User manual

Understanding Sprockets

SPUR SPROCKET CENTER DRIVE

RIM SPROCKET

Drive Sprockets are as important to your chain saw as the engine

and the saw chain. The Sprocket is the stepping block between

the power from the engine and the saw chain using centrifugal

force to drive the chain.

There are two types of sprockets. SPUR SPROCKETS are a machine

produced, one-piece solid construction. Spur sprockets incorporate

both the clutch drum and the drive sprocket into a single piece.

SPROCKETS

The RIM SPROCKETS are a two piece construction that

allow the chain to be aligned with the bar groove because

the rim rides on the hub splines. The rim sprocket will take the

majority of the wear, reducing wear to the center drive sprocket.

Sprockets are a lot like saw chain and guide bars. The pitch

of a sprocket must match that of the saw chain and that

of the sprocket nose guide bar.