OM3070 Operation - Section 30 Operating Instructions Page 30-17 TROLLEY OPERATING INSTRUCTIONS TOWING Prior to towing a truck, many factors must be care- fully considered. Serious personal injury and/or sig- nificant property damage may result if important safety practices, procedures, and preparation for moving heavy equipment are not observed. The instructions provided here are specifically for trolley use. General operating instructions outlined earlier in this chapter apply. NOTE: If the disabled truck is loaded, dump the entire load. Never pull or tow a loaded truck. AFTER THE ENGINE HAS STARTED DO NOT tow the truck any faster than 8 kph (5 mph).
A disabled machine may be towed after adhering to the following minimum precautions. 1. Shut the engine off. Chock wheels on disabled truck to prevent movement while attaching tow bar. When performing the following tests, the truck must be parked and the engine on. Place the master control lever in the DIESEL position. 2. If the truck is equipped, install the hydraulic connections for steering and braking between the towing and towed vehicles. Check the towed vehicle braking system. Perform this test before operating the truck. 3. Determine that the towing vehicle has adequate capacity to both move and stop the towed truck in all conditions. 1.
Depress the leakage current test switch (on instrument panel to right of steering column) and hold in the ON position for 4 seconds. 4. Inspect the tow bar. The tow bar capacity must be approximately 1.5 times the gross vehicle weight of the truck being towed. a. f the system is operating correctly, the trolley fault indicator lamp will turn on. b. If the trolley fault indicator does not light, notify maintenance personnel. The truck can still be operated in the DIESEL position. 5. Block the disabled truck to prevent movement while attaching the tow bar. 6. Release the disabled truck brakes and remove the wheel chocks. 2.
To reset after the trolley fault indicator lamp turns on, move the master control switch to the TROLLEY position for a minimum of 1 second. Then, move the switch back to the DIESEL position. 7. Sudden movement may cause tow bar failure. Smooth and gradual truck movement is preferred.