Stihl MS 181 User Manual

21MS 171, MS 181, MS 211
6.1 Clutch Drum
– On machines with ErgoStart,
relieve spring tension, b 10.4
– Remove the chain sprocket
cover, bar and chain, b 5
: Pull the hand guard (1) towards
the front handle.
R
Remove and install the clutch drum
(1), see instruction manual.
533RA022 TG
1
TOP
1
533RA023 TG
: Pull off the needle cage (1).
– Clean the needle cage and
crankshaft stub, b 16
– Lubricate the needle cage and
crankshaft stub, b 16
– Inspect the clutch drum (1) for
signs of wear.
If there are signs of serious wear on
the inside diameter of the clutch
drum (1), check the remaining wall
thickness. If it is less than about
80% of the original thickness, install
a new clutch drum.
TOP
533RA024 TG
1
VA
148RA101
80%
100%
1
!
The notch (arrow) in the clutch drum
must engage the worm’s spring (1).
Use the mark (2) for alignment.
– Apply thin coating of oil to the
outside of the clutch drum and
the brake band.
– Reassemble all other parts in the
reverse sequence.
TOP
2
1
533RA025 TG
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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