11MS 650, MS 660
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 clogged
or intake hose ruptured
Fit new intake hose and pickup
body
Sealing ring between oil pump and
crankcase faulty
Remove oil pump, fit new sealing
ring and reinstall pump
Valve in oil tank blocked Clean or replace valve
Teeth on pump piston and/or worm
worn
Install new oil pump
Machine losing chain oil Sealing ring between oil pump and
crankcase faulty
Remove oil pump, fit new sealing
ring and reinstall pump
Housing gasket faulty Fit new gasket
Oil pump damaged or worn Install new oil pump
Vent valve does not close Install new vent valve
Oil pump delivers insufficient oil Adjusting screw and/or control
edge on pump piston worn
Fit new adjusting screw and/or oil
pump
Intake hose or pickup body clogged Clean or replace intake hose/
pickup body
Oil pump worn Install new oil pump
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