Sprocket Troubleshooting - Oregon CHAINSAW Maintenance And Safety Manual

SPROCKET TROUBLESHOOTING

Most sprocket problems are caused by loose chain tension and failure
to replace the sprocket or clutch drum when necessary.
Sprockets are inexpensive. One worn inexpensive sprocket can rapidly
damage an expensive chain and bar. Do not try to save money by
running new chains on old sprockets. Look for the conditions below and
replace sprockets and clutch drums promptly.
40
Worn outer surfaces on rim sproc-
kets or spur sprockets. Remedy:
See Z.
42
Cracks or breakage on the clutch
drum. Remedy: See BB.
44
Excessive wear on the inside sur-
face of the drum skirt.
Remedy: See DD.
DRIVE SPROCKETS
PROBLEM
Drive Sprocket Wear
41
Worn inner surface on rim sprockets
or wear on the adaptator's splines.
Remedy: See AA.
43
Obvious wear or discoloration
around the outer circumference of
the drum skirt. Remedy: See CC.
DRIVE SPROCKETS DRIVE SPROCKETS
69.