PK Series Manual (English, 2005) - Forgotten Weapons

Listed in table 7-1 are the established “Stoppages During Firing and Corrective Actions”
procedures as outlined in the Yugoslavian (U) Manual for the M84, 7.62-mm
Machinegun, dated 1989.
When handled, maintained, and stored properly, the machinegun is a safe weapon to
use and functions without interruption.
After prolonged operation, owing to the wear or breakage of individual components,
presence of dirt, use of faulty ammunition, or negligent handling, defects may appear
that cause stoppage. In order to prevent stoppage, soldiers and officers must strictly
observe the rules on handling, disassembly, cleaning, assembly, and inspection of
weapons; prior to firing inspect the ammunition belt and ammunition; the machinegun
should not be loaded with faulty or dirty ammunition; prior to loading, wipe the
ammunition with a dry rag; during firing, while running or pausing in combat, take good
care of the weapon; inspect, clean and lubricate the machinegun regularly, especially its
movable components, the bore, the gas block, the gas regulator, the gas cylinder,
the receiver, the feed mechanism and ammunition belt; prior to firing regularly clean the
barrel and lightly lubricate the receiver and the bolt assembly; during uninterrupted firing
do not exceed the limit of 250 rounds. If stoppage occurs, wait up to 5 seconds, pull the
bolt rearward, eject the stuck round, and continue to fire. If stoppage reoccurs, empty
the machinegun, establish the cause of stoppage, and clear it if possible. If stoppage
cannot be cleared, send the machinegun for repair.
Table 7-1. Machinegun Troubleshooting
Malfunctions and their Reasons for
Corrective
Characteristics
Malfunctions
Action
Bolt fails to move to rear • Improper feeding, the • Disengage safety and pull
and extract cartridge from 1st cartridge did not back charging handle.
belt link; cartridge jams reach cartridge stop. • Press receiver cover latch
under bolt head.
• Wpn is on Safe.
and open receiver cover.
• If cover does not open,
use tools to feed the first
round properly.
Bolt fails to move to rear • Broken or weak driving • Pull bolt rearward and
and push the cartridge spring, lubricant build-up release it suddenly.
out of the feed. The or dirt in receiver • Clear machinegun of
cartridge jams between assembly.
ammunition.
the bolt and the barrel or
its tip hits against the
breech.
• Worn bolt face.
•
•
Clean receiver and bolt.
If driving spring is broken,
weak or the bolt face is
worn, send wpn to the
armorer for repair.
UNCLASSIFIED
VII - 6