OM3054 03/13 Operating Instructions - Section 30 Page 30-21 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 another source. The tow machine or an auxiliary power unit must be used to supply hydraulic power. Hydraulic power is necessary for dumping, steering and braking. Hydraulic power is also neces- sary to release the spring applied parking 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 and procedures are not observed. 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 drive axles must be removed before towing. Refer to Section G, Final Drive, in the shop manual for more information.
Wire rope capable of towing 77,110 kg (170,000 lb) is required for the HD1500. An observer must be positioned in a safe location during towing for signalling the operators. Towing speed must not exceed 2 kph (1 mph). Tow rope angles must not exceed 10°. Observe all precautions outlined in this manual, as well as local regulations. Refer to the follow- ing steps when towing is necessary: Extensive secondary damage may occur to final drive components and/or the transmission, if the truck is towed with- out first removing the drive axles. 1. Block the disabled truck to prevent movement while preparing the truck for towing and attach- ing the wire rope and other connections.
Remove damaged components and any debris before moving the truck. Failure to remove debris or damaged components may result in further damage. 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 the drive axles were removed, it is not necessary to remove the drive shaft. 4. Use the tow eyes installed under the front bumper for towing from the front of the disabled truck. Both tow hooks must be used.
Use the tow pin on the rear axle when pulling the dis- abled truck from the rear.