Guide Bar
87 Mechanical Timber Harvesting Handbook
Guide Bar Troubleshooting
Nose Conditions
11. Chipped rails or excessive rail
wear a few inches back from the
nose end of the bar.
Cause: Loose saw chain tension.
Symptoms: Saw chain damage, saw
chain throwing, shortened guide
bar life.
Remedy: Use proper saw chain
tension and invert the guide bar on the
saw periodically to distribute wear.
12. Rails in the tip of a sprocket-nose
guide bar spread, allowing loss of
bearings.
Cause: Accidents or irregular
operating techniques twist the nose or
push the drive links sideways against
the nose’s rails.
Symptoms: Sprocket breakage.
Remedy: Replace sprocket
components. Keep the guide bar nose
away from objects not intended for
cutting.
13. Sprocket in the sprocket nose
guide bar breaks.
Cause: High saw chain tension,
accidents, saw chain broadsided by
log, pulling saw chain out of the guide
bar rails.
Symptoms: Guide bar nose sprocket
no longer functions.
Remedy: Replace sprocket components.
Use proper saw chain tension.
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