Troubleshooting On Chain Oiling System; Removing Oil Pump; Component Parts Of Oil Pump In Correct Sequence; Cleaning The Oil Pump - Stihl 9 Instruction Manual

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Removing oil pump

If you have checked chain lubrication (see chapter "Guide
Bar, Saw Chain and Chain Sprocket") and found that no oil
is being delivered although the oil tank is full, switch off the
engine and start looking for the fault on the cutting attach-
ment.
To do this, remove the chain sprocket cover, guide bar
and chain. Thoroughly clean the oil inlet holes as well
as the passage between the holes and the bar groove. Also
clean away dirt that may have collected at the end of the oil
hose  and the area around it.
Now check oil delivery again. If no oil emerges from
the hose  , the oil pump must be removed from the
machine and cleaned.

Component parts of oil pump in correct sequence

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3
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4
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Drain the chain oil tank. Remove the fastening screws 
and withdraw the oil pump.
If the oil pump is stuck, use a screwdriver to carefully pry it
away from the crankcase.
Pull off the hose  and remove the polymere disc  . Take
the filter  off the stub. Now pull the cover  off the pump
housing, making sure that the diaphragm  does not stick
to the cover and tear.
Take the plunger and diaphragm  out of the pump
housing and remove the two gaskets    Note the
spring  between the pump housing and diaphragm. It
must not be lost.
Carefully wash the pump housing, cover, plunger with dia-
phragm and the filter in clean gasoline. Thoroughly clean
the gaskets and flange faces on the crankcase.
Reassemble the pump by reversing the above sequence.
Coat the plunger with a little lubricating oil before refitting.
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