6 Steps to Replace a Chainsaw Sprocket and Clutch Drum

Remove the bar, chain, clutch cover, and chain brake assembly first. You need clear access to the clutch drum and sprocket.

Lock the piston using a piston stop or a length of old starter rope down the spark plug hole. This prevents the engine from turning while you work on the clutch.

Unscrew the clutch nut with a clutch removal tool and breaker bar. Most saws use a left-hand thread, so turn it clockwise to loosen.

Pull the clutch off by hand. If it is stuck, use a two-jaw puller. A cheap puller from a hardware store works fine for stubborn clutches.

Slide off the old sprocket drum and bearing, then install the new one in reverse order. Make sure the new sprocket matches your chain’s pitch and gauge.

Reinstall the clutch nut, torque it to spec, remove the piston stop, and reassemble the saw. Replace the sprocket every two or three chains to avoid wearing out chains prematurely.