Operation - Section 30 OM3043 06/06 Page 30-10 Operating Instructions 3. Empty all material from dump body of truck that is to be towed. 2. Allow the engine to cool gradually at low idle for three to five minutes. 4. Determine that the towing vehicle has adequate capacity to both move and stop the towed truck in all conditions. 3. With the truck stopped and the engine cool, turn the key switch counterclockwise to OFF for nor- mal shutdown of the engine. If the engine does not shutdown with the key switch, use the engine shutdown switch on the center console (see Operator Controls section). 5. Inspect the tow bar.
The tow bar capacity must be approximately 1.5 times the gross vehicle weight of the truck being towed. 6. Block the disabled truck to prevent movement while attaching the tow bar. 4. With the key switch OFF and the engine stopped, wait at least 90 seconds. Ensure the pressure is relieved in the steering circuit by turning the steering wheel back and forth sev- eral times. No front wheel movement will occur when hydraulic pressure is relieved. 7. Release the disabled truck brakes and remove the wheel chocks. 8. Sudden movement may cause tow bar failure. Smooth and gradual truck movement is preferred. 5.
Close and lock all windows, remove the key from the key switch, and lock the cab to prevent possible unauthorized truck operation. Dis- mount the truck properly. 9. Minimize the tow angle at all times. DO NOT exceed 30°. The towed truck must be steered in the direction of the tow bar. SAFE PARKING PROCEDURES DELAYED ENGINE SHUTDOWN PROCEDURE The operator must continue the use of safety precau- tions when preparing for parking and engine shut- down. Refer to Section 32, Operator Cab and Controls, for identification of the various switches and indicator lights.
In the event that the equipment is being worked in consecutive shifts, any questionable truck perfor- mance the operator may have noticed must be checked by maintenance personnel before the truck is released to another operator. 1. Stop the truck. The truck must be away from other traffic, on a level surface, and away from overhead power lines or other obstructions. 1. Park the truck on level ground, if possible. If parking on a grade, position the truck perpen- dicular to the grade. 2. Reduce the engine speed to low idle. 3. Place the selector switch in NEUTRAL. 4. Apply the parking brake switch.
Ensure the parking brake applied indicator light in the over- head display panel is illuminated. 2. Apply the parking brake and install wheel chocks so that the truck cannot roll. Park each truck a safe distance from one another. 5. Move the top of the engine shutdown switch to the ON (center) position. Then, firmly press the switch to the MOMENTARY (upper) position. Hold this position briefly to activate the five minute idle timer. The switch is spring-loaded and will return to the ON position when released. 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, mark the truck with warning flags in daylight, or flares at night. ENGINE SHUTDOWN PROCEDURE The following procedure must be followed at each engine shutdown. 1. Stop the truck. Reduce the engine rpm to low idle. Place the selector switch in NEUTRAL and apply the parking brake switch. If the engine shutdown with timer delay is preferred, refer to the Delayed Engine Shutdown procedure.