OM3044 Operating Instructions - Section 30 Page 30-9 SUDDEN LOSS OF ENGINE POWER 2. The parking brake must be applied and/or chocks placed fore/aft of wheels so that the truck cannot roll. Each truck should be parked at a reasonable distance from another. If the engine suddenly stops, there is enough hydraulic pressure stored in the brake and steering accumulators to allow the operation of the steering and brake func- tions. However, this oil supply is limited so it is impor- tant to stop the truck as quickly and safely as possible after the loss of engine power.
If the brake supply pres- sure drops to a pre-determined level, the Low Brake Pressure warning light will illuminate and a buzzer will sound. If the brake pressure continues to decrease, the “Auto-Apply” feature will activate and the service brakes will apply automatically to stop the truck. Apply parking brake as soon as the truck comes to a com- plete stop. 3. Haul roads are not safe parking areas. In an emergency, pick the safest spot most visible to other machines in the area. If the truck becomes disabled where traffic is heavy, mark the truck with warning flags in daylight or flares at night. ENGINE SHUTDOWN PROCEDURE The following procedure should be followed at each engine shutdown.
1. Stop truck. Reduce engine RPM to low idle. Place Selector Switch in NEUTRAL and apply Parking Brake switch. Dynamic retarding will not be available! Do not use the service brakes for continuous retarding purposes. Refer to the “DELAYED ENGINE SHUTDOWN PRO- CEDURE” if the option for a five (5) minute engine idle period is desired. 1. Bring the truck to a safe stop as quickly as possi- ble by using the foot pedal to apply the service brakes. If possible, steer the truck to the side of the road while bringing it to a complete stop. 2. Allow engine to cool gradually by running at low idle for 3 to 5 minutes. 3.
With truck stopped and engine cooled down, turn keyswitch counterclockwise to OFF for normal shutdown of engines. If engine does not shut- down with keyswitch, use Engine Shutdown Switch on the operator's center console (see “Operator Controls” section) and hold this switch down until engine stops. 2. Apply the parking brake as soon as the truck has stopped moving. 3. Turn key switch OFF and notify maintenance per- sonnel immediately. 4. If safe to do so, place wheel chocks in front or behind the wheels so that truck cannot roll. 5. If the truck becomes disabled where traffic is heavy, mark the truck with warning flags in day- light or flares at night. 4.
With keyswitch OFF, and engine stopped, wait at least 90 seconds. Insure steering circuit is com- pletely bled down by turning steering wheel back and forth several times. No front wheel movement will occur when hydraulic pressure is relieved. NOTE: A switch is located at the right front corner of truck for ground level engine shutdown. 5. Close and lock all windows, remove key from key- switch and lock cab to prevent possible unautho- rized truck operation. Dismount truck properly. SAFE PARKING PROCEDURES The operator must continue the use of safety precau- tions when preparing for parking and engine shutdown.
In the event that the equipment is being worked in con- secutive shifts, any questionable truck performance the operator may have noticed must be checked by main- tenance personnel before the truck is released to another operator. 1. The truck should be parked on level ground, if at all possible. If parking must be done on a grade, the truck should be positioned at right angles to the grade.