Control change system for a hydraulic working vehicle

Details Control change system for a hydraulic working vehicle Control change system for a hydraulic working vehicle

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/02 (2006.01) E02F 9/20 (2006.01) E02F 9/22 (2006.01) E02F 9/28 (2006.01) G05G 9/04 (2006.01)

Patent

CA 2041614

A control change system for a hydraulic working vehicle having a plurality of hydraulic actuators operable by control levers each shiftable to a plurality of control positions. This system includes a plurality of pilot-operated control valves for controlling pressure oil supply to the hydraulic actuators, respectively, pilot pressure generating valves for generating a pilot pressure in accordance with the control positions of the control levers, and a pilot pressure switching unit for receiving the pilot pressure from the pilot pressure generating valves and outputting the pilot pressure selectively to the control valves. The pilot pressure switching unit includes a plurality of spools slidable to change communicating passages between a pilot pressure input section and a pilot pressure output section of the switching unit.

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