Stihl MS 661 C-M Installation, Operation & Maintenance Manual

MS 661 C-M
English
27
Releasing the chain brake
N Pull hand guard towards the front
handle until it engages audibly –
chain brake is released
Fitting the saw chain
WARNING
Put on protective gloves – risk of injury
by the sharp cutters
N Fit the chain starting at the nose of
the guide bar
N Position the guide bar over the
bolts (1) – the cutting edges of the
saw chain must point to the right
N Position the locating hole (2) over
the peg of the tensioner slide –
simultaneously place the saw chain
over the sprocket wheel (3)
N Turn screw (4) to the right until there
is very little chain sag on the
underside of the bar – and the drive
link tangs engage in the bar groove
N Refit the chain sprocket cover – and
then screw on the nut by hand until
it is fingertight (only tighten the nuts
after the saw chain has been
tensioned)
N Go to chapter "Tensioning the saw
chain"
Retensioning during cutting work:
N Shut off the engine.
N Loosen the nuts.
N Hold the bar nose up.
N Use a screwdriver to turn the
tensioning screw (1) clockwise until
the chain fits snugly against the
underside of the bar.
N While still holding the bar nose up,
tighten down the nuts firmly.
N Go to "Checking Chain Tension".
A new chain has to be retensioned more
often than one that has been in use for
some time.
N Check chain tension frequently –
see chapter on "Operating
Instructions".
001BA186 KN
143BA003 KN
3
1
1
2
4
001BA187 KN
Tensioning the Chain
1
133BA024 KN

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g