Warning

Before starting an inspection, be sure to clear the weapon. Do not actuate the trigger until the weapon has been cleared. Inspect the chamber to be sure that it is empty. Check to see that there are no obstructions in the barrel.

All small arms systems 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 every two years after initial gaging unless usage, deployment or other maintenance indicates need for a 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 weapon. The appropriate interval starts at this time.

GENERAL: Inspect all assemblies for missing, broken, or loose parts. Inspect parts for cracks, dents, burrs, excessive wear, rust, or corrosion. Make sure all parts are cleaned and lubricated (TM 9-1005313-10). Do not use cleaning solvents or lubricants on any composite/rubber components. Inspect external surfaces for adequate finish. Refinish if necessary using solid film lubricant (item 6, WP 0074 00). Repair or replace authorized defective parts or notify direct support maintenance if repair or replacement is not authorized (WP 0044 00 through WP0071 00).

Machine Gun a. Barrel Assembly (all models)

Field strip weapon (TM 9-1005-313-10).

Check barrel (1) for bulges, bends, burrs, and obstructions or pits in chamber or bore. Notify direct support maintenance if barrel is bulged, bent, burred, or if pitting causes extraction problems or appears to be excessive. Disassemble (WP 0009 00), inspect, clean (if necessary) and reassemble collar (2) and plug (3). Make sure flash hider/suppressor (4) is fasten securely.

Check for compliance with annual gaging requirements (headspace/barrel erosion). Ensure barrels are properly tagged as a set. Etching/stamping on barrel is not authorized. Notify direct support maintenance for scheduling of gaging.

Barrel has obstruction, bulge, excessive chamber or bore pitting.

Required gaging has not been performed or no record of gaging having been performed can be found.

Barrel Tagged
3

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)_

Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

(cont)

b. Barrel Assembly (M240B/ M240D/ M240E1/ M240G/M240N

Inspect front sight (1) for looseness or any damage (bends).

Sight is loose or bent.

1BL0027

NOTE

Some heat distortion, charring, and cracks may be observed on the outer non-metallic portion of the heatshield and these are not cause for replacement unless they cause edges that can cut or enough plastic is displaced so as to allow contact with metal portions.

c. Barrel Assembly (M240B/ M240D/

M240G/M240N)

Inspect carrying handle assembly (1) for bent, broken, or missing parts. Assure heatshield (2) is present, remains retained on barrel assembly, and is not bent, broken or missing parts (M240B only).

Carrying handle or heatshield (M240B) is broken or missing. Heatshield cannot be retained on barrel (M240B).

M240 Parts
1BL0028

a. Buffer Assembly

Check for burrs or rough edges on mating grooves and flanges. Notify direct support maintenance if burred or rough. Check to make sure that back plate latch (1) locks buffer assembly securely to receiver assembly when installed. Make sure buffer plug (2) sticks out through back plate (3) and is flush or higher than the protrusion (5) below it. Make sure there is no rattling sound when buffer is shook or that the plug cannot rotate by finger pressure. Check for imprint or rear of operating rod on the buffer housing. Make sure machine plug (4) is tight.

Latch will not hold buffer assembly in receiver. Washers in buffer housing rattle. Buffer plug is not flush or above protrusion. Plug can be rotated with finger pressure.

M240e1 Buffer Housing And Plug

1BL0029

1BL0029

b. Hydraulic Buffer Assembly (M240B/ M240N)

Check for burrs or rough edges on mating grooves and flanges. Notify direct support maintenance if burred or rough. Check to make sure that back plate latch (1) locks buffer assembly securely to receiver assembly when installed. Check buffer for leaks. Check buffer for looseness in backplate.

Latch will not hold buffer assembly in receiver; buffer is loose in backplate, or leaking is found. Buffer shaft bent, cracked or mushroomed.

Table Unit
Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

(cont)

c. Buffer Assembly (M240D/ M240E1)

Check for burrs or rough edges on mating grooves and flanges. Notify direct support maintenance if burred or rough. Check to make sure that back plate latch (1) locks buffer assembly securely to receiver assembly when installed. Make sure buffer plug sticks out through back plate and is flush or higher than the protrusion below it. Make sure there is no rattling sound when buffer is shook or that the plug cannot rotate by finger pressure. Check for imprint or rear of operating rod on the buffer housing. Make sure machine plug is tight. Check trigger assembly (1) for movement. Check for proper spring tension.

