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Stihl MSA 161 T Notice D'emploi page 28

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15.3
Tensioning the Chain
WARNING
■ To reduce the risk of severe personal injury
from chain derailment, check chain tension
frequently,
5.5. 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,
► Engage the chain brake,
► Remove the battery,
2
1
► Loosen the nut (2).
► Disengage the chain brake,
► Lift the guide bar tip.
► Turn the side chain tensioner (1) clockwise to
tighten the chain.
The chain is properly adjusted when the dis‐
tance (a) between the underside of the guide
bar and the chain is within 0.04 in. (1 mm) and
0.08 in. (2 mm) and 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
chain can move freely along the guide bar.
– Ensure that the drive links remain in the
groove and that the distance (a) between
the underside of the guide bar and the chain
is within 0.04 in. (1 mm) and 0.08 in.
(2 mm).
► Once the chain is properly tensioned, lift the
guide bar tip and tighten the nut to secure the
chain sprocket cover.
► Finally, ensure that the distance a between the
underside of the guide bar and the chain is
within 0.04 in. (1 mm) and 0.08 in. (2 mm).
28
18.2.
16.1.
17.2.
a
16.2.
15 Assembling the Chain Saw
NOTICE
■ Always release tension on the chain after fin‐
ishing 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.
15.4
Lubricating the Saw Chain and
Guide Bar
15.4.1
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 per‐
sonal 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. More‐
over, waste oil is environmentally harmful.
Bar and chain oil lubricates and cools the rotat‐
ing 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 environmen‐
tally compatible quality chain and bar lubri‐
cant. STIHL recommends using rapidly biode‐
gradable STIHL BioPlus.
NOTICE
■ Biodegradable chain oil must be resistant to
aging, since it will otherwise quickly turn to
resin. This results in hard deposits that are dif‐
ficult to remove, especially in the area of the
chain drive and chain. It may even cause the
oil pump to seize.
NOTICE
■ Waste oil does not have the necessary lubri‐
cating properties and is unsuitable for chain
lubrication.
0458-791-8221-D

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