Oregon Chain Saw Maintenance & Safety Manual page 67

GUIDE-BAR TROUBLESHOOTING
37
Chipped rails or excessive rail wear just behind the hard stellite alloy
on solid-nose bars, or near the nose connection on replaceable-sprocket-
nose bars.
Remedy: See X.
38
Rails in the tip of a sprocket-nose bar have spread, allowing loss of
bearings.
Remedy: See Y.
39
The sprocket in a sprocket-nose bar breaks.
Remedy: See Y.
Guide Bars
PROBLEM
Bar Sprocket-Nose Failure
63.
63.
63.