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Drive Sprocket Troubleshooting Problem


Drive Sprocket Wear 40


41 42


Worn outer surfaces on rim drive sprockets or spur drive sprockets. Remedy: See Z.


43


Worn inner surface on rim drive sprockets or wear on the adaptor’s splines. Remedy: See AA.


44


Cracks or breakage on the clutch drum. Remedy: See BB.


Obvious wear or discoloration around the outer circumference of the drum skirt. Remedy: See CC.


Excessive wear on the inside surface of the drum skirt. Remedy: See DD.


Remedies: Z. 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. (picture 40)


AA. 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. (picture 41)


BB. Do not attempt to repair cracked or broken clutch drums. Replace the drum. (picture 42)


CC. Replace the drum. Have your chain saw dealer adjust the saw chain brake strap. (picture 43)


DD. Replace the drum. Have your chain saw dealer service the chain saw’s clutch. (picture 44)


71


DRIVE SPROCKET


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