Stihl HL 91 K Instruction Manual - Page 28

English Maintenance and Care The following intervals apply for normal operating conditions. The specified intervals must be shortened accordingly when working for longer than normal or under difficult cutting conditions (extensive dust, etc.). Before starting work At the end of work and/or daily Whenever tank is refilled Weekly Monthly Annually If faulty If damaged As required Complete machine Control handle Air filter Fuel tank Manual fuel pump (if present) Fuel pickup body in fuel tank Carburetor Spark plug Intake port for cooling air Cylinder fins Spark arresting screen in muffler Spacer molded to the cover 26 Visual inspection (safe condition, leaks) X X Clean X Replace any damaged parts X Function test X X Visual inspection Clean the filter housing Replace the felt filter1) Clean check X Have repaired by a specialist dealer2) Have checked by dealer2) Have replaced by servicing dealer2) Check idle setting, the cutting blades must not move X X Adjust idle speed Set electrode gap Replace after every 100 hours of operation Visual inspection X Clean Have cleaned by dealer2) Check X Clean or replace Check5) X Have hood replaced by dealer2) X X X X X X X X X X X X X X X X X X X X X X HL 91 K