Stihl MS 172 User Manual

► Hold the chainsaw using one of the three pos‐
sible options:
–
Place the chainsaw on level ground. Hold
the saw firmly on the ground with your left
hand on the handlebar – your thumb should
be under the handlebar. Put the toe of your
right boot into the rear handle and press
down.
–
Place the chainsaw on level ground. Hold
the saw firmly on the ground with your left
hand on the handlebar – your thumb should
be under the handle. Put the heel of your
right boot into the rear handle and press
down.
–
Hold the chainsaw firmly with your left hand
on the handlebar – your thumb should be
under the handle. Hold the rear handle
tightly between your legs, just above the
knees.
0000-GXX-2937-A1
► Pull the starter grip slowly with your right hand
until you feel it engage.
► Pull the starter grip quickly and allow the
starter rope to rewind several times until the
engine runs.
► Press the throttle trigger lockout (5) and keep
pressed.
► Blip the throttle trigger (4).
The master control lever (3) springs to position
. The engine runs at idling speed.
NOTICE
■ Do not accelerate the engine with the chain
brake engaged since this can damage the
chain brake.
►
Disengage the chain brake before you start
cutting.
► Disengage the chain brake.
The chainsaw is ready for use.
► If the saw chain rotates while the engine is
idling: See troubleshooting.
Idle speed adjustment is not correct.
► If the engine does not start: Prepare the
engine for the start and then try again to start
the engine.
9.4 Shut off the engine
1
2
3
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► Release the throttle trigger (2) and throttle trig‐
ger lockout (3).
The engine runs at idling speed.
► Move the Master Control Lever (1) to posi‐
tion .
The engine stops and the Master Control lever
(1) springs back to position
.
► If the engine does not stop:
► Move the Master Control Lever to posi‐
tion .
The engine stops.
► Do not use the chainsaw. Consult a STIHL
dealer.
The Master Control lever is defective.
10 Checking the Saw
10.1 Checking the Chain Sprocket
► Shut off the engine.
► Disengage the chain brake.
► Remove the chain sprocket cover.
► Remove the guide bar and saw chain.
a
0000-GXX-1216-A0
► Use a STIHL gauge to check the wear marks
on the chain sprocket.
► If wear marks are deeper than a = 0.5 mm: Do
not use your chainsaw and contact your
STIHL dealer for assistance.
The chain sprocket must be replaced.
10.2 Checking the Guide Bar
► Shut off the engine and engage the chain
brake.
► Remove the chain and guide bar.
10 Checking the Saw English
0458-200-0121-B 17

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)