Stihl MS 172 User Manual

2
3
1
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► Turn the shroud locks (1) counterclockwise
until the cover (2) can be removed.
► Remove cover (2).
► Pull off the spark plug boot (3).
► If the area around the spark plug is soiled:
Clean it with a cloth.
► Unscrew the spark plug.
► Clean the spark plug with a cloth.
► If the spark plug is corroded: Replace the
spark plug.
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► Insert and tighten down the spark plug.
► Press the spark plug boot (3) firmly home.
► Fit the cover (2).
► Turn the shroud locks (1) clockwise and
tighten them firmly.
The cover (2) is closed.
16 Maintenance
16.1 Maintenance intervals
Maintenance intervals depend on the ambient
conditions and the operating conditions. STIHL
recommends the following maintenance inter‐
vals:
Chain brake
► Have a STIHL dealer service the chain broke
in the following intervals:
–
Full-time use: every three months
–
Part-time use: every six months
–
Occasional use: every year
After every 100 hours of operation
► Replace the spark plug.
Weekly
► Check the chain sprocket.
► Check and deburr the guide bar.
► Check and resharpen the saw chain.
Monthly
► Have the oil tank cleaned by a STIHL dealer.
► Have the fuel tank cleaned by a STIHL dealer.
► Have the pickup body in the fuel tank cleaned
by a STIHL dealer.
Annually
► Have the pickup body in the fuel tank replaced
by a STIHL dealer.
16.2 Deburring the Guide Bar
A burr can build up on the outer edge of the
guide bar.
► Remove burr with a flat file or a STIHL guide
bar dressing tool.
► If you have any queries: Contact your STIHL
servicing dealer.
16.3 Sharpening the Saw Chain
Correctly sharpening saw chains requires a lot of
practice.
STIHL files, STIHL filing aids, STIHL sharpeners
and the brochure “Sharpening STIHL Saw
Chains” help you achieve the right results. To
obtain the brochure visit http://www.stihl.com/
sharpening-brochure.
STIHL recommends you have saw chains
resharpened by a STIHL servicing dealer.
WARNING
■ The chain's cutters are very sharp. There is a
risk of cut injuries.
► Wear work gloves made of durable mate‐
rial.
0000-GXX-1219-A0
► File each cutter with a round file so that the
following points are observed:
–
Round file matches the chain pitch.
–
File from the inside to the outside of the cut‐
ter.
–
Hold the file at right angle to the guide bar.
–
Maintain a filing angle of 30°.
16 Maintenance English
0458-200-0121-B 25

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)