633GC OPERATOR’S MANUAL
19
MAINTENANCE
DRIVE SPROCKET
The drive sprocket (rim sprocket) is a wear item and should be
replaced with every new chain.
The needle bearing inside the splined adapter should be greased
after every use and should be replaced with every new rim
sprocket.
•
A rim sprocket system (Figure 8) consists of a Clutch Cup with a
Splined Adapter and a Rim Sprocket. When the rim sprocket wears out,
only the rim sprocket needs to be replaced. The clutch cup and adapter
are also wear items and will eventually need to be replaced, but will
usually last 3 to 5 rims.
•
Inspect drive sprocket for wear. Replace rim sprocket if grooves cut
into the top of the rim
•
Check drive sprocket bearing by spinning clutch cup. Replace if worn
out.
•
The needle bearing on the drive shaft has to be greased regularly
(daily). Use high quality water-resistant bearing grease.
•
Bearing Tip: It is not necessary to remove the clutch cup to grease
the bearing. There is a channel that goes directly from the drive shaft
to the bearing (Figure 9). Simply inject grease directly into the end of
the drive shaft.
Drive Sprocket Removal
•
Remove bar, chain, and clutch dust shield.
•
Remove spark plug and insert piston stop (supplied with each saw) into
spark plug hole. Pull starter rope gently until the piston stops against
the tool. Using a 19mm wrench, rotate the clutch in the clockwise
direction to remove. If an impact wrench is used the spark plug does
not have to be removed.
•
Carefully slide the clutch cup/drive sprocket assembly off the shaft.
The needle bearing may stay with the cup or remain on the shaft.
Remove the needle bearing and inspect for heavy wear or damage.
IMPORTANT
IMPORTANT
Figure 8
Figure 9
Splined
Adapter
Clutch
Cup
Rim
Sprocket
Grease
Hole
Summary of Contents for 633GC
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