Operators Manual

72 MS 171, MS 181, MS 211
14. Fuel System
When fitting or removing hoses in
the fuel system:
Do not use pliers or any other
sharp-edged tools since they may
damage hoses.
Remove and install hoses by hand.
Use STIHL Press Fluid when fitting
hoses, b 16
14.1 Air Filter
Dirty air filters reduce engine power,
increase fuel consumption and
emissions and make starting more
difficult.
The air filter should be checked
when there is a noticeable loss of
engine power.
– see also Troubleshooting,
b 4.6 or b 4.7
– Remove the shroud, b 8.4
: Lift retaining tabs (arrows) a little
and remove the air filter (1).
– Check the air filter and clean of
replace if necessary
– see instruction manual.
– Install in the reverse sequence.
1
533RA095 TG
14.2 Baffle / Filter Base
– Remove the air filter, b 14.1
: Use screwdriver 5910 890 2420
to unscrew the nuts (arrows).
– Remove and inspect the baffle
(1) and replace if necessary.
: Take out the screws (arrows).
– Remove and inspect the filter
base (1) and replace if
necessary.
533RA100 TG
1
533RA103 TG
1
: Inspect the stop buffers (1) and
replace if necessary – note
correct position (arrows) when
installing.
: Inspect the O-ring (2) and replace
if necessary.
– Coat O-ring (2) with STIHL Press
Fluid before installing, b 16
– Push the filter base (1) onto the
studs (2).
: Fit the screws (arrows) and
tighten them down firmly.
2
533RA112 TG
1
1
533RA241 TG
1
2
2