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11
MS 780, MS 880
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 and check setting of
oil pump if necessary
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
Valve in oil tank blocked
Clean or replace valve
Spur gear broken
Fit new spur gears
Oil pump damaged or worn
Install new oil pump
Machine losing chain oil
Oil pump body damaged
Install new oil pump
Oil pump damaged or worn
Install new oil pump
Oil intake hose connection leaking
or damaged
Install new oil intake hose
Sealing ring on oil pump outlet
damaged or missing
Replace the sealing ring
Oil pump delivers insufficient oil
Oil pump worn
Install new oil pump
Oil pump delivery rate set too low
Adjust oil pump
(only on version with adjustable oil
pump)
Pickup body in oil tank clogged
Clean the pickup body or replace if
necessary.