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

MS 661 C-M
English
31
For automatic and reliable lubrication of
the chain and guide bar – use only an
environmentally compatible quality
chain and bar lubricant. Rapidly
biodegradable STIHL BioPlus is
recommended.
NOTICE
Biological chain oil must be resistant to
aging (e.g. STIHL BioPlus), 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.
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.
WARNING
Do not use waste oil. Renewed contact
with waste oil can cause skin cancer.
Moreover, waste oil is environmentally
harmful.
NOTICE
Waste oil does not have the necessary
lubricating properties and is unsuitable
for chain lubrication.
Preparing the machine
N Thoroughly clean the filler cap and
the area around it to ensure that no
dirt falls into the tank
N Always position the machine so that
the filler cap is facing upwards
N Open the filler cap
Filling chain oil tank
Standard setting
N Always refill the chain oil tank every
time you refuel
Setting for increased oil delivery rate
See chapter "Oil Quantity Control".
N Always refill the chain oil tank every
time you refuel
In addition, when using this setting, you
must monitor the chain oil level between
refuelings to make sure there is still oil in
the oil tank. If necessary, add chain oil
also between refuelings.
There must always be some chain oil in
the oil tank when the fuel tank reaches
empty.
Take care not to spill chain oil during
refilling and do not overfill the tank.
N Close filler cap
If chain lubrication is abnormally low, the
reason may be a problem in the oil
supply system:
N Check chain lubrication
N Clean the oil passages
N If necessary, contact your servicing
dealer for assistance
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers.
Chain Lubricant Filling Chain Oil Tank
001BA158 KN
1166BA033 AM
1166BA034 AM

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