Stihl 029, 039 - 2.5 Chain Lubrication

STIHL 029, 039 11
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 no oil Oil tank empty Fill up with oil
Oil inlet hole in guide bar Clean oil inlet hole
is blocked
Intake hose or pickup body Wash intake hose and pickup
(strainer) clogged or intake body (strainer) in white spirit
hose ruptured and blow out with compressed air;
replace if necessary
Valve in oil tank blocked Clean or replace valve
Teeth on pump piston and/or Fit new oil pump and/or
worm worn new worm
Machine losing chain oil Bore in pump Fit new pump housing
housing worn
Oil pump delivers too Control screw and/or Fit new control screw and/or
little oil control edge on pump piston pump piston
worn
Bore in pump housing Fit new pump housing
worn
2.5 Chain Lubrication