Clutch Drum Assembly for Husqvarna 550XP Mark II

This clutch drum assembly for the Husqvarna 550XP Mark II replaces a worn drum and drive sprocket, a regular wear item on any saw that works hard. A fresh drum helps a new chain run smoothly and last longer.

When to replace the clutch drum

The sprocket on the clutch drum drives the chain, and it wears every time the saw cuts. A worn sprocket has grooves where the chain drive links sit and will chew up a new chain quickly. Many saw shops suggest replacing the sprocket every two chains or so, or whenever you see clear wear.

Also replace the drum if it is blued from heat, cracked, or wobbles on the crank, or if the needle bearing is worn.

A worn clutch drum can also make the saw feel rough or noisy at idle, and a damaged needle bearing can let the drum wobble and wear the chain unevenly. If the chain keeps turning at idle, look at the clutch springs and idle setting too. Inspect the drum whenever you change the chain, so problems are caught before they damage other parts.

Fitting the new drum

Match the sprocket pitch to your bar and chain, and grease the needle bearing per Husqvarna's service information. Check the clutch shoes and springs while you are in there. More parts are in power equipment parts.

Make sure the saw is off and cool before working on it, and test the chain brake after reassembly.