12. OPERATION CHECK THAT LAMPS LIGHT UP 1. Turn the key of starting switch to the ON position. OFF ON START 2. Turn the front lamp and working lamp switch to the ON position and check that the front lamps and working lamp light up. 3. Turn the rear lamp switch to the ON position and check that the rear lamps on the left and right fenders light up. If the lamps do not light up, there is probably a broken bulb or disconnection in the wiring, so contact your Komatsu distributor for repairs. CHECK HORN SOUND 1. Turn the key of starting switch to the ON position. OFF ON START 2. Press the horn switch and check that the horn sounds. 2-41