Guide Bar Nose Conditions - Oregon Harvester Handbook

Guide Bar Troubleshooting
Nose Conditions
87
Mechanical Timber Harvesting Handbook
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 .