29State of abnormality Probable cause (malfunction) RemedyCutter blade does notrotateLoosened cutter blade-tightening nut Tighten securelyTwigs caught by cutter blade ordispersion-preventing cover Remove foreign matterAbnormal drive system Make request for inspection andmaintenance.Main unit vibratesabnormally.Broken, bent or worn cutter blade Replace cutter bladeLoosened cutter blade-tightening nut Tighten securelyShifted convex part of cutter blade andcutter blade support fitting Attach securelyAbnormal drive system Make request for inspection andmaintenance.Cutter blade does notstop immediately.High idling rotation AdjustDetached throttle wire Attach securelyAbnormal drive system Make request for inspection andmaintenance.Engine does not stop. Detached connector Attach securelyAbnormal electric system Make request for inspection andmaintenance.Stop engineimmediatelyStop engineimmediatelyStop engineimmediatelyRun engine at idling,and set choke leverto CLOSE.When the engine does not start after warm-up operation:If there is no abnormality found for the check items, open the throttle by about 1/3 and start the engine.