Product Manual

8
5. SPROCKET
Check for cracks and for excessive
wear interfering with the chain drive.
If the wear is considerable, replace it
with a new one. Never fit a new
chain on a worn sprocket, or a worn
chain on a new sprocket.
MAINTENANCE OF SAW CHAIN
AND GUIDE BAR
SAW CHAIN
CAUTION: It is very important for
smooth and safe operation to always
keep the cutters sharp.
The cutters need to be sharpened
when:
• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut path does not go straight.
• Vibration increases
• Fuel consumption increases
Cutter setting standards:
CAUTION: Be sure to wear safety
gloves.
BEFORE FILING:
• Make sure the saw chain is held
securely.
• Make sure the engine is stopped.
• Use a round file of proper size for
chain.
Chain type: 3/8 .050
File Size: 5/32” (4.0mm)
Place the file on the cutter and push
straight forward. Keep the file
position as illustrated.
After each cutter has been filed,
check the depth gauge and file it to
the proper level as illustrated.
Appropriate gauge checker.
Depth gauge standard.
CAUTION: Be sure to round off the
front edge to reduce the chance of
kickback or tie-strap breakage.
Make sure every cutter has the
same length and edge angles as
illustrated.
GUIDE BAR
• Reverse the bar occasionally to
prevent partial wear.
• The bar rail should always be
square. Check for wear of the bar
rail. Apply a ruler to the bar and
the outside of a cutter. If a gap is
observed between them, the rail is
normal. Otherwise, the bar rail is
worn. Such a bar needs to be
corrected or replaced.
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