15
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8. Maintenance of Saw Chain and Guide Bar
1. Saw Chain
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
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 the chain
(see “Chain maintenance table”).
Place the file on the cutter and push straight for-
ward.
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.
Be sure to round off the
front edge to reduce the chance of kickback
or tie-strap breakage.
!
WARNING!
!
WARNING!
!
WARNING!
Make sure every cutter has the same length and
edge angles as illustrated.
2. 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.
(1) Appropriate
gauge checker
(2) Depth gauge
standard
(3) Make the shoul-
der round: (see
“Chain mainte-
nance table”)
(A)
Cutter length
(30°) Filing angle
(85°) Side plate angle
(60°) Top plate cutting
angle
(1) Ruler
(2) Gap
(3) No gap
(4) Chain tilts
8. Maintenance of Saw Chain and Guide Bar
