Centrifugal Clutch

Dismantling

1.Dismantle the clutch cover.

2.Remove the spark plug and insert the piston stop (A) in the spark plug hole. See service tools.

3.Use a 19 mm spanner and dismantle the clutch hub. NOTE! Left-hand thread.

4.Remove the washer (B), clutch drum (C) and needle bearing (D).

5.If necessary, dismantle the clutch shoes as follows:

A.Place the clutch hub in a vice.

B.Using a screwdriver press out the shoe holder.

C.Dismantle the shoes and springs.

Cleaning and inspection

Clean all components and check the following:

1.That the outer measurement of the clutch hub is not less than 58 mm at the most worn position.

2.Check that there is no play between the clutch shoe and clutch holder.

3.Both springs must always be replaced if just one spring is damaged.

4.A complete clutch or springs are available as spare parts.

5.Wear to the chain drive sprocket.

6.That the needle bearing is trouble free and that the journal surface on the crankshaft is not damaged.

7.That the clutch drum’s friction surface is intact and that the journal surface is not damaged.

58 mm

English – 27

338XPT, 334T, Chain Saw, 336, 339XP specifications

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