M2hb Barrel Buffer

Lock depressors may have slight up and down movement as long as the movement does not cause the weapon to malfunction.

Check lock depressors (1) for failure to stay in barrel buffer body or tendency to move sideways (slight up and down movement is acceptable). Ensure rivets are not loose.

Lock depressors are cracked or broken.

Lock depressors pull out or are loose (sideways); excessive movement is present. Rivets are loose.

M2hb Depressors

Accelerator Pin

Check accelerator pin (2) for looseness or wear; broken, not set, or collapsed or missing spring.

Accelerator pin is loose or worn. Spring is broken, not set, collapsed, or missing.

Table 1. Direct Support Preventive Maintenance Checks and Services for

Machine Gun, M2 - Continued.

Table 1. Direct Support Preventive Maintenance Checks and Services for

Machine Gun, M2 - Continued.

ITEM NO.

INTERVAL

BE CHECKED

OR SERVICED

PROCEDURE

EQUIPMENT NOT READY/AVAILABLE IF:

8

Quarterly

Buffer Spring

Check that cotter pin (1) is present.

Check that rod and engaging notch (2) are not damaged.

Check that buffer spring (3) is not broken, deformed, or coils collapsed.

Rod and/or engaging notch are damaged.

Buffer spring is broken, deformed, or coils are collapsed.

Table 1. Unit Preventive Maintenance Checks and Services for Machine Gun, M2 - Continued.

ITEM

INTERVAL

MAN-

ITEM TO

EQUIPMENT NOT

NO.

HOURS

BE

PROCEDURE

READY/AVAILABLE

CHECKED

IF:

OR

SERVICED

9

Quarterly

Back Plate

Check upper (1) and lower (2)

Handle frames are bent,

Assembly

handle frames for bends,

cracked, or broken.

cracks, or breaks.

Buffer Tube

Check back plate buffer tube

Buffer tube leaks.

(3) for any fluids (oil, solvent,

or water) coming from the

inside of the buffer tube. Do

not submerge in water.

Buffer

Disassemble completely.

Disks are deformed,

Tube/Back

Check if disks (4) are

cracked, or collapsed.

Plate

deformed, cracked, or

Assembly

collapsed.

Handles

Check handle grips (5) for

Handle grips are cracked

cracks or missing screws (6).

or missing screws.

Bolt Latch

Check bolt latch release lock

Bolt latch release lock is

Release Lock

(7) for breaks or failure to

broken or fails to hold

hold bolt latch release (8)

bolt latch release

completely down.

completely down.

Bolt Latch

Check bolt latch release (8)

Bolt latch release is

Release

and spring (9) for cracks,

cracked, broken; or

collapsed spring, or breaks.

spring is missing or

Check if spring is broken or

collapsed.

missing. Check for proper

(crisp) spring action by

pressing on and releasing bolt

latch release.

Table 1. Unit Preventive Maintenance Checks and Services for Machine Gun, M2 - Continued.

ITEM NO.

INTERVAL

BE CHECKED

OR SERVICED

PROCEDURE

EQUIPMENT NOT READY/AVAILABLE IF:

(Cont)

Quarterly (Cont)

Assembly

(Cont)

Machine Gun Trigger

Trigger and Spring

Check trigger (10) and spring (11) for cracks or breaks; broken, collapsed, or missing spring. Check for proper (crisp) spring action by pressing on and releasing trigger.

Trigger is cracked or broken; or spring is missing or collapsed.

Table 1. Unit Preventive Maintenance Checks and Services for Machine Gun, M2 - Continued.

ITEM NO.

INTERVAL

MAN-HOURS

ITEM TO

BE CHECKED

OR SERVICED

PROCEDURE

EQUIPMENT NOT READY/AVAILABLE IF:

Quarterly

Safety (M48 Only)

Backplate

Before

Trigger Lever Stop Assembly

Timing

Adjustment Nut

Flat Spring

Place safety (1) in S (safe) position and attempt to fire.

Check for missing sleeve spacer (2). Check for proper (crisp) spring action by pressing on and releasing lock latch, manual lever, and trigger.

Cal New Backplate Safety Pic

Check if adjustable stop (1) is missing or broken, or has stripped screw threads (2).

Check for loose, stripped, or missing timing adjustment nut (3). Check installation (ensure notch is on top).

Check for weak, collapsed, cracked, or broken flat spring (4). When timing adjustment nut (3) is assembled, flat spring should be very hard to turn with one finger. Check flat spring for bends, cracks, collapse, or breaks. Ensure correct installation.

Sleeve spacer is missing. Spring action is weak. Spring is collapsed or broken.

Adjustable stop is broken, missing, or threads are stripped.

Timing adjustment nut is loose, stripped, missing, or incorrectly installed.

Flat spring is weak (easy to turn with one finger), cracked, collapsed, broken, bent, or improperly installed.

Table 1. Unit Preventive Maintenance Checks and Services for Machine Gun, M2 - Continued.

ITEM NO.

INTERVAL

MAN-HOURS

ITEM TO

BE CHECKED

OR SERVICED

PROCEDURE

EQUIPMENT NOT READY/AVAILABLE IF:

Before (Cont)

Before

Trigger Lever Stop Assembly (Cont)

M2hb Timing Nut

Trigger Lever

Check trigger lever (1) for binding, bends, cracks, or breaks.

Trigger lever binds, is bent, cracked, or broken.

Cal Machine Gun Diagram

Trigger Lever Pin

Check for bent or missing trigger lever pin (2) and for a broken lock (3).

Trigger lever pin is bent or missing; or lock is broken.

Guns With Bent Barrel

Table 1. Unit Preventive Maintenance Checks and Services for Machine Gun, M2 - Continued.

ITEM NO.

INTERVAL

MAN-HOURS

ITEM TO

BE CHECKED

OR SERVICED

PROCEDURE

EQUIPMENT NOT READY/AVAILABLE IF:

Quarterly

Front RH/LH Cartridge Stops

Link Stripper

Rear

Cartridge

Stops

+1 0

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