Stihl MS 661 C-M User Manual

95MS 661, MS 661 C-M
: Pull the worm (1) with drive
spring (2) out of the oil pump.
– Check the spring and worm and
replace if necessary.
: Take out the screws (1) and
remove the oil pump (2).
: Remove the sealing ring (1).
– Check the oil pump and replace it
if necessary
1166RA342 TG
1
2
1166RA343 TG
1
1
2
1166RA344 TG
1
Installing
: Fit a new sealing ring (1) in the
bore (arrow).
: Line up the oil pump (1) so that
the stub (2) engages the oil
suction hose (3) and stub (4)
slips into the sealing ring (5).
– Coat stubs and sealing ring with
STIHL press fluid, b 16
1166RA345 TG
1
1166RA346 TG
12
3
5
4
: Push oil pump (1) into position as
far as stop.
: Fit the screws (2)
and tighten them down firmly.
– Push the worm fully home.
: Push the cover washer (1) into
position.
Installed position is correct when
"TOP" (arrow) faces outwards.
– Reassemble all other parts in the
reverse sequence.
1166RA347 TG
2
2
1
TOP
1
1166RA004 TG

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