Stihl FS 90 R Product Instruction Manual - Page 46

English Maintenance and Care The following maintenance intervals apply in normal operating conditions. The specified intervals must be shortened accordingly when working for longer than normal or under difficult cutting conditions (extensive dust, etc.). Complete machine visual inspection (condition, leaks) clean X X X Control handle check operation X X Air filter Fuel pick-up body in fuel tank clean replace have checked by a specialist dealer 1) have them replaced by a specialist dealer 1) Fuel tank clean Carburetor check idle adjustment, cutting attachment must not turn X X readjust idle speed Spark plug adjust electrode gap replace after every 100 hours of operation visual inspection X Cooling air intakes clean Valve clearance check and adjust if necessary, one time after 139 hours of operation, by servicing dealer1) Combustion chamber decarbonize after 139 hours of operation, subsequently after every 150 hours of operation check X Spark arresting screen in muffler clean or replace All accessible screws, nuts and bolts (not adjusting screws) retighten 44 before starting work at the end of work and/or daily whenever tank is refilled weekly monthly yearly if faulty if damaged as required X X X X X X X X X X X X X X X X X FS 90, FS 90 R