48 Chain and Bar Manual
6. Faults – Causes, Remedies
6.1 Saw Chain
6.1.1 Drive Links
Condition
The fronts and backs of alI drive
links are peened.
Cause
a) Insufficient chain tension.
b) Sprocket pitch does not match
chain pitch.
c) New chain run on a worn
sprocket.
Remedy
a) Install new chain and tension it
correctly.
b) and c) Install a new chain and a
new sprocket that matches the
chain pitch and the saw.
Condition
Battered and chipped tangs on
several drive links in a row.
Cause
Loose chain has jumped off the bar
or, if chain has broken, the links
concerned have jammed in the
sprocket.
Remedy
Install new chain or replace affected
length of chain. Match new parts to
other parts of chain.
Tension ch ai n p r o p erly.
Condition
The backs of all drive link tangs are
rounded.
Cause
As a result of excessive chain
stretching (play in joints) the pitch
no longer matches the sprocket –
insufficient lubrication.
Remedy
Install new chain sprocket and new
chain. Check chain lubrication and
repair if necessary.
Condition
Rounded, concave bottom on all
drink link tangs.
Cause
Groove too shallow at nose of
Duromatic bar.
Remedy
Install a new guide bar.
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