Latch will not hold buffer assembly in receiver. Washers in buffer housing rattle. Buffer plug is not flush or above protrusion. Plug can be rotated with finger pressure. Weapon functions with safety at "S".

Trigger Housing Assembly For M240
1BL0031

Buttstock and

Buffer

Assembly

(M240B/

M240G/M240N)

Inspect buttstock (1) for cracks. Check to make sure backplate latch (2) locks buttstock securely to receiver assembly (3) when installed.

Ensure buffer block (4) is firmly attached to buttstock (1).

Latch will not hold buttstock in receiver assembly.

Buffer is loose, notify direct support maintenance.

Driving Spring Rod Assembly

Check spring (1) for broken strands. Replace spring rod assembly (2) if two strands are broken on the same coil or three or more strands are broken, regardless of location, on the same spring. Make sure driving spring rod assembly (3) is not bent.

Two strands are broken on the same coil or three or more strands are broken in any location. Rod bent so as not to collapse and expand freely; or catches on spring.

M240 Operating Rod Assembly Labels

1BL0033

1BL0033

Bolt and Operating Rod Assembly

Remove pin (1) and bolt assembly (2) from operating rod assembly (3) (WP 0013 00). Check firing pin (4) to make sure it is straight and has a smooth, round tip. Make sure ball end is installed between spring pin (5) and bottom of groove. Clean and remove carbon, if necessary. Visually inspect bolt for cracks. Check roller (6) for spring action and freedom of movement. Reassemble pin (1) and bolt assembly (2) to operating rod assembly (3).

Firing pin is broken or distorted. Bolt is cracked; roller does rotate freely. Spring does not return roller to upright position when depressed.

NOTE

Always turn in both barrels with the weapon if turned in to direct support with bolt assembly problems.

Trigger Housing Assembly For M240

1BL0034

Trigger Spring Pin and Cover Hinge Spring Pin

Inspect trigger spring pin (1) and cover hinge spring pin (2) for bends, and for broken or missing springs (3 and 4). Replace pins (1 and 2) if they are bent or if the spring pins are missing.

Any part is broken, missing, or damaged.

Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

Trigger Housing Assembly

Inspect tripping lever (1) and sear (2) for burrs on edges or shoulders. Notify direct support maintenance if burred. Push back on tripping lever to raise sear. Place safety (3) to safe "S". Pull trigger. Sear should not drop down far enough to lock in downward position. Place safety to fire "F". Pull trigger. Sear should drop down and lock in the downward position. Check for cracked grips. Check sear spring (7) to make sure the leg of the sear spring (7) is behind trigger pin (8) and not between the trigger and the pin.

a. M240/M240C only: Make sure charger cable guide (4) is securely attached to trigger housing (5).

Weapon functions with safety on "S". Sear spring missing, bent, broken, or not properly installed. Grips are missing.

Cable guide broken or missing.

M240b Trigger Assembly
1BL0036

M240D/M240E1: Check that trigger actuating assembly (1) is securely attached to trigger housing assembly (2). Check that trigger actuating assembly is not damaged.

Broken, damaged, or missing parts.

Trigger Maxim Machine Gun

M240B/M240G/M240N: Check grip assembly (1) for loose or missing grip screws (2). Check trigger guard (3) for bends or cracks.

Grip screw(s) are missing. Trigger guard is missing or is bent such as it causes interference with firing.

Smontaggio Bernardelli
1BL0038

Trigger Actuating

Assembly

(M240D/M240E1)

Check for proper spring action. Repair or replace unserviceable authorized components (WP 0017 00).

Broken, damaged, weak or missing parts.

Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

9

Cover Assembly

Pivot feed lever (1) back and forth to make sure the feed mechanism operates smoothly without binding. Push in on cover latches (2) to make sure retaining clip (3) is not weak or missing and cover latches (2) do not bind in the housing. Push down on cartridge guides (4) and feed pawls (5) to make sure springs (6 and 7) are not weak or missing. Inspect accessory mounting rail (8) for nicks or burrs (M240B/M240D/ M240E1/M240G/M240N).

Broken or missing parts, or any part is damaged to extent it may cause malfunction. Mounting rail will not accept optional sighting equipment (M240B/M240D/ M240E1/M240G/ M240N).

