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English / USA
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power:
:
Knock out the standard filter* (1) or
fleece filter* (2) (outer half of filter)
or fabric filter* (3) (outer half of filter)
and inner half of filter* (4) on the
palm of your hand or blow out with
compressed air.
In case of stubborn dirt or sticky
filter fabric:
:
Wash the filter in a clean, non-
flammable solution (e.g. warm
soapy water) and then dry. Do not
expose to high temperatures.
:
Do not impregnate filter with oil.
:
Always replace a damaged filter.
:
Reinstall the air filter.
*
see "Guide to Using this Manual"
42
Cleaning HD Filter
2
If there is a noticeable loss of engine
power:
:
Clean the felt prefilter (1).
After cleaning the prefilter several times:
:
Separate the filter components.
:
Knock the HD filter (2) out on the
palm of your hand and blow it out
with compressed air from the inside
outward.
1
In case of stubborn dirt or sticky filter
fabric:
:
Wash filter with STIHL universal
cleaner or in a fresh, non-flammable
solution (e.g. warm soapy water).
:
Rinse the filter, from the inside
outward, under a low-pressure
water jet – do not use a high-
pressure washer.
:
Dry all parts of the filter. Do not
expose to high temperatures.
MS 440, MS 440 W, MS 440 C
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