 1

16 5340-01-265-2683 HANDLE ASSEMBLY,

CLEANING ROD

(19204) 12900436

BC6,

BJ8,

G69,

L04

EA 1

17 8415-01-092-0039 MITTEN, HEAT

PROTECTIVE M5337

(81349) MIL-M-11199

AG8,

BJ8,

G69,

L04

EA 1

18 5143-00-329-4306 POUCH, MECHANICS

TOOL

(80049) 50J8016

BJ8 EA 5

0038 00-10

15

16

17

2AN0102

18

0038 00-11

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 2. Basic Issue Items (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

19 4933-01-047-3394 REAMER

(19200) 11826036 BC6,

BJ8 EA 1

20 1005-00-726-6109 ROD, SECTION,

CLEANING, SMALL ARMS

(19205) 7266109

BC6,

BJ8,

G69,

L04

EA 1

21 4933-01-033-1504 SCRAPER, COMBINAT-

ION REGULATOR

(19200) 11826005

BC6,

BJ8 EA 1

22 1005-01-448-2614 SHIELD ASSEMBLY,

PROTECTIVE

(0EUP8) BB-M240G-HS

BC6 EA 1

23 1005-00-312-7177 SLING ASSEMBLY (W/O

HOOKS)

(19200) 12002983

BC6 EA 1

0038 00-12

0038 00-13

COMPONENTS OF THE END ITEM

AND BASIC ISSUE ITEMS (cont) 0038 00

Table 2. Basic Issue Items (cont)

(1)

ILLUS

NUMBER

(2)

NATIONAL STOCK

NUMBER

(3)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(4)

U/M

(5)

QTY

RQD

24 1005-00-726-6110 SWAB HOLDER SECTION

(19200) 7266110 BC6,

BJ8,

G69,

L04

EA 1

25 1005-01-411-9003 SWIVEL, HOOK, SLING,

CARRYING

(3S679) 3602004460

BC6 EA 2

26 1005-01-458-7004 TOOL, FRONT SIGHT

ADJUSTMENT TOOL

(19200) 12012086

BJ8 EA 1

27 4933-01-033-1503 TOOL, COMBINATION,

SCRAPER AND

EXTRACTOR

(19200) 11826059

BC6,

BJ8 EA 1

28 TM 9-1005-313-10 EA 1

0038 00-14

ARMY TM 9-1005-313-10

AIR FORCE T.O. 11W2-6-5-1

MARING CORPS TM 008670A-10/2A

NAVY SW360-AH-OPI-010

Supercedes copy dated 19 July 1996`

OPERATOR'S MANUAL FOR

MACHINE GUN, 7.62, M240 (1005-01-025-08095);

M240B (1005-01-412-3129); M240C (1005-01-085-4758);

M240D (1005-01-418-6995); M240E1 (1005-01-252-4288);

M240G (1005-01-359-2714) M240N (1005-01-493-1666)

DISTRIBUTION STATEMENT C: Distribution authorized to U.S. Government

agencies and their contractors. This publication is required for administration

and operational purposes, as determined 9 Jan 1989. Other request for this

document shall be reffered to: Tank-automotive and Armaments Command,

1 Rock Island Arsenal, Rock island, IL 61299-7630.

HEADQUARTERS, DEPARTMENTS OF THE ARMY,

AIR FORCE, AMRINE CORPS AND NAVY

JUNE 2002

24

25 26

28

27

2AN0104

0038 00-15/16 blank

ADDITIONAL AUTHORIZATION LIST AND

ASSOCIATED EQUIPMENT LIST 0039 00

This work package lists additional items you are authorized for the support of the

machine gun.

This list identifies items that do not have to accompany the machine gun and that

do not have to be turned in with it. These items are all authorized to you by CTA,

MOTE, TDA, or JTA.

EXPLANATION OF COLUMNS. National stock numbers, descriptions, and

quantities are provided to help you identify and request the additional items you

require to support the equipment. The items are listed in alphabetical sequence

by item name under the type document (i.e., CTA, MTOE, TDA, or JTA) which

authorizes the item(s) to you.

