ARMY TM 5-5420-212-23
MARINE CORPS TM 08676A-23/2
WARNING
Cleaning solvent is toxic and flammable. Use only in well ventilated area and avoid prolonged
breathing of fumes. Keep solvent away from flames. Do not use in excessive amounts and avoid
skin contact.
a. Inspection
(1) Remove any dirt and grease from plunger assembly.
(2) Check screws (1) are tight.
(3) Check plunger (2) for burrs and damaged edges.
(4) Check operation of plunger if plunger is seized. If operation is weak or plunger does not return to extended
position, the spring is either weak or broken.
(5) Inspect plunger housing (3) for damage.
b. Removal
(1) Unscrew and remove two screws (1) and washers (4) securing plunger housing (3) to shoot bolt housing, then
remove plunger housing.
(2) Unscrew and remove plunger (2) together with guide (5) from plunger housing (3).
(3) Remove washer (6) and spring (7) from plunger housing (3).
c. Service/Repair
(1) Remove grease from plunger housing (3).
(2) Clean all components using cleaning solvent, then wipe dry.
(3) Inspect all components for cracks, breaks, and burrs.
(4) Remove burrs from edges of housing.
(5) Replace components as necessary.
(6) Pack plunger housing with grease (GAA) until it is half full.
d. Installation
(1) Insert washer (6) and spring (7) into plunger housing (3).
(2) Insert plunger (2) into guide (5).
(3) Screw guide and plunger into housing (3) and tighten guide until flush with surface of housing, with long edge of
plunger at 90o to centerline of screw holes (1).
(4) Ensure that plunger (2), fully depressed, protrudes above housing (3) no less than 1/4 in (6.4 mm) and no more
than 9/32 in (7 mm)
(5) Center punch thread at 120o to lock.
(6) Coat mating surface of plunger housing (3) with jointing compound then secure to shoot bolt housing with two
screws (1) and washers (4).
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