Operating Instructions - Section 30 03/13 OM3054 Page 30-6 Jump Starting The truck cannot be push started. Transmission lube and control systems are inoperative when the engine is not on. EMERGENCY STEERING SYSTEM Operation This truck is equipped with an emergency steering system. This system is a backup in the event of loss of oil supply to the main steering system. The emergency steering system was designed to meet or exceed SAE J1511 and ISO 5010 standards. When jumping battery power from one truck to another, all switches must be OFF prior to making any connections. Check connections for correct polarity.
Connect one lead of the booster cable to the 24V positive (+) post of battery needing assist, and the other lead of the booster cable to the 24V positive (+) post of the auxiliary battery. Connect one lead of the second booster cable to the 24V negative (-) post of the auxiliary battery and then connect the other lead of the booster cable to a good frame ground on the disabled truck, away from the battery needing assist. This procedure will avoid the possibility of causing sparks near the battery where explosive gases may be present. If the low steering system pressure indicator light and alarm are activated, a failure in the hydraulic oil supply to the steering and brake system exists.
When the alarm is activated, typically there is enough hydraulic pressure stored in the brake and steering accumulators to allow brief operation of the steering and brakes. However, this oil supply is limited. Therefore, it is important to stop the truck as quickly and safely as possible after the alarm is first activated. If the oil supply pressure drops to a predetermined level, the low brake pressure warning light will also illuminate. If the oil pressure continues to decrease, the brake auto-apply feature will activate the service brakes to stop the truck. NOTE: HD1500 trucks are equipped with four 12 volt batteries connected in series and parallel to provide 24 volt output.
Maintain correct voltage and polarity when connecting booster cables. Damage to electrical components may result if voltage and polarity are not correct. Pre-Operation Testing Komatsu recommends that operators perform this test to verify that the steering accumulator precharge pressure is adequate at the beginning of each shift before operating the truck. 1. Park the empty truck on flat, level ground. Lower the dump body onto the frame and stop the engine. Verify that the key switch is in the OFF position. 2. Wait at least 90 seconds to verify that all hydraulic pressure has been relieved from the steering accumulators. Turn the steering wheel from stop to stop.
If the front wheels do not move, there is no hydraulic pressure. 3. Check the hydraulic tank oil level. The oil level must be visible in the center of the upper sight glass and must not cover the entire upper sight glass. Add oil if necessary. Do not overfill.