0039 00-1

ADDITIONAL AUTHORIZATION LIST AND

ASSOCIATED EQUIPMENT LIST (cont) 0039 00

Table 1. Additional Authorization List

(1)

NATIONAL STOCK

NUMBER

(1)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(3)

U/M

(4)

QTY

RQD

CTA AUTHORIZED ITEMS

1005-01-148-7437 BLANK FIRING ATTACHMENT, M21

(19200) 11833471 AG8,

G69,

L04

EA 1

1005-01-480-0289 BLANK FIRING ATTACHMENT, M24

(19200) 12993733 BB2,

BC2,

BC6,

BJ8

EA 2

1005-01-033-3925 BRUSH, CLEANING, GAS

CYLINDER

(19200) 11826118

EA 1

1005-00-556-4174 BRUSH, CLEANING, SMALL ARMS

BORE

(10001) 5584174

EA 2

1005-00-690-3115 BRUSH, CLEANING, SMALL ARMS

CHAMBER

(19205) 7790452

EA 1

0039 00-2

(1)

NATIONAL STOCK

NUMBER

(1)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(3)

U/M

(4)

QTY

RQD

1005-00-350-4100 BRUSH, CLEANING, SMALL ARMS

RECEIVER

(19204) 8448466

BB2 EA 1

1005-00-550-6573 CASE, SMALL ARMS CLEANING

ROD

(19304) 5506573

EA 1

5340-01-265-2683 HANDLE ASSEMBLY, CLEANING

ROD

(19204) 12900436

EA 1

8415-01-092-0039 MITTEN, HEAT PROTECTIVE

M5337

(81349) MIL-M-11199

BB2,

BC6 EA 1

4933-01-047-3394 REAMER, CLEANING

(19200) 11826036 EA 1

1005-00-726-6109 ROD SECTION, CLEANING, SMALL

ARMS

(19205) 7266109

EA 5

0039 00-3

ADDITIONAL AUTHORIZATION LIST AND

ASSOCIATED EQUIPMENT LIST (cont) 0039 00

Table 1. Additional Authorization List

(1)

NATIONAL STOCK

NUMBER

(1)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(3)

U/M

(4)

QTY

RQD

4933-01-033-1504 SCRAPER, COMBINATION

REGULATOR

(19200) 11826005

EA 1

1005-00-726-6110 SWAB HOLDER SECTION, SMALL

ARMS CLEANING

(19204) 7266110

EA 1

4933-01-033-1503 TOOL, COMBINATION SCRAPER

AND EXTRACTOR

(19200) 11826059

EA 1

0039 00-4

Table 2. Associated Equipment List

(1)

NATIONAL STOCK

NUMBER

(1)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(3)

U/M

(4)

QTY

RQD

CTA AUTHORIZED ITEMS

1005-01-413-4098 MOUNT, MACHINE GUN, M197

(19200) 12956264 BB2,

BC6 EA 1

1005-01-411-6341 MOUNT, PEDESTAL, MACHINE

GUN, M6

(19200) 12596270

BB2,

BC6 EA 1

1095-01-466-2065 RACK, STORAGE, SMALL ARMS

(19200) 12991083 BB2,

BC6 EA 1 per 9

weapons

MTOE AUTHORIZED ITEMS

1005-00-710-5599 MOUNT, TRIPOD, MACHINE GUN,

M122

(19200) 7790723

BC6 EA 1

1005-01-433-1617 MOUNT, TRIPOD, MACHINE GUN,

M122A1

(19200) 12976949

BB2 EA 1

0039 00-5

Table 2. Associated Equipment List (cont)

(1)

NATIONAL STOCK

NUMBER

(1)

DESCRIPTION

CAGEC AND PART NUMBER

USABLE

ON CODE

(3)

U/M

(4)

QTY

RQD

MTOE AUTHORIZED ITEMS (cont)

1005-01-411-6340 FLEXIBLE MOUNT ASSEMBLY

(19200) 12976940 BC6 EA 1

END OF WORK PACKAGE

0039 00-6

EXPENDABLE/DURABLE SUPPLIES

AND MATERIALS LIST 0040 00

This work package lists expendable/durable supplies and materials you need to

operate and maintain the machine gun. This is for informational purposes only

and is not authority to requisition the listed items. These items are authorized to

you by CTA 50-970, Expendable/Durable Items (Except Medical, Class V, Repair

Parts, and Heraldic items); or CTA 8-100, Army Medical Department Expendable/

Durable Items.

