32
Carlton
®
Maintenance and Safety Manual
Drive Sprocket Terms
Rim drive sprockets
Spur drive sprockets
The power from the chain saw’s engine is transferred to the saw
chain through a centrifugal clutch and drive sprocket. Chain
saws use two types of drive sprockets:
Rim drive sprocket
systems
and
spur drive sprockets
.
A rim drive sprocket
is a two piece unit that allows you to
replace the rim on the drum adaptor assembly as the rim wears
out.
A spur drive sprocket
incorporates the centrifugal clutch drum
and drive sprocket into a single piece and must be changed as
a complete unit.
Clutch drum
Bore
Clutch skirt
Drum
adaptor
assembly
Splined hub/
adaptor
Rim
drive sprocket
Wear depth
indicators
Bore
Clutch skirt
Clutch drum
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