Note

Steps a, b, and c must be completed for each microswitch.

a. Cycle drive assembly until the switch actuator arm roller (67) reaches the cutout on the cam as shown. At this point you should hear an audible click from the microswitch. If there is an audible click, proceed to step c.

b. If there is no audible click in step a, adjust the actuator arm. Bend the arm slightly near the switch actuator arm roller (67) to get the audible click noted in step a.

c. Cycle the drive assembly until the actuator arm roller (67) reaches the other side of the cam cutout. At this point the actuator arm resets the microswitch and an audible click is heard. Repeat step b if no click is heard.

M242 25mm Micro Switch Adjustment

ASSEMBLY - Continued

20. INSTALL FEED SHAFT STOPS (WP 0043 00).

21. PERFORM FEEDER DRIVE ASSEMBLY MANUAL CYCLE AND ELECTRICAL CHECK (WP 0018 00).

22. INSTALL ELECTRICAL FEED SELECT SOLENOID FOR STANDARD GUN (WP 0045 00) OR INSTALL FEED SELECT SOLENOID WIRING HARNESS (WP 0047 00) AND FEED SELECT SOLENOID BODY (WP 0046 00).

23. INSTALL UPPER EJECT GUIDE (WP 0042 00).

24. INSTALL STEPPED SPACERS (WP 0041 00).

25. INSTALL FEEDER STANDOFF (WP 0040 00).

26. INSTALL UPPER AND LOWER FEED SPROCKET ASSEMBLIES (WP 0039 00).

27. INSTALL FEEDER ASSEMBLY ROTOR (WP 0036 00).

28. INSTALL FORWARD FEED ASSEMBLY (WP 0034 00).

29. INSTALL EJECTION CHUTE (WP 0032 00).

30. INSTALL REAR LINK STRIPPERS (WP 0031 00).

31. INSTALL LINK SHIELD (WP 0029 00).

32. INSTALL LINK BRIDGES FOR STANDARD FEEDER (WP 0027 00) OR LINK COVER ASSEMBLIES FOR ENHANCED FEEDER (WP 0028 00).

33. PERFORM AUTOMATIC GUN FEEDER MANUAL CYCLE CHECK (WP 0007 00). END OF WORK PACKAGE

DIRECT SUPPORT

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

REAR PLATE ASSEMBLY AND FEED PLATE ASSEMBLY DISASSEMBLY/ASSEMBLY DISASSEMBLY, CLEANING, INSPECTION, ASSEMBLY

INITIAL SETUP:

Tools and Special Tools

Goggles (item 19, WP 0085 00) Rubber gloves (item 18, WP 0085 00) Small arms repairman tool kit (item 43,

WP 0085 00) Small arms shop set (item 35, WP 0085 00) Torque wrench, 0-300 in.-lb (item 50, WP 0085 00)

Materials/Parts

Acid brush (item 4, WP 0116 00)

Adhesive (item 2, WP 0116 00)

Dry cleaning solvent (item 27, WP 0116 00)

Flanged sleeve bushing (2) (12524197)

Grease (item 11, WP 0116 00)

Preformed packing (2) (AS3551-217)

Rivets (6) (MS20427M4-7)

Rivets (7) (MS20427M4-10)

Rivets (8) (MS20427M4-12)

Rivet (MS20427M4-14)

Sealing compound primer (item 20,

WP 0116 00) Self-locking nut (12524617-1) Zinc chromate primer (item 19, WP 0116 00)

References

WP 0007 00 WP 0081 00

Equipment Conditions

WP 0027 00 Link bridges removed

(Standard Feeder only) WP 0028 00 Link cover assemblies removed

(Enhanced Feeder only) WP 0029 00 Link shield removed WP 0031 00 Rear link strippers removed WP 0032 00 Ejection chute removed WP 0034 00 Forward feed assembly removed WP 0036 00 Feeder assembly rotor removed WP 0039 00 Upper and lower feed sprocket assemblies removed WP 0040 00 Feeder standoff removed WP 0041 00 Stepped spacers removed WP 0042 00 Upper eject guide removed WP 0073 00 Rear plate assembly removed

Special Environmental Conditions

Well-ventilated area required when using dry cleaning solvent.

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