Warning

If weapon has been determined to be contaminated (radioactive), all warnings at the beginning of WP 0022 00 shall be in effect.

Auto gun receiver is too heavy for one person to lift. Get help to lift or carry automatic gun receiver.

Do not wear jewelry when working on the gun. Serious injury or death may occur.

Keep your fingers away from moving parts of gun. Serious injury or death may occur.

REMOVAL

REMOVE SEAR ASSEMBLY.

a. Pull sear sleeve-pivot (1) from auto gun receiver (2).

b. Lift sear assembly (3) out of auto gun receiver (2).

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INSPECTION

INSPECT SEAR ASSEMBLY.

a. Visually inspect sear assembly (1) for cracks and loose or broken spring tension washers (2). If any of these conditions are found, replace sear assembly.

b. Using feeler gage, inspect spring tension washers (2) to assure they do not freely slide more than 0.04 in. (1 mm). Spring tension washers may rotate, but maximum gap between any two spring tension washers is 0.04 in. (1 mm). Use feeler gage. If measurement is not met, replace spring tension washers.

c. Visually inspect spring pin (3) for breaks or bends. If either of these conditions are found, replace spring pin.

LUBRICATION

LUBRICATE SEAR ASSEMBLY.

Using acid brush, apply a light coat of grease to pivot hole (1) and notched blade (2) of sear assembly

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INSTALLATION

1. INSTALL SEAR ASSEMBLY.

a. Place sear assembly (1) in auto gun receiver (2) with pivot hole (3) down.

Straight Drive Shaft M242

INSTALLATION - Continued b. While holding sear assembly (1) in position, install sear sleeve-pivot (4). Press in narrow end of sear sleeve-pivot (4) until seated.

2. INSTALL COVER ASSEMBLY AND SEAR RETRACTOR ASSEMBLY (WP 0063 00).

3. INSTALL STRAIGHT DRIVE SHAFT (WP 0060 00).

4. INSTALL BOLT AND TRACK ASSEMBLY (WP 0053 00).

5. PERFORM AUTO GUN RECEIVER MANUAL CYCLE CHECK (WP 0008 00).

6. INSTALL AUTOMATIC GUN FEEDER (WP 0026 00). END OF WORK PACKAGE

Bevfitchett M242 25mm

UNIT

M242 25-MM AUTOMATIC GUN (NSN 1005-01-086-1400) M242 25-MM ENHANCED AUTOMATIC GUN (NSN 1005-01-454-0396)

SEAR ASSEMBLY DISASSEMBLY/ASSEMBLY DISASSEMBLY, CLEANING, INSPECTION, ASSEMBLY

INITIAL SETUP:

Tools and Special Tools

Artillery and turret mechanic's tool kit

(item 41, WP 0085 00) Common #2 shop equipment (item 34,

WP 0085 00) Goggles (item 19, WP 0085 00) Rubber gloves (item 18, WP 0085 00)

Materials/Parts

Acid brush (item 4, WP 0116 00) Dry cleaning solvent (item 27,

WP 0116 00) Grease (item 11, WP 0116 00) Wiping rags (item 21, WP 0116 00)

Personnel Required

Equipment Conditions

WP 0026 00 Automatic gun feeder removed WP 0053 00 Bolt and track assembly removed WP 0060 00 Straight drive shaft removed WP 0063 00 Cover assembly and sear retractor assembly removed WP 0065 00 Sear removed

Special Environmental Conditions

Well-ventilated area required when using dry cleaning solvent.

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