The drive sprocket on a Husqvarna chainsaw helps spin the bar and chain. The sprocket is connected to the clutch, so when the clutch spins the drive sprocket also spins. The guide plates on the underside of the chain run over the notches in the sprocket at very high speeds. For this reason, the holes may become worn or too loose to adequately fit the chain's guide plates. Replacing the sprocket will help improve your engine performance and limit possible damage to your clutch.
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Things you need
- Socket wrench
- Piston stop tool
- Engine grease
Remove the bar nuts holding the clutch cover in place by unscrewing them counterclockwise with the wrench. Release the chain's tension by turning the bar tensioner screw near the bar's heel counterclockwise with the screwdriver.
Take the clutch cover, chain and guide bar off of the clutch. Take the rubber boot on top of the spark plug and gently pry it off with your fingers. Unhook the boot and place the socket wrench over the spark plug.
Unscrew the spark plug by turning the socket wrench counterclockwise. Take the spark plug out. Push the piston stop tool into the hole where the spark plug was. Rotate the clutch by hand until the piston stop tool hits the piston in the cylinder.
Set the wrench around the clutch hub in the centre of the clutch. The clutch hub uses a reverse thread, so turn it clockwise to loosen it. Take the clutch hub off of the crankshaft.
Pull the clutch drum, needle bearing and drive sprocket from the crankshaft. Wipe these parts clean with a rag. Inspect the inner and outer notches of the drive sprockets for heavy grooves, ruptures in the wall or any other signs of damage. Replace if necessary.
Lubricate the needle bearing with about a thumbnail's worth of grease. Wipe the inner and outer sides of the bearings. Set the needle bearing back onto the crankshaft. Place the new drive sprocket on top of the needle bearing. Set the clutch drum over both of them.
Set the clutch hub back in place. Turn the clutch hub counterclockwise with the wrench to tighten it. Pull the piston stop tool from the spark plug's hole. Reinstall the spark plug, spark plug boot, chain, guide bar and clutch cover.
Tips and warnings
- Always grease the needle bearing before reinstalling it.
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