Stihl MS 181 User Manual

70 MS 171, MS 181, MS 211
– Push the oil pump part way into
the bore.
: Push smooth pin of installer (1)
1130 into the oil pump.
: Place the installing tool (1)
1123 890 2202 in position and
push the pin into the bore (arrow).
533RA286 TG
1
533RA282 TG
1
– Place the lever (1) of the
installing tool in the installer and
secure it with the pin (arrow).
: Use the lever (1) to press the oil
pump into the bore as far as stop.
– Remove the installing tool and
installer.
– Coat profile on oil suction hose
connector with oil, b 16
: Push home the oil suction hose
(1) until the tab is completely
flush with the guide (arrow) in the
engine housing, b 13.2
– If necessary, inspect the worm
and replace it if necessary,
b 8.3
– Install the handle frame, b 11.4
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5
533RA289 TG
1
533RA279 TG
1
13.4 Valve
A valve is installed in the tank wall to
keep internal tank pressure equal to
atmospheric pressure. The valve
must be replaced if it is very dirt or
damaged.
– Remove the chain sprocket
cover, bar and chain, b 5
– Open the oil tank cap and drain
the oil tank. Collect chain oil and
dispose of it properly, b 1
: Use a 6 mm drift to carefully drive
the valve out of its seat in the
housing and into the oil tank.
: Remove the old valve (1) from
the oil tank.
533RA291 TG
533RA292 TG
1
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Stihl MS 181 Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	400 mm
Product color	Black, Grey, Orange
Chain tensioner	Yes
Motor speed (max)	10000 RPM
Fuel tank capacity	0.266 L
Engine displacement	31.8 cm³
Power source	Gasoline
Sound power level	112 dB
Vibration emission	3.5 m/s²
Sound pressure level	100 dB

Weight and Dimensions

Weight	43004300 g