Yamaha K-31 Service Manual download pdf (Page 36)

44 (cont), 45 and 46

29 Barrel cleaning is performed by means of a cleaning cord, after having removed the bolt and the

magazine. For Mq. 31 the locking sleeve should be re-inserted in place to ensure that the ejector

does not snag the cleaning cord. The cleaning cord is inserted through the receiver. The wire

mesh should be well greased and in good enough condition so that the wire will penetrate the

grooves of the rifling; if the wire mesh is too narrow, widen it by inserting a small piece of wood

into the cord. Two men should pull the cleaning cord exactly down the barrel axis; on each

cleaning pass, the wire mesh should pass all the way through the barrel.

After having removed all powder residues in this fashion, wrap a small thin patch around the cord

just ahead of the wire mesh, and clean the barrel again until the patch emerges clean. The barrel

is then inspected. Special attention should de paid to ensure rifling grooves are clean. After

inspection, grease the bore by greasing a thin cotton patch and wrapping it around the cord just

ahead of the wire mesh, then run the cord again through the barrel. The cleaning rod can also be

used to grease the barrel.

30 The chamber is cleaned by means of the chamber-cleaning tool. Grease the wire mesh and

loosen powder residue by inserting the tool into the chamber. Wrap a dry patch around the tool

and clean the chamber of all remaining residue. Inspect the chamber. Wrap a clean greased patch

around the tool and grease the chamber again after the inspection. If the chamber-cleaning tool is

not large enough to clean the sides of the chamber, it may be enlarged with a screwdriver.

31 Worn out wire meshes and wire mesh from the cleaning cord and cleaning tool should be

replaced. Place the new wire mesh into the buckle of the cleaning cord by placing the small sides

of the mesh against the center of the buckle and form the mesh in an ‘s’ shape through the two

pins on the buckle.

32 As a general rule, it is not necessary to perform a major disassembly except for purpose of

inspection by an arms inspector; a major disassembly may also be necessary after a long period of

bad weather. Before reassembling the weapon, grease all of the rifle parts that are not visible

outside of the stock.

3. Inspections

33 A minor inspection either by the shooter himself or by the non-commissioned officer after each

cleaning, or when the weapon has not been used during a certain period of time. Inspected are:

a) The cleanliness of the different parts, especially the bore

b) The smooth function of the bolt, the trigger, the magazine follower plate and the

magazine spring.

c) The position of the front barrel band and the sling loop barrel band and if the band screws

are securely tightened.

d) That the bore and the moving parts surfaces are sufficiently greased.

e) The shooter will inspect the weapon for cracks in the cam follower pin during each rifle

cleaning and inspection. If the shooter is uncertain of the condition of the pin, he should

contact a gunsmith (if not on active duty, he should contact the arms inspector or the

arsenal).

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Yamaha K-31 Service Manual Page 36