Sprocket Maintenance - Oregon CHAINSAW Maintenance And Safety Manual

BASIC SPROCKET-MAINTENANCE TASKS
5. ▲■ Chain tension is especially important when the saw is tipped on
its side during felling cuts. Loose chain (and rim-type sprocket, if used),
will slide down and out of alignment with the bar. Loose chain tension
is the leading cause of sprocket problems.
Note: If your saw has a chain brake, check the chain brake's action
according to the instructions in your saw operator's manual. Be sure the
chain-brake strap around your clutch skirt is not too light, which can lead
to clutch-drum overheating and failure.
6. ● Clean any build-up of sap or debris from splined hub so rim
sprocket can float freely.
7. ◆ Do not run old chain on a new sprocket, or a new chain on an old
sprocket. Use two new chains in rotation with each new sprocket so all
can wear together. Replace sprocket every two chains, or sooner.
8. ◆ Apply clean lithium-based grease to the clutch drum's bearings
each time the sprocket is removed.
68.
DRIVE SPROCKETS
DRIVE SPROCKETS DRIVE SPROCKETS