Manual Tecnico M249

CHAPTER 3

DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

CHAPTER OVERVIEW

This chapter contains information and instructions for the repairman to keep the machine gun in good repair. This chapter consists of repair parts; special tools; common tools and equipment; fabricated tools; troubleshooting; maintenance procedures; and final inspection. This chapter also contains information and instructions regarding preparation for storage and shipment, and pre-embarkation inspection of material.

Section I. REPAIR PARTS, SPECIAL TOOLS, COMMON TOOLS AND EQUIPMENT AND FABRICATED TOOLS

3-1. REPAIR PARTS. Repair parts are listed and illustrated in the repair parts and special tools list (app C) covering unit and direct support maintenance for this equipment.

3-2. SPECIAL TOOLS. Tools and test equipment are listed in appendix B.

3-3. COMMON TOOLS AND EQUIPMENT. For authorized common tools and equipment, refer to Modified Table of Organization and Equipment (MTOE) applicable to your unit.

3-4. FABRICATED TOOLS. Fabricated tools are listed and illustrated in appendix E.

Section Il. TROUBLESHOOTING

3-5. DIRECT SUPPORT TROUBLESHOOTING. Refer to troubleshooting table for malfunctions, tests, and corrective actions (para 2-8, pg 2-11).

Section Ill. MAINTENANCE PROCEDURES

NOTES

All assemblies/subassemblies will be clean prior to inspection and repair.

When a machine gun is received at direct support maintenance, all gaging requirements must be checked as a standing maintenance procedure. In addition, the weapon must be inspected and any other deficiencies found will be repaired, and noted for repair at the appropriate maintenance level. Weapons must be inspected and/or gaged at least once annually for safety and serviceability. Guard and reserve weapons are to be gaged and inspected at least once every two years after initial gaging unless usage, deployment or other maintenance indicates a need for more frequent inspection/gaging. It is recommended that training unit weapons be inspected/gaged after every training cycle. Regardless of weapon ownership, initial gaging/inspection will be one year after receipt of new or overhauled weapons. The appropriate interval starts at this time.

Burrs or raised surfaces may be removed or smoothed using a fine grit sharpening stone or crocus cloth (item 5, app D). DO NOT change the dimensions of any component by stoning. Cracks, chips, dents or gouges on components shall be reported to the appropriate maintenance level for repairs or replacement.

All assembly/subassembly parts will be lightly lubricated with Cleaner, Lubricant, and Preservative (CLP) (item 1, app D) prior to assembly unless otherwise specified.

3-6. MAINTENANCE OF MACHINE GUN.

This task covers:

Disassembly/Inspection/Repair/Reassembly

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, Small Arms Field Maintenance

TM 9-1005-201-10

SC 4933-95-CL-A11

TM 08671A-10/1A

Tool Kit, Small Arms Repairman

USMC TAM No. E2900

Materials/Parts

Cleaner, Lubricant, and Preservative (CLP)

(item 1 app D)

Personnel Required

Solid Film Lubricant (item 7, app D)

MOS 45B Small Arms Repairer

Masking Tape (item 8, app D)

MOS 2111 Infantry Weapon Repairer

Wiping Rags (item 3, app D)

(USMC)

DISASSEMBLY/INSPECTION/REPAIR/REASSEMBLY

WARNING

Make certain weapon is cleared and that there is no obstruction in the barrel or chamber (to include spare barrel).

1. Field strip weapon in accordance with TM 9-1005-201-10/TM 08671A-10/1A.

2. Visually inspect assemblies for damage.

3. Repair assemblies as required in accordance with chapters 2 and 3 of this manual.

4. Touch-up external surfaces (surfaces should not reflect light) as required, using Solid Film Lubricant (item 7, app D). Mask off areas that do not require touch-up, using Masking Tape (item 8, app D).

5. Lightly lubricate all metal surfaces of components, using CLP (item 1, app D) and Wiping Rags (item 3, app D), except as noted.

6. Reassemble in accordance with TM 9-1005-201-10/TM 08671A-10/1A.

WARNING

Barrels (to include spare barrel) and Bolts must NOT be interchanged with other M249 Machine Guns unless they have been checked for proper headspace.

HEATSHIELD ASSEMBLY

Deployment Hook Assembly

HEATSHIELD ASSEMBLY

BUTTSTOCK AND SHOULDER ASSEMBLY COVER & FEED 0R BUTTSTOCK/BUFFER MECHANISM ASSEMBLY OR STOCK, GUN, SHOULDER:M5 P. 3-16.1

GAS CYLINDER ASSEMBLY

SLING AND SNAP HOOK ASSEMBLY

GAS CYLINDER ASSEMBLY

SLING AND SNAP HOOK ASSEMBLY

Shotgun Buttstock Disassembly

RETURN ROD AND TRANSFER MECHANISM ASSEMBLY AND DRIVE SPRING.

TRIGGER MECHANISM ASSEMBLY P. 3-18

RETURN ROD AND TRANSFER MECHANISM ASSEMBLY AND DRIVE SPRING.

TRIGGER MECHANISM ASSEMBLY P. 3-18

3-7. MAINTENANCE OF BOLT ASSEMBLY.

This task covers:

Cleaning/Inspection/Repair

INITIAL SETUP

Materials/Parts

References

Cleaner, Lubricant, and Preservative (CLP)

TM 9-1005-201-10

(item 1, app D)

TM 08671A-10/1A

Wiping Rag (item 3, app D)

Inspection Penetrant (item 6, app D)

Personnel Required

Equipment Condition

MOS 45B Small Arms Repairer

Bolt Assembly removed.

MOS 2111 Infantry Weapon Repairer

and disassembled.

(USMC)

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