Crane apparatus having hydraulic control system.

摘要

A crane apparatus having a hydraulic system for controlling the operation of the hoist and bridge, and gantry drive functions of the equipment. The hoist, bridge and drive components are driven by an AC motor that is powered by an AC generator. The AC motor in turn operates a variable displacement hydraulic pump which is variable from zero to a maximum flow rate in either direction for infinite speed control. The output of the hydraulic pumps is directed to respective hydraulic motors which drive the particular function being controlled.