OPERATION OPERATION DOES THE HORN SOUND NORMALLY? Check that the horn sounds. If it does not sound at all or the sound is extremely feeble, a defect or broken wire is suspected, ask your Komatsu distributor for possible repairs. 1. Insert the key into starting switch and turn the key to the ON position. 2. Push the horn switch and check that the horn sounds. CHECK BACKUP ALARM SOUND Check that the backup alarm sounds normally. If it does not, a defect or broken wire is suspected, ask your Komatsu distributor for possible repairs. 1. Insert the key into starting switch and turn the key to the ON position. 3-52