EXPLANATION OF COLUMNS.

Column (1) – Item Number. This number is assigned to the entry in the listing and

is referenced in the narrative instructions to identify the material (e.g., “Use

cleaner, lubricant and preservative (item 1, WP 0000 00)”).

Column (2) – Level. This column identifies the lowest level of maintenance that

requires the listed item.

C – Operator/Crew

Column (3) –National Stock Number. This is the National Stock Number assigned

to the item; use it to requisition the item.

0040 00-1

EXPENDABLE/DURABLE SUPPLIES

AND MATERIALS LIST (cont) 0040 00

Column (4) – Description. Indicates the Federal item name and, if required, a

description to identify the item. The last line for each item indicates the

Contractor and Government Entity Code (CAGEC) in parentheses followed by

the part number.

Column (5) - Unit of Measure (U/M). Indicates the measure used in performing

the actual maintenance function. This measure is expressed by a two-character

alphabetical abbreviation (e.g., EA, IN, PR). The unit of measure differs from the

unit of issue, requisition the lowest unit of issue that will satisfy your requirements.

0040 00-2

Table 1. Expendable/Durable Supplies List

(1)

ITEM

NO.

(2)

LEVEL

(3)

NATIONAL STOCK

NUMBER

(4)

DESCRIPTION

(5)

U/M

1 C

9150-01-102-1473

9150-01-079-6124

CLEANER, LUBRICANT AND

PRESERVATIVE, grade 2, (CLP)

(81349) MIL-PRF-63460

½ oz bottle

4 oz bottle

EA

2 C

9920-00-292-9946

CLEANER, TOBACCO, PIPE

(92849) DILLS

1 pkg (32 per pkg)

(Marine Corps only)

EA

3 C

6850-00-224-6656

6850-00-224-6657

CLEANING COMPOUND,

SOLVENT: rifle bore cleaner (RBC)

(81349) MIL-PRF-372

2 oz can

6 oz can

EA

4 C

9150-00-664-0038

LUBRICATING OIL, WEAPONS

(LAW)

(81349) MIL-PRF-14107

4 oz

EA

0040 00-3

EXPENDABLE/DURABLE SUPPLIES

AND MATERIALS LIST (cont) 0040 00

Table 1. Expendable/Durable Supplies List (cont)

(1)

ITEM

NO.

(2)

LEVEL

(3)

NATIONAL STOCK

NUMBER

(4)

DESCRIPTION

(5)

U/M

5 C

9150-00-949-0323

LUBRICATING OIL, WEAPONS

semi-fluid w/Teflon (LSA-T)

(81349) MIL-L-46150

8 oz bottle

(Marine Corps only)

EA

6 C

9150-00-889-3522

LUBRICATING OIL, WEAPONS

Semi-fluid (LSA)

(19204) MIL-L-46000

4 oz bottle

EA

7 C

7920-00-205-1711

WIPING RAG: cotton

(58536) A-A-531

50 lb bdl

LB

0040 00-4

(1)

ITEM

NO.

(2)

LEVEL

(3)

NATIONAL STOCK

NUMBER

(4)

DESCRIPTION

(5)

U/M

8 C

1005-00-288-3565

SWAB, SMALL ARMS CLEANING:

cotton

(19204) 5019316

1pkg (1000 per pkg)

EA

9 C

6920-00-078-5126

TARGET, BASIC MACHINE GUN

QUALIFICATION/10 METER

QUALIFICATION TARGET

(19204) 8426940

1box (200 per box )

(Marine Corps only)

BX

0040 00-5/6 blank

ALPHABETICAL INDEX 0041 00

WP/Page

A

Additional Authorized List and Additional Equipment List.............WP 0039 00-1

Adjustment of Sights............................................................................WP 0026 00-1

Ammunition ...........................................................................................WP 0036 00-1

Ammunition Adapter Assembly, Attachment of (M240B) ..............WP 0033 00-1

Associated Equipment.........................................................................WP 0027 00-1

