Stihl MS 172 User Manual

1 Carburetor adjusting screw
The carburetor adjusting screw is for setting
the carburetor.
2 Front hand guard
The front hand guard protects the operator's
left hand against contact with the saw chain
and is used to engage the chain brake in the
event of kickback.
3 Muffler
Reduces chainsaw noise emissions.
4 Spiked bumper
The spiked bumper supports the chainsaw
against the wood while cutting.
5 Guide bar
The guide bar supports and guides the saw
chain.
6 Saw chain
The saw chain cuts the wood.
7 Tensioning screw
The tensioning screw is used to adjust the
chain tension.
8 Chain sprocket
The chain sprocket drives the saw chain.
9 Chain sprocket cover
The chain sprocket cover covers the chain
sprocket and fastens the guide bar to the
chain saw.
10 Nut
The nut secures the chain sprocket cover to
the chainsaw.
11 Chain catcher
The chain catcher catches the saw chain if it
breaks or comes off the bar.
12 Chain scabbard
The chain scabbard protects against contact
with the saw chain.
13 Spark plug
Ignites the fuel-air mixture in the engine.
14 Shroud lock
The shroud lock secures the shroud to the
chainsaw.
15 Cover
The cover covers the engine.
16 Felling notch
The felling direction can be controlled by the
felling notch.
17 Spark plug boot
Connects the ignition lead to the spark plug.
18 Air filter
The air filter filters the air entering the engine.
19 Master control lever
For starting, running and stopping the engine.
20 Throttle trigger lockout
The throttle trigger lockout unlocks the throttle
trigger.
21 Control handle
The control handle is used to control, hold
and guide the chainsaw.
22 Rear hand guard
The rear hand guard protects the right hand
against contact with the saw chain if the chain
breaks or comes off the bar.
23 Throttle trigger
The throttle trigger is used to control the
engine speed.
24 Fuel tank cap
The fuel tank cap closes the fuel tank.
25 Starter grip
The starter grip is used for starting the
engine.
26 Oil tank cap
The oil tank cap closes the oil tank.
27 Handlebar
The handlebar is used to hold, control and
carry the chainsaw.
# Serial number
3.2 Equipment features
Depending on the respective market, the chain‐
saw can have the following features:
1
3
1
2
A
B
0000097414_001
Manual fuel pump (A)
1 Manual fuel pump
The manual fuel pump eases engine starts.
Fast-tensioning device (B)
1 Tensioning gear
The tensioning gear moves the guide bar and
thus tensions and slackens the saw chain.
2 Adjusting wheel
The adjusting wheel is used to adjust the
chain tension.
3 Overview English
0458-200-0121-B 3

Stihl MS 172 Specifications

General

Sound pressure level	100 dB(A)
Sound power level	113 dB(A)
Displacement	31.8 cc (1.9 cu in)
Saw chain pitch	3/8"
Recommended bar length	30-35 cm (12-14 in)