STIHL 064, 066 13
2.5 Chain Lubrication
Important: In the event of trouble with the chain lubrication system, always investigate the other possible sources of faults before
disassembling the oil pump.
Condition Cause Remedy
Chain receives Oil tank empty Fill up with oil
no oil
Oil hose has come off Reconnect hose to pump or
stub on oil pump or fit it in crankcase recess, or
out of crankcase recess, install a new hose.
or hose is damaged*
Sealing ring in crankcase Remove oil pump, fit new
recess is faulty** sealing ring and reinstall
oil pump
Oil inlet hole in guide Clean oil inlet hole
bar is blocked
Intake hose or pickup Wash intake hose and pickup
body (strainer) clogged body (strainer) in white
or intake hose ruptured spirit and blow out with
compressed air; replace if
necessary
Valve in oil tank blocked Clean or replace valve
Teeth on pump piston Fit new pump piston and/or new
and/or worm worn worm
Machine losing Oil hose has come off Reconnect hose to pump or
chain oil stub on oil pump or fit it in crankcase recess, or
out of crankcase recess, install a new hose.
or hose is damaged*
Cylinder bore in pump Fit new pump housing
housing worn
Oil pump delivers Control screw and/or Fit new control screw and/or
too little oil control edge on pump new pump piston
piston worn
Bore in pump housing Fit new pump housing
worn
* Older machines
** New machines
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