58 Chain and Bar Manual
Appearance
Bar rails battered at top in entry
area and at bottom behind nose;
underside of bar rippled.
Condition
Chain runs roughly. Using a guide
bar in this state will cause it and the
chain to wear very quickly.
Cause
Chain tensioned too loosely for
extended period.
Remedy
Level the bar rails. If damage is too
advanced, install a new cutting
attachment (chain sprocket, guide
bar, chain). If only one of these parts
is replaced, it will be quickly worn
again by the other defective parts.
Appearance
Bar groove worn funnel-shaped.
Condition
Chain wobbles in the bar groove
and does not cut straight.
Wear on running faces of cutters
and tie straps.
Cause
Normal wear
Remedy
Install new chain sprocket, guide
bar and chain. If only one of these
parts is replaced, it will be quickly
worn again by the other defective
parts.
6.3 Chain Sprockets
Appearance
Excessive wear on teeth or
circumference.
Cause
Apart from normal wear (about the
life of two chains), chain knock and
wobble causes premature wear on
the tips of the teeth. Excessive
chain stretching or incorrect pitch
cause severe scoring of the tooth
flanks or the circumference of rim
sprockets.
Remedy
Install a new sprocket of the correct
pitch.
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