AIR FILTER
8
17
2
3
1
1
2
3
502 53 07-26
Cylinder
cooling air
In
To carburettor
IMPORTANT!
Stone and concrete dust are the engine's greatest enemy!
Check the condition of the inlet bend and that it seals perfectly
against the carburettor and cylinder cover.
Dust in the inlet bend indicates a serious fault in the filter
system, which must be rectified before the machine is used.
Function
Husqvarna Active Air Filtration
is a filter system that
effectively purifies the air to the engine in
three separate steps
and according to three different purification principles:
1. Centrifugal cleaning
is the first step in the purification of
the inlet air.
The fins on the flywheel supply the cylinder with cooling air
at the same time as they act as the active part in the centrifugal
cleaning of the engine's inlet air. An inlet nozzle is fitted close to
the fins on the flywheel. The centrifugal force means that large
particles do not follow the curved air currents to the nozzle, but
are thrown to the outside of the nozzle. Only very small dust
particles manage to swing with the air currents to the inlet.
2. Foam plastic filter
is the next level of separation in the
purification process. An air deflector guides and distributes the air
across the whole filter surface, which means that the whole of the
filter is better utilised and is fouled evenly across the surface. The
filter is steeped in oil and is made up of three layers with
different pore sizes.
3. The paper filter
primarily provides effective protection
should the foam plastic filter, on account of inadequate care, lets
dust through.
Filter service
1. Centrifugal cleaning
The inlet duct should be inspected and any deposits removed in
connection with filter replacement. Dust from dry cutting is
cleaned off using compressed air Material from wet cutting
normally needs to be scraped off mechanically.
2. Foam plastic filter
New filters are supplied steeped in the correct amount of filter oil.
The replacement frequency is dependent on a number of factors
and therefore cannot be generally stated. Unfortunately there is no
easy method to assess a used filter's remaining capacity, and it is
even harder when the machine's history is not known. However,
in all safety it can be said that if dust particles can be discerned on
top of the filter (clean side) it is spent.
3. Paper filter
The paper filter should not be cleaned, but is replaced with a new
one. The replacement frequency depends very much on the care of
the foam plastic filter.
Exercise extreme care when the filter is dismantled so that
dust particles do not fall down in the carburettor inlet. Vacuum
cleaning is the best method to remove spillage and to clean the
filter compartment.
A useful rule for filter replacement is: Replace the paper filter
when the yellow paper colour is no longer visible.
