2-19. Operation of Tractor Wrecker Trucks.
a. General. Tractor wrecker trucks covered in this manual are equipped with a hydraulicallv
powered, engine-driven crane. The crane is capable of 360 rotation and approximately 456
elevation. The crane boom is extendable in three positions from 11 1/2 to 26 feet. Maximum
lifting capacity with outriggers installed is 10,000 pounds. The fifth wheel assembly mounted
on the rear of the chassis is designed to haul flatbed trailers with a maximum load of 20,000
pounds during cross-country operations, and 46,000 pounds during highway operations.
The tractor wrecker truck is equipped with a transfer power takeoff. The transfer
can be operated in NEUTRAL as long as the power takeoff is engaged. Never
disengage the power takeoff when the transfer is in NEUTRAL, since this will
disengage the power takeoff pump which supplies bearing lubrication.
General instructions for winching, towing, and lifting are given in FM 20-22.
b. Positioning Wrecker. Position the wrecker on firm level ground whenever possible.
Determine which type of lifting is necessary (i.e., rear lift, lift and swing, heavy rear lift or a
heavy side lift) and position the wrecker accordingly. For heavy loads, the wrecker should be
positioned for a direct rear lift with the least amount of boom extension.
Refer to the safe load data plate located near the crane controls. Select the lifting
method (with or without outriggers) and crane radius that will permit crane
operation within safe limits while lifting the load. Position the wrecker close
enough to the load to operate the crane at the radius you have selected. Measure
radius horizontally, regardless of boom angle or extension.