24Maintenance chartItem Inspecting RegularityEngine oil Inspection/clean Before commencing workReplace Initially, after 20 operating hours, andsubsequently every 30 operating hoursWheel, tightening bolt, hood Visual inspection Before commencing workThrottle system Functional check Before commencing workAir filter Gently tap or replace. Monthly (every 50 operating hours)Dust bag filter Clean or replace. Weekly (every 20 operating hours)Prefilter Rinse off coarse dirt in running water orreplace, and apply oil.Daily (every 8 operating hours)Spark plug Visual check … Clean, adjust, or replace Implement as you think properV-belt Visually inspect status of wear (takecare about excessive tension at time ofreplacement).Before commencing workFuel tank filter Visually inspect, and replace depending onlevel of dirtiness.Implement as you think properNuts and bolts Visually inspect, and correct. Before commencing workBe sure to use designated and genuine parts and consumables.•Fault locationFault System Observation CauseCutting disc does notstart turningClutch Engine runs Damage to clutchEngine does not startor with difficultyIgnition system Ignition spark O.K. Fault in fuel supply or compression system, mechanical defectNo ignition spark STOP-switch operated, wiring fault or short circuit, spark plug orconnector defective, ignition module faultyFuel supply Fuel tank filled Incorrect choke position, carburetor defective, fuel supply line bent orblocked, fuel dirtyCompression system No compression whenpulled overCylinder bottom gasket defective, crankshaft seals damaged, cylinderor piston rings defective or improper sealing of spark plugMechanical fault Starter not engaging Broken starter spring, broken parts inside of the engineClutch Contaminationadheres to clutch andaround partsRatchet spring contaminated and opened, have it cleanedWarm start problems Carburetor Tank filled, ignitionspark existingCarburetor contaminated, have it cleanedEngine starts, but diesimmediatelyFuel supply Tank filled Incorrect idling adjustment, suction head or carburetor contaminatedFuel tank vent defective, fuel supply line interrupted, cable or STOP-switch faultyInsufficientperformanceSeveral systems maysimultaneously beaffectedEngine idling poor Air filter contaminated, carburetor contaminated, muffler clogged,exhaust duct in the cylinder clogged