909 20VCSG Instruction Manual - page 18
18
Care of guide bar
Uneven bar wear causes most guide bar problems,
incorrect sharpening of chain cutter and depth gauge
settings often cause this, when bar wears unevenly, it
widens guide bar groove, this causes chain clatter ad river
popping. Saw will not cut straight, replaces guide bar if this
occurs.
Inspect guide bar before sharpening chain. A worn or
damaged guide bar is unsafe. A worn or damaged guide bar
will damage chain, it will also make cutting harder.
Normal guide bar maintenance
1. Remove guide bar from chain saw.
2. Remove sawdust from guide bar groove periodically.
Use putty knife or wire,
3. Clean oil slots after each day of use.
4. Remove burrs from sides of guide bar. Use flat file to
make side edges square.
Replace guide bar when
•
Bar is bent or cracked.
•
Inside groove of bar is badly worn.
Chain sharpening
1. Remove battery pack.
2. Wear protective gloves.
3. Ensure the chain is correctly tensioned and not too loose.
4. Use a round file for chain sharpening, diameter
equivalent to 1.1 times the cutting tooth depth.
5. File at a horizontal angle, 35° to the bar.
6. File from inside towards outside of the tooth only.
7. Sharpen each tooth equally by using the same number of
strokes.
8. File at an angle of 90° to the bar.
9. Check the safety depth gauge height every 5 chain
sharpening. Use depth gauge measuring instrument to
check the height of the depth gauge.
Maintenance
Prior to performing any maintenance or adjustments to the saw,
remove the battery pack to prevent any accidental starting
1. Ensure that the motor and air slots are free and
unobstructed.
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