Chain Lubrication - Stihl 029, 039 Service Manual

STIHL 029, 039
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
Chain receives no oil
Machine losing chain oil
Oil pump delivers too
little oil
Cause
Oil tank empty
Oil inlet hole in guide bar
is blocked
Intake hose or pickup body
(strainer) clogged or intake
hose ruptured
Valve in oil tank blocked
Teeth on pump piston and/or
worm worn
Bore in pump
housing worn
Control screw and/or
control edge on pump piston
worn
Bore in pump housing
worn
Remedy
Fill up with oil
Clean oil inlet hole
Wash intake hose and pickup
body (strainer) in white spirit
and blow out with compressed air;
replace if necessary
Clean or replace valve
Fit new oil pump and/or
new worm
Fit new pump housing
Fit new control screw and/or
pump piston
Fit new pump housing
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