Yamaha K-31 Service Manual download pdf (Page 37)

46 (cont), 47

34 If a major inspection is required, contact the responsible officers. A major inspection should take

place at least one time during short time active duty and once every two or three weeks during

prolonged periods of active duty. This inspection is composed of the following elements:

a) Remove all cartridges, the bolt and the magazine.

b) Degrease the barrel bore and the chamber (clean if necessary)

c) Perform a major disassembly, remove the stock if necessary

d) Barrel inspection:

-Place the bore mirror in the loading slot; inspect the rifling and the chamber

e) Inspect the sights: ensure the front sight housing is fixed in place, that the elevation slide

moves freely, check the condition of the slide stop and the condition of the rear sight

notch,

f) Inspect the movement in the trigger mechanism and the bolt stop.

g) Inspect the stock and the hand guard (for cracks)

h) Bolt inspection:

Disassemble the bolt into 4 parts, the firing mechanism will not be disassembled and the

extractor will stay fixed to the cylinder.

-Cylinder: firing pin channel and extractor slot are intact,

-Locking sleeve: no visible cracks, inspect free movement of the sleeve over the cylinder,

-Firing mechanism: point of the firing pin is in good condition, check the wear on the

cocking piece sear, verify that there are no cracks in the bolt plug,

-The cam follower plate: the shooter must inspect the cam follower pin for cracks at the

range as well as during rifle cleaning and inspection. If there is a doubt as to whether the

cam follower pin is fractured, contact a gunsmith (if not on active duty, contact the arms

inspector or the arsenal,

i) Magazine: check that the spring is in the proper position, check magazine follower plate

for free movement.

j) Reassemble the rifle without the magazine:

-Inspect the sears, weapon shouldered

-Inspect the firing mechanism by moving the bolt,

k) Inspect the bayonet: Fix it to the barrel and to the lug and check for movement (slight

play is allowed)

l) Inspect the screws and the barrel bands (on the Mq. 11 check that the mounting sleeve is

well inserted into the stock and the hand guard),

m) Check that the serial number of the weapon, the bolt, the magazine, and the bayonet are

the same,

n) Check that the weapon inspection information has been recorded in the weapon service

log.

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Yamaha K-31 Service Manual Page 37