M242 25mm Machine

Repair bolt and carrier assembly by replacing defective parts (WP 0055 00)._

BREECH ASSEMBLY

BREECH ASSEMBLY

M242 Bolt And Track
AUTO GUN RECEIVER

Replace breech assembly (WP GG5i GG)._

FIRING PIN SLEEVE KEEPER

CAM-PIN ASSEMBLY

CARRIER ASSEMBLY

Assemble bolt and carrier assembly (WP 0055 00). Assemble bolt and track assembly (WP 0054 00). Install bolt and track assembly (WP 0053 00). Install barrel assembly (WP 0023 00). Place a dummy round in face of breech bolt and perform auto gun receiver manual cycle check (WP 0008 00). Perform automatic gun feeder manual cycle check (WP 0007 00)._

FIRING PIN SLEEVE KEEPER

CAM-PIN ASSEMBLY

CARRIER ASSEMBLY

M60 Bolt Actuator

FIRING PIN ASSEMBLY

FIRING PIN SLEEVE

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FIRING PIN ASSEMBLY

FIRING PIN SLEEVE

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END OF WORK PACKAGE

UNIT

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

GUN CYCLES BUT WILL NOT FIRE

INITIAL SETUP:

TooIs and Special Tools

Artillery and turret mechanic's tool kit

(item 41, WP 0085 00) Turret mechanic's supplemental tool kit (item 44, WP 0085 00)

Equipment Conditions

WP 0026 00 Automatic gun feeder removed WP 0053 00 Bolt and track assembly removed WP 0054 00 Bolt and carrier assembly removed

TRACK ASSEMBLY

TRACK ASSEMBLY

M242 Bolt And Track
BOLT AND CARRIER ASSEMBLY

Rotate safety handle to FIRE and back to SAFE. Does safety pawl move up and down when handle is moved?

NO ^

Repair track by replacing safety actuator and/or safety pawl (WP 0056 00).

w

YES

SAFETY PAWL

TRACK

SAFETY ACTUATOR

SAFETY PAWL

TRACK

Safety Pawl
SAFETY HANDLE

GUN CYCLES BUT WILL NOT FIRE - Continued

Ensure breech bolt is in forward dwell position (uncocked) and check firing pin assembly protrusion. Is firing pin protrusion between 0.059 in. and 0.098 in. (1.5 mm and 2.5 mm)?_

Repair bolt and carrier assembly by replacing firing pin assembly (WP 0055 00)._

BOLT FACE

FIRING PIN ASSEMBLY

FIRING PIN ASSEMBLY

1005 454 0396
FIRING PIN PROTRUSION 0.059 IN.-0.098 IN. (1.5 MM-2.5MM)

CAM-PIN ASSEMBLY (DWELL POSITION (UNCOCKED)) B0LT AND CARRIER

ASSEMBLY

BREECH BOLT

M242 Bolt And Track

CARRIER ASSEMBLY

BREECH BOLT

CARRIER ASSEMBLY

Disassemble bolt and carrier assembly (WP 0055 00) and check parts for cracks, breaks, chips, and missing parts. Check firing pin assembly for burnt or broken firing pin tip and broken spring. Do these conditions exist?

Repair bolt and carrier by replacing defective parts (WP 0055 00).

FIRING PIN SLEEVE KEEPER

CAM-PIN ASSEMBLY

CARRIER ASSEMBLY

FIRING PIN SLEEVE KEEPER

CAM-PIN ASSEMBLY

CARRIER ASSEMBLY

Firing Pin Pawl

FIRING PIN ASSEMBLY

FIRING PIN

SLEEVE

FIRING PIN ASSEMBLY

FIRING PIN

SLEEVE

Check firing pin pawl and safety pawl for chips, breaks, and worn or missing parts. Do these conditions exist?

Repair track by replacing firing pin pawl, safety pawl, or helical springs (WP 0056 00)._

HELICAL SPRINGS'

SAFETY PAWL

FIRING PIN PAWL

SAFETY PAWL

FIRING PIN PAWL

HELICAL SPRINGS'

Safety Pawl
TRACK

Press firing pin pawl.

Repair track by re

Does firing pin pawl

NO ^

placing firing pin pawl,

return to original

w

safety pawl, or helical

position?

springs (WP 0056 00).

YES

Assemble bolt and carrier assembly (WP 0055 00). Assemble bolt and track assembly (WP 0054 00). Install bolt and track assembly (WP 0053 00). Perform auto gun receiver manual cycle check (WP 0008 00).

UNIT

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

GUN FIRES WITH SAFETY ON

INITIAL SETUP:

TooIs and Special Tools

Artillery and turret mechanic's tool kit

(item 41, WP 0085 00) Turret mechanic's supplemental tool kit (item 44, WP 0085 00)

Equipment Conditions

WP 0023 00 Barrel assembly removed WP 0026 00 Automatic gun feeder removed WP 0053 00 Bolt and track assembly removed WP 0054 00 Bolt and carrier assembly removed

SAFETY LINK

SAFETY PAWL FIRING PIN PAWL

SAFETY LINK

SAFETY PAWL FIRING PIN PAWL

Safety Pawl

SLIDER

MASTER LINK

CHAIN

SLIDER

MASTER LINK

CHAIN

TRACK ASSEMBLY

Safety Pawl
FIRING PIN TANG
Pawl 25mm Feeder
FIRING PIN ASSEMBLY

Visually check for

excessive wear, chips,

and breaks

on top of

YES ^

safety pawl. Is safety

w

pawl defective?

NO

Repair track by replacing defective safety pawl (WP 0056 00)._

Repair track by replacing defective safety pawl (WP 0056 00)._

GUN FIRES WITH SAFETY ON - Continued

How Linkless Feed System WorksSafety Pawl
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40v Firing Pin Assembly

END OF WORK PACKAGE

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Responses

  • Dora
    How to CLEAR, REMOVE, DISASSEMBLE, ASSEMBLE AND INSTALL AN M242 25MM GUN?
    8 years ago
  • ilse
    How do firing pins work?
    7 years ago
  • michael
    How to cycle 25MM gun?
    3 years ago
  • joseph ng
    How to assemble disassemble 25mm bushmaster?
    1 year ago
  • sandra
    How does a 25mm chain gun work?
    5 months ago

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