Online version - not for reprint
11MS 270, MS 280
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
Wash intake hose and pickup body
(strainer) in fresh STIHL cleaner or
replace if necessary
Valve in oil tank blocked Clean or replace valve
Teeth on pump piston and/or worm
worn
Install new oil pump and/or new
worm
Oil pump hoses blocked/damaged Clean or replace hoses
Machine losing chain oil Oil pump hoses porous/ruptured Fit new hoses
Bore in pump housing worn Fit new oil pump
Oil pump delivers insufficient oil Pump piston worn Fit new oil pump
Oil pump hoses not installed
correctly/leaking/ruptured/blocked
Check correct installation of hoses
or clean/replace hoses
Bore in pump housing worn Fit new oil pump
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