Operating Instructions - Section 30 03/13 OM3040 Page 30-18 TOWING 3. Determine the primary reason that the truck is disabled. a. If the truck is being towed because of engine failure, certain precautions must be observed. The loss of hydraulic power due to engine failure requires the use of hydraulic power from the tow machine, or an auxiliary power unit, to supply hydraulic power. Hydraulic power is necessary to dump a load before towing, for steering and braking func- tions, and to release the spring applied park- ing brake. Refer to Disabled Truck Dumping and Disabled Truck Steering and Braking in this chapter for more information on hookup.
Prior to towing a truck, many factors must be carefully considered. Serious personal injury and/or significant property damage may result if important safety practices, procedures, and preparation for moving heavy equipment are not observed. Always use extreme care when towing a disabled truck. Towing a machine is only advised for short distances. For longer distances, the machine must be hauled. All precautions must be observed to protect the operators in the event of wire rope breakage. b. If the truck is disabled because of a sus- pected final drive problem, both right and left planetary sun gears/drive axles must be removed before towing.
(Refer to Section G, Final Drive, in the shop manual for more information.) For the HD1500-5, wire rope capable of towing 77 110 kg (170,000 lb) is required. An observer must be positioned in a safe location during towing for signalling to the operators. Towing speed must not exceed 2 km/h (1 mph). Tow rope angles must not exceed 10°. Extensive secondary damage may occur to final drive components and/or the transmission, if the truck is towed without first removing the sun gears/drive axles. Observe all precautions outlined in this manual, as well as local regulations. Refer to the follow- ing steps when towing is necessary:
Ensure all debris and damaged components have been removed before moving the truck. Failure to remove debris or damaged components may result in further damage. 1. Block the disabled truck to prevent movement while preparing the truck for towing and attach- ing the wire rope and other connections. 2. Verify the towing capacity of the wire rope (it must be capable of towing 77 110 kg (170,000 lb). Verify the rope is in good condition showing no indications of damage or wear. c. If the truck is disabled because of a sus- pected transmission problem, remove the drive shaft between the transmission and the differential case (if final drive sun gears have not been removed).