Yamaha K-31 Service Manual download pdf (Page 34)

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c) If the bolt cannot be opened:

-Remove the magazine,

-Place the cocking piece sear between the safety slot and the firing slot in the bolt plug,

-Pull the bolt back by the handle with blows of the palm of the hand if required,

-Remove the bolt, disassemble and inspect all of the parts (especially the cam follower

pin),

-If no defect or damage is found reassemble and reload per step b,

d) If the bolt cannot be opened per step c:

-Safe the weapon and contact the specialist (gunsmith).

18 Loading malfunctions are caused the majority of the time by cartridges that are poorly placed in

the magazine or and foreign object in the system.

If the malfunction is caused by a case that is lodged in the chamber, extract it by closing and

opening the bolt several times; the bolt should be open by small taps to the handle of the cam

follower plate. If the case still remains in the chamber, use a cleaning rod to remove it. The cause

of this malfunction could be due to a worn or broken extractor claw or because the chamber has

become so dirty that the case remains stuck in the chamber.

19 Misfires can be caused when the bolt is not closed all the way, the firing channel is dirty or full of

grease or the point of the firing pin is broken. If these causes have been eliminated and the rifle

still does not discharge and the cartridge will not fire in another rifle, then the cartridge must be

considered a “misfire”.

20 Only the gunsmith is authorized to:

-Repair trigger mechanism malfunctions (for example, insufficient sear engagement)

-Remove foreign object, such as cleaning rods or parts of cleaning cord that are jammed in the

barrel.

All needed repairs to be performed while on duty, can only be performed by troop gunsmiths or

arsenal gunsmiths; all repairs that may be required while off duty, can only be performed by

gunsmiths authorized to repair service (military) weapons.

21 If serious damage or malfunctions occur to the weapon or ammunition, apart from those caused by

weapon discharge, and if this damage will cause or could cause an accident, carefully gather all of

the damaged parts, as well as the cartridges, and set them aside without any modification. Advise

Military Technical Services in Bern by telephone at (031/61 76 26) or by telegraph so that the

damage may be studied in place and without delay, to determine the cause.

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Yamaha K-31 Service Manual Page 34