Tensioning The Saw Chain; Lubricating The Saw Chain And Guide Bar - Stihl MSE 141 C Instruction Manual

10 Assembling the Chain Saw

10.3 Tensioning the Saw Chain

WARNING
To reduce the risk of severe personal injury from chain
derailment, check chain tension frequently, @ 5.6. At
operating temperatures, the chain stretches and sags. New
chain tends to stretch more than used chain. Tension the
chain so that the drive links cannot come out of the groove
on the underside of the guide bar.
To properly tension the chain:
► Switch off the chain saw, @ 13.2.
► Engage the chain brake, @ 11.1.
► Disconnect the chain saw from the power supply.
► Disengage the chain brake, @ 11.2.
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2
► Loosen the nut (1).
► Lift the guide bar tip.
► 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.
0458-729-8221-A
– Reduce the tension by turning the side chain tensioner
counterclockwise until the 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.

10.4 Lubricating the Saw Chain and Guide Bar

10.4.1 Bar and Chain Lubricant
WARNING
Never operate your saw without bar and chain lubrication. If
the chain runs dry, the cutting attachment will be damaged
beyond repair within a very short time. A damaged chain
may break, resulting in severe or fatal personal injury.
Always check chain lubrication and the oil level in the tank
before starting work and periodically during work.
WARNING
Never use waste oil to lubricate your STIHL saw chain and
guide bar. Repeated contact with waste oil can cause skin
cancer. Moreover, waste oil is environmentally harmful.
Bar and chain oil lubricates and cools the rotating saw chain.
The service life of the chain and guide bar depends on the
quality of the lubricant. It is therefore essential to use only a
specially formulated chain lubricant.
► For automatic and reliable lubrication of the chain and
guide bar, use only an environmentally compatible quality
chain and bar lubricant. STIHL recommends using rapidly
biodegradable STIHL BioPlus.
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