HYDRAULIC SYSTEM OPERATION (Contd)
d. Medium Wrecker Crane Hydraulic System Operation.
The M936/A1/A2 medium wrecker is equipped with a hydraulically-operated crane that extends a maximum
18 feet (5 meters), elevates 45 degrees, and swings 360 degrees. It is capable of lifting loads up to 20, 000 lbs (9, 090
(1) The crane hydraulic system converts power of the engine into fluid power for use by the hydraulic pump.
At this pump, oil pressure is supplied to different crane control valves: BOOM, HOIST, CROWD, and SWING. Each of
these actions are dealt with separately. The major components for raising and lowering the wrecker boom are: