TM 9-2350-230-12
Table 5-1. Troubleshooting-Continued 6,
Malfunction
Probable causes
Corrective action
7.62MM MACHINE GUN
Continued
34. Failure to lock
a. Breechblock assembly incorrectly
a. Install properly.
installed.
b. Defective breechblock roller and/or
b. Replace breechblock assembly.
shaft.
c. Barrel Installed incorrectly. Not
c. Install barrel properly.
engaged in barrel extension or
upside down.
d. Defective lever actuator (breech -
d. Replace barrel extension assembly.
closing) roller.
35. Failure to fire
a. Fire control selector not in CQAX
a. Turn to COAX position (Fig. 2-19).
position.
b. Defective barrel extension assembly
b. Replace.
c. Defective firing pin
c. Replace breechblock assembly.
d Defective firing pin extension
Replace barrel extension assembly.
e. Loose connector
e. Inspect electrical harness.
f. Safety in ('S" position
f. Slide safety to ("F'' position.
g. Defective ammunition
g. Remove faulty round.
36. Failure to unlock
Defective lever actuator (breech -
Replace barrel extension assembly.
opening) roller.
37. Failure to extract
a. Defective cartridge case (rim ruptured)
a. Remove spent case (Fig. 3-6).
b. Defective extractor
b. Replace barrel extension assembly.
c. Defective cartridge rammer
c. Replace barrel extension assembly.
d. Defective extractor spring
d. Replace barrel extension assembly.
e. Pitted chamber
e. Replace barrel assembly.
f. Short recoil
f. Investigate for binding parts, clean
and lubricate (LO 9-2350-230-12).
38. Failure to eject
Defective barrel extension assembly
Replace.
39. Failure to cock
Defective barrel extension assembly
Replace.
40. Uncontrolled automatic fire
a. Defective barrel extension (sear
a. Replace.
notches).
b. Defective receiver tabs
b. Notify organizational maintenance.
41. Improper rate control
Missing rate control pawl
Replace barrel extension assembly.
42. Failure to load
a. Ammunition placed in feedway
a. Reposition ammunition belt.
incorrectly.
b. Link from previous belt in feedway
b Remove expended (last) link.
CAL. .50 MACHINE GUN, M2 (Table 5-10)
43. Failure to feed
Defective ammunition belt
Remove damaged link or reposition
rounds.
44. Failure to chamber
Damaged round, obstruction in T-slot,
Remove round and clean T-slot.
or ruptured case.
45. Failure to lock
a. Broken or damaged parts
a. Examine for broken parts, battered
breech lock or rough breech lock
cam.
5-5
