Patent ID: 7513109

Claim:
A hydraulic controller for a working machine comprising: a pilot pressure input unit; a plurality of pilot-operated hydraulic devices adapted to be operated remotely by switching between a supply of an input signal of a pilot pressure and a stop of the supply to said pilot pressure input unit and provided with mutually different pilot pressure input conditions; a pilot hydraulic pressure source connected in common to each pilot pressure input unit of said pilot-operated hydraulic devices; a pilot pressure input switching valve provided in common for said pilot-operated hydraulic devices and adapted to be switchable between a pilot pressure input position where to input a pilot pressure from said pilot hydraulic pressure source to each pilot pressure input unit of said pilot-operated hydraulic devices and a pilot pressure relief position where to relieve said pilot pressure; and switching control means for controlling a switching of said pilot pressure input switching valve based on the operating state of said working machine and the pilot pressure input conditions of said respective pilot-operated hydraulic devices, wherein one of said pilot-operated hydraulic devices is given priority for pilot pressure input control as compared to at least another one of said pilot-operated hydraulic devices, and wherein said switching control means is adapted to control the switching of said pilot pressure input switching valve while giving preference to the pilot pressure input conditions of said one of said pilot-operated hydraulic devices based on said priority.