Yamaha K-31 Service Manual download pdf (Page 26)

III. Disassembly and Reassembly

1. Weapon Disassembly

4 Before disassembly it is important to check for and remove all cartridges by inspecting the

magazine and chamber.

The weapon should be disassembled no more than is necessary for proper cleaning. To avoid

dirtying the rifle parts all parts should be placed on a clean surface.

5 Disassemble the Rifle per the following:

a) Remove the Magazine (disassemble the magazine, if required, per section 9)

b) Remove the bolt

c) Disassemble the bolt

Mq.11

Mq. 31

Grasp the bolt in the left hand

Place the cocking piece sear between the

two slots in the bolt plug

With the left hand, turn the locking

sleeve to the right; simultaneously push

and remove the cam follower piece.

Detain the firing pin spring by placing

the cocking piece sear in the firing slot

in the bolt plug.

Remove the firing mechanism by

unscrewing the cylinder from the bolt

plug.

Separate the locking sleeve from the

cylinder.

With both thumbs, remove the extractor

by rotating it to the right; if necessary,

support the left part of the claw against

as stop and tap lightly on the cylinder to

free the extractor.

Grasp the bolt in the left hand; place the

cocking piece sear between the two slots on

the bolt plug.

Remove the cam follower pin from the helical

slot in the locking sleeve; then remove the

cam follower by pushing forward through the

slot in the bolt plug.

Grasp the locking lugs with the thumb and the

middle finger.

Hold the cylinder with the index finger next to

the extractor.

Turn the bolt plug a quarter turn.

Separate the firing mechanism from the

locking sleeve and the cylinder.

Separate the cylinder from the locking sleeve

Remove the 3mm extractor with a screwdriver

by pushing it forward. (Avoid removing the

extractor if possible as removal may break or

weaken the spring)

Retain the firing pin spring by placing the

cocking piece sear in the firing slot in the bolt

plug.

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Yamaha K-31 Service Manual Page 26

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