Mk19 Grenade Launcher Field Stripped
M240/M240B/M240D/M240E1/M240G/M240N
M240n Machine Gun

TOP VIEW M240B/M240D/M240E1/M240G/M240N

1BL0040

Feed Tray

Check feed tray (1) for cracks, deformation, broken welds, and loose rivets.

Cracked, deformed; broken welds or loose rivets.

M240d Sight Components

M240/M240B/M240D/M240E1/M240G

M240C

M240/M240B/M240D/M240E1/M240G

M240C

Receiver Assembly (M240/M240C)

Check charger cable (1) for broken strands and for torn or missing rubber handle (2). Make sure charger slide pin (3) and spring plate cotter pins (4) are present and serviceable. Pull charger cable (1) to rear and slowly allow it to return to the forward position to make sure slide (5) does not bind in receiver extension spring (6) is not weak. Push in on barrel locking latch (7) to make sure the latch spring is not missing or weak. Check receiver for loose or missing rivets. Check to make sure access cover (8) is in place in the bottom of the receiver (WP 0018 00). Clean receiver if necessary (TM 9-1005-313-10).

BL0041 Broken, weak, or missing parts. Any binding occurs. Any rivets are loose or missing.

M240b Machine Buffer Assembly
1BL0043
Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

Receiver Assembly (M240B/M240D/ M240E1/M240G/ M240N)

Check that rear sight assembly (1) is securely mounted to receiver assembly (2) and operates properly. Check that manual control handle (3) operates slide (4) properly. Make sure spring plate cotter pins (5) are present and serviceable (M240D/ M240E1 only). Pull manual control handle to rear and slowly allow it to return to the forward position to make sure slide (4) does not bind in receiver and extension spring (6) (M240D/M240E1) is not weak. Check for damaged or missing ejection port cover, spring and pin (M240B only). Push in on barrel locking latch (7) to make sure the latch spring is not missing or weak. Check receiver for loose or missing rivets. Check to make sure access cover (8) is in place in the bottom of the receiver (WP 0018 00). Repair or replace all damaged authorized parts (WP 0018 00).

Broken, weak, or missing parts. Any binding occurs. Any rivets are loose or missing. Damaged or missing ejection port cover should be repaired/replaced as soon as possible, however, it does cause the weapon to be NMC (M240B only).

M240b Machine Gun Sections

1BL0044

1BL0044

Receiver Assembly with Forward Rail (M240B only)

Check assembly for cracks; broken, loose, or missing parts.

Screws (1) loose or missing; body (2) cracked or broken; rails cracked or broken, or won't accept optional devices.

Picture Broken M240b
1BL0333

Bipod Assembly (M240B/M240G)

Check bipod legs (1) for cracks, twisted or incomplete assembly.

Cracked, twisted or missing parts.

Machine Gun

1BL0045

Machine Gun

Assemble weapon (TM 9-1005-313-10). Be sure parts are installed correctly and are in good working condition. When installing the barrel assembly (1) in the receiver (2), rotate the barrel release latch/carrying handle assembly (3) clockwise until it stops. Unlock and rotate counter-clockwise completely. While rotating clockwise, count the number of clicks until it stops. Fewer than 2 or more than 7 clicks indicate defective parts. Notify direct support maintenance. (Make this check with spare barrel also.) Check weapon functioning with belted dummy ammo (TM 9-1005-31310). If weapon does not function properly and the cause cannot be determined by using the troubleshooting procedures (WP 0004 00), notify direct support maintenance.

Initial gaging is required 1 year from receipt of new or overhauled weapons. Ensure that machine gun has been inspected/ gaged within the last year. For Army Reserve and National Guard weapons, the period is 2 years unless inspection shows need for gaging more often due to usage or other factors.

Fewer than 2 or more than 7 clicks when installing barrel assy.

Assigned/spare barrels are not headspaced and/or required tagging is missing. Gaging has not been performed or no record of gaging is available.

1BL0045

M240C

1BL0046

M240C

1BL0046

Table 1. UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (cont)

Item

Interval

Man-Hours

Item to be Checked

Procedures

Not Fully Mission Capable if:

Was this article helpful?

0 0

Responses

  • phillipp
    How often are weapons gaged by direct support?
    3 years ago

Post a comment