Stihl MS 171 Manual page 11

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
Chain receives no oil
Machine losing chain oil
Oil pump delivers insufficient oil
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Cause
Oil tank empty
Oil inlet hole in guide bar is
blocked
Intake hose or pickup body clogged
or intake hose ruptured
Valve in oil tank blocked
Teeth on worm worn
Oil pump damaged or worn
Oil intake hose not properly fitted or
damaged
Oil pump body (engine housing)
damaged
Oil pump damaged or worn
Oil intake hose connector damaged Install new oil intake hose
Oil intake hose not properly fitted or
damaged
Oil pump worn
Oil intake hose not properly fitted or
damaged
Unsuitable chain lubricant has been
used
.
Remedy
Fill up with oil, check oil pump
Clean oil inlet hole
Fit new intake hose and pickup
body
Clean or replace valve
Install new worm
Install new oil pump
Fit oil intake hose properly or install
new hose
Check engine housing and oil
pump and replace if necessary
Install new oil pump
Fit oil intake hose properly or install
new hose
Install new oil pump
Fit oil intake hose properly or install
new hose
Drain unsuitable chain lubricant
from oil tank and fill up with
recommended chain lubricant
MS 171, MS 181, MS 211