STIHL 009, 010, 011 42
7.5 Disassembly and Repai
of Pump Housing
The filter can also be washed in
clean gasoline. However, if it is
saturated with resin it is best to fit a
new filter.
The filter can be removed after taking
off the plastic washer which sits in
the groove of the hose nipple. The
plastic washer is used to locate the
filter element and must not be
forgotten during reassembly.
Important: After installing a new
filter wait at least 5 minutes between
filling up with chain oil and starting.
This period allows the filter to fill with
chain oil, i.e. the lubrication system is
then primed and the saw is ready for
operation.
To remove the pump housing, first
unscrew the three pan head screws.
Pull the pump housing out of the
chain oil tank and disconnect the
delivery hose.
Prise the retaining ring off the pump
housing cover in order to disassem-
ble the pump. The retaining ring is
only fitted for shipment and need not
be refitted when the pump is
assembled.
lean the pump housing by blowing
out the oil hole with compressed air.
Resinous deposits can be cleaned
away with gasoline. Always replace
the diaphragm if it is faulty. When re-
assembling the pump make sure that
the compression spring is fitted bet-
ween the diaphragm and pump
cover, and not between the
diaphragm and the housing as this
would cause the pump to
malfunction.
Removing plastic washe
Top:
Removing retaining ring
Bottom:
Assembly sequence-diaphragm, compression
spring and pump cover
Top:
Removing the oil pump
Bottom:
Disconnecting delivery hose
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