Yamaha K-31 Service Manual download pdf (Page 29)

32 and 33

b) Bolt

Mq. 11 Mq. 31

Replace the Extractor

Slide the locking sleeve, lugs forward, over

the cylinder

Replace the cocking piece and slide it into

the firing groove in the bolt plug

Replace the firing pin spring over the

cocking piece and compress it and hold

Replace the firing pin, release the spring

Pull and turn the cocking piece so the sear

rests between the two slots in the bolt plug

Assemble and tighten the firing mechanism

assembly to the cylinder/sleeve assembly

Grasp the bolt in the left hand

Turn the locking sleeve until the end of the

helical slot aligns with the cam follower pin

slot on the cylinder and that these align with

the cam follower shaft slot in the bolt plug.

Replace the cam follower shaft by first

placing the cam follower pin in the forward

part of the helical slot as well as the cam

follower pin slot in the cylinder. Place the

small p in in the bolt plug slot.

Pull the cam follower shaft all the way to the

rear causing the locking sleeve to turn left to

the point the cam follower pin falls into the

aft pocket of the helical slot.

Place the Cocking Piece Sear into the safety

slot.

Replace the extractor

Slide the locking sleeve with the lugs in front over

the cylinder

Replace the cocking piece and slide it into the firing

groove in the bolt plug

Replace the firing pin spring over the cocking piece

and compress it and hold

Replace the firing pin, release the spring

Pull and turn the cocking piece so the sear rests

between the two slots in the bolt plug

With the cylinder/locking sleeve assembly in the

left hand, hold the locking lugs with the thumb and

middle finger. Align the ejector slots in the locking

sleeve and the cylinder and hold them aligned with

the tip of the index finger.

Slide the sleeve/cylinder assembly into the firing

mechanism assembly until it bottoms, with the cam

follower plate slot in the bolt plug turned to the left.

Turn the sleeve/cylinder assembly a quarter turn

until the rear pocket of the helical slot in the locking

sleeve aligns with the cam follower plate slot in the

bolt plug.

Replace the cam follower plate by inserting the rear

end of the plate in the cam follower plate slot in the

bolt plug; Slide the cam follower plate back until it

bottoms and turn the bolt to the left until cam

follower pin can slide into the pocket on the aft end

of the helical slot in the locking sleeve.

Place the Cocking Piece Sear in the safety slot in

the bolt plug.

c) Replace the bolt

d) Replace the Magazine

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Yamaha K-31 Service Manual Page 29

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