C

Cleaning, Inspection, and Repair......................................................WP 0022 00-1

Components of End Item and Basic Issue Items Lists ..................WP 0038 00-1

Corrosion Prevention and Control.....................................................WP 0004 00-1

D

Destruction of Material to Prevent Enemy Use...............................WP 0005 00-1

E

Equipment Description and Data.......................................................WP 0007 00-1

Expendable/Durable Supplies and Materials List...........................WP 0040 00-1

0041 00-1

ALPHABETICAL INDEX (cont) 0041 00

WP/Page

F

Field Strip..............................................................................................WP 0021 00-1

H

How to Use This Manual.....................................................................vii

L

List of Effective Pages.........................................................................A

Lubrication Instructions .......................................................................WP 0025 00-1

M

M24 Blank Firing Adapter and

M21 Blank Firing Attachment........................................................WP 0034 00-1

Maintenance Forms, Records and Reports .....................................WP 0002 00-1

Mounting T&E Mechanism and

Pintle Assembly to Tripod (M122A1) ...........................................WP 0028 00-1

Mounting T&E Mechanism and

Flexible Mount Assembly to Tripod..............................................WP 0030 00-1

0041 00-2

M(cont)

Mounting Weapon on Flexible Mount Assembly on Tripod...........WP 0031 00-1

Mounting Weapon on M122A1 Tripod Assembly...........................WP 0029 00-1

Mounting Weapon on M6 Pedestal Mount and

M197 Machine Gun Mount............................................................WP 0032 00-1

O

Operation Under Usual Conditions ...................................................WP 0009 00-1

Bipod Operation (M240B/M240G)) ..............................................WP 0011 00-1

Clearing............................................................................................WP 0010 00-1

Definitions.........................................................................................WP 0012 00-1

Immediate Action ............................................................................WP 0013 00-1

Loading.............................................................................................WP 0009 00-1

Remedial Action..............................................................................WP 0014 00-1

Runaway Machine Gun..................................................................WP 0015 00-1

Ruptured Cartridge Case...............................................................WP 0017 00-1

Stuck Cartridge Case or Live Round ...........................................WP 0016 00-1

Operation Under Unusual Conditions ...............................................WP 0018 00-1

P

Preparation for Storage and Shipment.............................................WP 0006 00-1

Preventive Maintenance Checks and Services...............................WP 0020 00-1

0041 00-3

ALPHABETICAL INDEX (cont) 0041 00

WP/Page

R

References ............................................................................................WP 0037 00-1

Reporting Equipment Improvement Recommendations................WP 0003 00-1

S

Safety/Function Check........................................................................WP 0024 00-1

T

Technical Principles of Operation......................................................WP 0008 00-1

Troubleshooting Procedures:

Fails to chamber..............................................................................WP 0019 00-10

Fails to fire........................................................................................WP 0019 00-13

Fails to fire on initial burst..............................................................WP 0019 00-2

Failure to cock or runaway gun.....................................................WP 0019 00-17

Failure to eject.................................................................................WP 0019 00-15

Failure to extract..............................................................................WP 0019 00-14

Failure to feed..................................................................................WP 0019 00-4

Sluggish operation ..........................................................................WP 0019 00-9

Weapon stops firing........................................................................WP 0019 00-6

0041 00-4

ALPHABETICAL INDEX (cont) 0041 00

WP/Page

W

Warning Summary...............................................................................a

0041 00-5/6 blank

By Order of the Secretary of the Army, Air Force and Commandant of the Marine Corps.

Official:

JOEL B HUDSON ERIC K. SHINSEKI

Administrative Assistant to the General, United States Army

Secretary of the Army Chief of Staff

0215502

D.R. BLOOMER MICHAEL E. RYAN

Colonel, USMC General United States Air Force

Director, Program Support Chief of Staff

Marine Corps Systems Command

JERRY GASKILL

Small Arms Program Manager

Naval Sea Systems Command

DISTRIBUTION:

To be distributed in accordance with original distribution number (IDN) 400559,

requirements for TM 9-1005-313-10.

PIN: 033934-000

COVER M240 Machine Gun Manual TM 9 1005 313 10

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