Tensioning The Saw Chain - Stihl MSE 141 C Instruction Manual

11 Assembling the Chain Saw
11.2.2 Removing the Guide Bar and Saw Chain
► Unscrew the nut.
► Remove the chain sprocket cover.
► Turn the side chain tensioner counterclockwise until it
stops and the saw chain is loose.
► Remove the guide bar and saw chain.
NOTICE
The top and bottom of the guide bar are symmetrical, and
the bar may be mounted with the printing facing up or down.
Flipping the guide bar each time the chain is sharpened or
changed will help reduce uneven wear and improve its
service life.

11.3 Tensioning the Saw Chain

WARNING
To reduce the risk of severe personal injury from chain
derailment, check chain tension frequently, @ 6.6. At
operating temperatures, the chain stretches and sags. New
saw chain tends to stretch more than used chain. Tension
the saw chain so that the drive links cannot come out of the
groove on the underside of the guide bar.
To properly tension the saw chain:
► Switch off the chain saw, @ 14.2.
► Engage the chain brake, @ 12.1.
► Disconnect the chain saw from the power supply.
► Disengage the chain brake, @ 12.2.
0458-729-8621-A
► Loosen the nut (1).
► Turn the side chain tensioner (2) clockwise to tighten the
chain.
A properly adjusted chain will sit closely against the
underside of the guide bar but can still be pulled easily
along the bar by hand. Always wear gloves when handling
the chain.
► If the chain cannot be moved along the guide bar, it is too
tight.
– Reduce the tension by turning the side chain tensioner
counterclockwise until the saw chain can move freely
along the guide bar.
– Ensure that the drive links remain in the groove and that
the chain fits snugly against the underside of the guide
bar.
► Once the chain is properly tensioned, tighten the nut to
secure the chain sprocket cover.
NOTICE
Always release tension on the chain after finishing work. The
chain contracts as it cools down. If it is not slackened, it can
damage the drive shaft and bearings. Properly re-tension
the chain before using the saw again.
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