Drive Sprocket Troubleshooting
Worn outer surfaces on rim drive sprockets or spur drive sprockets. Remedy: Such outer surface wear is normal over time. Replace rim drive sprockets and spur drive sprockets when wear is 1/64" (0.4 mm) deep. Never run saw chain on severely worn drive sprockets. Severely worn drive sprockets could break during operation. Worn inner surface on rim drive sprockets or wear on the adaptor’s splines. Remedy: Such wear indicates that saw chain drive links are bottoming out on the adaptor’s splines. Replace the clutch drum. Replace the rim drive sprocket. . Cracks or breakage on the clutch drum. Remedy: Do not attempt to repair cracked or broken clutch drums. Replace the drum. Obvious wear or discoloration around the outer circumference of the drum skirt. Remedy: Replace the drum. Have your chainsaw dealer adjust the saw chain brake strap.
Excessive wear on the inside surface of the drum skirt. Remedy: Replace the drum. Have your chainsaw dealer service the chainsaw’s clutch.
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Safety & Maintenance Manual
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