Lubricating The Saw Chain And Guide Bar; Bar And Chain Lubricant; Filling The Chain Oil Tank - Stihl MS 661 C-M Instruction Manual

English
► Lift the guide bar tip.
► Turn the side chain tensioner (2) clockwise to tighten the
chain.
The chain is properly adjusted when 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) 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
counter-clockwise 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 nuts 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).
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.
11 Lubricating the Saw Chain and Guide
Bar

11.1 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
36

11 Lubricating the Saw Chain and Guide Bar

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.
NOTICE
Biodegradable chain oil must be resistant to aging, since it
will otherwise quickly turn to resin. This results in hard
deposits that are difficult 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 lubricating properties
and is unsuitable for chain lubrication.

11.2 Filling the Chain Oil Tank

Opening and Filling the Chain Oil Tank
To fill the chain oil tank:
► Shut off the engine, @ 15.
► Engage the chain brake, @ 12.1.
► Position the chain saw on a level surface with the oil filler
cap facing upwards.
► Clean the area around the oil filler cap with a slightly
dampened cloth.
0458-759-8221-C