Stihl MS 661 C-M User Manual

94 MS 661, MS 661 C-M
12. Chain Lubrication
12.1 Pickup Body
Impurities gradually clog the fine
pores of the filter with minute
particles of dirt. This prevents the oil
pump from supplying sufficient oil.
In the event of problems with the oil
supply system, first check the oil
tank and the pickup body.
– Troubleshooting, b 3.3
– Open the oil tank cap and drain
the oil tank b 1.1.
– Collect the oil in a clean
container, b 1.1
– Clean the oil tank if necessary,
b 16
: Use hook (2) 5910 893 8800 to
remove the pickup body (1) from
the oil tank.
Do not overstretch the suction hose.
– Pull off the pickup body (1),
check it and replace if necessary.
– Reassemble in the reverse
sequence.
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2
12.2 Oil Suction Hose
– Open the oil tank cap and drain
the oil tank b 1.1.
– Remove the clutch, b 4.2
– Remove the brake band, b 5.2
– Remove the oil pump, b 12.3
: Remove the oil suction hose (1)
together with the pickup body.
– Check the oil suction hose and
pickup body and replace if
necessary.
– Fit the pickup body, b 12.1
Installing
– Coat groove in fuel suction hose
with STIHL press fluid, b 16
: Push the oil suction hose (1),
pickup body first, through the
housing bore (arrow).
1166RA340 TG
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1166RA341 TG
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: Position the oil suction hose (1)
so that the tab (arrow) locates
against the rib.
: Push home the oil suction
hose (1) until its groove is
properly seated in the crankcase
bore.
– Check position of the pickup body
and, if necessary, use the hook
5910 893 8800 correct its
position in the oil tank.
– Install the oil pump, b 12.3
– Reassemble all other parts in the
reverse sequence.
12.3 Oil Pump
– Troubleshooting, b 3.3
– Remove the clutch, b 4.2
– Remove the brake band, b 5.2
: Remove the washer (1).
TOP
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1166RA428 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