9MS 290, MS 310, MS 390
4.3 Chain Lubrication
In the event of trouble with the chain
lubrication system, check and
rectify other 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 is
blocked
Clean oil inlet hole
Intake hose or pickup body
(strainer) clogged or intake hose
ruptured
Replace suction hose and pickup
body
Sealing ring between oil pump and
elbow connector or between elbow
connector and engine housing
faulty
Remove oil pump, fit new sealing
ring and refit oil pump
Valve in oil tank blocked Clean/replace valve
Teeth on pump piston and/or worm
worn
Fit new oil pump
Machine losing chain oil Sealing ring between oil pump and
elbow connector or between elbow
connector and engine housing
faulty
Remove oil pump, fit new sealing
ring and refit oil pump
Oil pump damaged or worn Fit new oil pump
Oil pump delivers insufficient oil Control screw and/or control edge
on pump piston worn
Replace control screw and/or oil
pump
Oil pump worn Fit new oil pump
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