Stihl OILOMATIC Manual page 50

Condition
Nicks in both sides of several drive
link tangs (not always in
consecutive tangs).
Cause
Insufficient chain tension. Drive
links jump out of the groove and
snag at the bar nose or in the
groove entry area.
Remedy
Tension chain properly. Check
groove entry area on bar tail and
restore funnel shape if necessary.
Condition
Tangs of all drive links flattened.
Cause
Bar groove too shallow.
Remedy
Install a new guide bar.
Chain and Bar Manual
Condition
All drive link tangs worn unevenly at
one side.
Cause
Cutters on one side of the chain
incorrectly sharpened (angles,
cutter lengths, depth gauges).
Remedy
Resharpen chain correctly. If this
has caused excessive groove wear,
replace the guide bar.
Condition
Sides of all drive link tangs worn and
points rounded.
Cause
Chain wobble in bar groove
because groove is worn or spread.
Remedy
Replace the guide bar.
Condition
All drive link tangs worn to
"hourglass" shape.
Cause
Chain wobble in bar groove
because of unevenly sharpened
cutters (angles, lengths, depth
gauges) in an irregular pattern on
both sides of chain.
Remedy
Resharpen chain correctly. If this
has caused excessive groove wear,
replace the guide bar.
49