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Checking chain lubrication
Breaking in the saw chain
Every new chain has to be broken in for about 2 to 3
minutes. Ample chain lubrication is essential during this
period. After breaking in, check chain and adjust if
necessary.
Correct chain tension
The chain must always be slackened off after finishing
cutting work. A chain properly tension when it is warm
would, when the temperature drops, be subjected to such
great contraction stresses that the chain would break and
also damage the crankshaft and bearings.
The chain must, therefore, always be tensioned - with the
engine off - before you start cutting. Chain tension is
correct in the cold condition when the chain fits snugly on
the underside of the bar and can still be moved along the
bar by hand. Extreme care must be taken as the cutting
edges are very sharp.
Worn chain sprocket
When the chain saw is operated at extremely low outside
temperatures a correctly cold-tensioned chain will begin to
sag noticeably as it warms up to normal operating tempe-
rature. The chain must then be retensioned. However, the
chain must be immediately slackened off again after
shutting down the saw. This is necessary to avoid contrac-
tion stress which would occur as Ithe chain cools down to
ambient temperature.
A new chain must be retensioned more frequently than a
used one until it has stretched fully.
Chain sprocket
The stress and strain on the chain sprocket are particularly
high. 11 the wear marks on the teeth are very pronounced
(about 0.5 mm/0.02 in), the sprocket should be replaced.
A worn sprocket reduces the service life of the saw chain.
The chain sprocket should be replaced with every second
chain. It is best to use two chains alternately with one
sprocket.
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