MACHINE OPERATIONS AND CONTROLS OPERATION Charge level monitor (4) Engine oil pressure monitor (5) Engine water temperature monitor (7) Fuel level monitor (8) 2) Turn lamp switch (9) to turn on the head lamps and working lamp. If the lamps do not light up, there is probably a bro- ken bulb or disconnection in the wiring, so contact your Komatsu distributor for repairs. 4. Press horn switch (10) and check that the horn sounds. 3-46