CRANE HOOK HORIZONTAL MOVEMENT CONTROL DEVICE

PROBLEM TO BE SOLVED: To enable predetermined control even when a hook horizontal movement control device is equipped to an article wherein hydraulic oil is supplied from a hydraulic pump 6 shared by an expansion control valve 4 and a winch control valve 7 in a line by feedback controlling a control valve in a side where feedback control is not conducted only to a control valve throttling side under specified conditions, or an article wherein both of the expansion control valve 4 and the winch control valve 7 has no pressure compensating valve. SOLUTION: A controller is structured to calculate detected boom length, a detected boom derricking angle, and a deviation from an initial value of the calculated ground level of a hook obtained as a function of detected wire length, and to conduct feedback control for solving the deviation, in a computing calculation process of controlling quantity of one of the expansion control valve 4 and the winch control valve 7. When the deviation from the initial value of the calculated ground level exceeds a specified value that can be solved by changing the control quantity of the other control valve, the controller intervenes a calculating process of the control quantity of the other control valve to decrease the control quantity of the other control valve.