Control Cam Installation In The M242

Do not drop lockwire pieces into gun. Wire can get between moving parts and damage gun.

1. INSPECT AUTOMATIC GUN FEEDER.

a. Visually inspect automatic gun feeder (1) for cracked, bent, or broken parts. If any of these conditions exist, replace those defective parts.

b. Visually inspect automatic gun feeder (1) for loose or missing hardware. Tighten or replace hardware as needed.

Worm Harness Components

INSPECTION - Continued c. Visually inspect link strippers (2), cam bushing screw (3), ejection chute (4), cartridge guide (5), worm shaft nut (6), and wire harness (7) for installed lockwire. Replace lockwire if missing.

d. Standard Feeder Only: Visually check link bridge (8) for lockwire. Replace lockwire if missing.

e. Enhanced Feeder Only: Visually inspect cover assembly (9) for loose or missing rivets. If loose or missing rivets are found, replace cover assembly.

M242 FeederEjection Shute 25mm FeederM242 Bolt And Track
standard feeder

INSPECTION - Continued f. Marine Corps Only: Inspect rear plate assembly (10) for damaged or missing feed chute latch pins (11). If feed chute latch pins are damaged or missing, refer to WP 0025 00.

M242 Bolt And Track

2. INSPECT RECEIVER ASSEMBLY.

a. Inspect receiver assembly (12) for cracked, broken, or worn parts. If any of these conditions are found, replace defective parts.

b. Inspect receiver assembly (12) for nicks and dings. Deburr all nicks and dings to remove sharp edges.

c. Inspect receiver housing assembly (13) for cracks or damage along the guide rails (14). Cracks shall not exceed 6.0 inches (152.4 mm) in length per rail and have a depth no greater than 0.5 inch (12.7 mm) from the top of the receiver. Damaged or deformed guide rails may be repaired by removing damaged material up to 6 inches in length and up to 0.5 inch in depth. If the receiver housing is damaged beyond these limits, replace the gun.

M242 Bolt And Track

INSTALLATION

1. VERIFY AUTO GUN RECEIVER IS IN SEAR POSITION.

a. Attempt to rotate straight drive shaft (1) in both directions. Bolt and carrier assembly (2) should remain locked with carrier on rear track (3).

b. If straight drive shaft (1) turns, continue to rotate until bolt and track assembly (4) locks in SEAR

2. LOCK AUTOMATIC GUN FEEDER IN SEAR POSITION.

a. Visually inspect bolt position indicator (5) to verify it is pointing to SEAR position.

b. If bolt position indicator (5) does not point to SEAR, press timer release rod (6) and rotate worm shaft nut (7) counterclockwise.

c. Rotate worm shaft nut (7) until automatic gun feeder (8) locks and bolt position indicator (5) points to SEAR position.

d. Press down on feeder handle latch (9) and rotate and lock feeder handle (10) upwards.

position.

25mm Gun Track And BoltAuto Sear Auto Position
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3. INSTALL AUTOMATIC GUN FEEDER.

a. Inspect 14-pin connector casings on the feeder and receiver. If bent, straighten until proper alignment can be obtained. Replace wiring harness if proper alignment cannot be achieved.

14 pin receptacle

M242 Sear Indicator
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Bevfitchett M242 25mm

b. Verify that straight drive shaft (1) is in lowered position.

c. Position automatic gun feeder (8) onto auto gun receiver guide rails (11).

d. Slide automatic gun feeder (8) forward until it rests firmly against end of auto gun receiver (12).

M242 Bolt And Track
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INSTALLATION - Continued

4. RAISE STRAIGHT DRIVE SHAFT.

Press release button (13) and fully insert drive shaft (1) into auto gun receiver (12). Pull down to ensure drive shaft is locked in place. If drive shaft handle rotates more than 1/2 in. (13 mm), send auto gun receiver to Direct Support Maintenance for repair.

M242 25mm Worm Shaft

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