Stihl MS 311 User Manual - Page 11
Chain Lubrication
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3.3 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 Cause Remedy 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 Fit new intake hose and pickup or intake hose ruptured body Valve in oil tank blocked Clean or replace valve Teeth on worm worn Install new worm Worm drive spring broken Install new worm Oil pump damaged or worn Install new oil pump Machine losing chain oil Oil pump body damaged Oil pump damaged or worn Oil intake hose connection damaged Install new oil pump Install new oil pump Install new oil intake hose Oil pump delivers insufficient oil Oil pump worn Install new oil pump Worm drive spring not engaged in Engage drive spring in notch in clutch drum clutch drum Oil pump delivery rate set too low Adjust oil pump (only on version with adjustable oil pump) 10 MS 311, MS 391