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633GC OPERATOR’S MANUAL
21
P/N 70944 Jan 07 © 2007 ICS, Blount Inc.
DRIVE SPROCKET
The drive sprocket (rim sprocket) is a wear item and should be
replaced every 2-3 diamond chains.
IMPORTANT
The needle bearing inside the splined adapter should be greased
regularly and should be replaced with each new clutch cup.
IMPORTANT
A rim sprocket system (Figure 1) consists of a clutch cup
w/ splined adapter and a rim sprocket. When the rim sprocket
wears out, it is the only part that needs to be replaced. The clutch
cup with splined adapter is a wear item that needs replacement
after 3 to 5 rim sprockets have been used.
• Inspect the rim sprocket for wear. Replace the rim sprocket if
the drive teeth become pointed.
• Check the drive sprocket bearing by spinning clutch cup.
Replace the bearing if it is worn out.
• The needle bearing on the drive shaft must be greased
regularly, use high quality water-resistant bearing grease.
Figure 1
Clutch
Cup
Splined
Adapter
Rim
Sprocket
DRIVE SPROCKET REMOVAL
• Remove the side cover, guide bar, diamond chain, and clutch
slurry shield.
• Remove the spark plug and insert the piston stop (supplied
with each saw) into the spark plug hole. Pull the starter cord
slowly until the piston stops. (Figure 2) Use a 19mm wrench to
turn the clutch clockwise and remove.
• Slide the clutch cup/drive sprocket assembly off the shaft.
Remove the needle bearing and inspect for heavy wear or
damage.
Figure 2
MAINTENANCE