STIHL 009, 010, 011 40
7.2 Troubleshooting Chart
In the event of difficulties with the
chain oil supply, always investigate
and rectify the other possible sources
of faults before disassembling the oil
pump.
Remedy
Fill up with oil
Clean oil inlet hole
Wash out plunger guide bore
and filter in clean gasoline
and blow out with compressed
air; replace if necessary
Wait approx. 5
minutes until filter is
saturated
Fit new crankcase
Replace seals
Replace diaphragm with plunger
Replace pump housing together
with diaphragm and plunger
Cause
Oil tank empty
Oil inlet hole in guide bar
is blocked
Plunger guide bore or filter
blocked or delivery hose
cracked
New filter installed
Cracks in crankcase
Seals on pump housing faulty
Diaphragm faulty
Plunger guide in pump housing
worn or dirty
Fault
No oil supply to chain
Machine loses chain oil
Oil pump delivers too little oil
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