Pilot Circuit for Working Vehicle

摘要

The machine includes an operation selection switch to choose either an oil-pressured pilot operation or an electric operation, a control device to input an electric signal for traveling transmitted from an electric operation device and a selection signal from the operation selection switch. A third electro-magnetic valve may forbid outputting pilot pressure from a pilot valve, a first to fourth electro-magnetic proportional valve outputting a pilot pressure to the control valve for traveling based on the control signal from the control device and a first to fourth shuttle valve leading the output pilot pressure to the control valve for traveling.

主权项

1. A working vehicle comprising:
a hydraulic motor that drives a traveling apparatus; a control valve for traveling of a hydraulic pilot type that performs oil supply and discharge control for the hydraulic motor; a hydraulic pilot operation tool that actuates a pilot valve that outputs a pilot pressure to the control valve; an electric operation device that outputs an electric signal; operation selecting means for selecting hydraulic pilot operation or electric operation; a control apparatus that receives the electric signal from the electric operation device, and a selection signal from the operation selecting means, and outputs a control signal; an electromagnetic valve for prohibiting pilot pressure from the pilot valve from reaching the control valve for traveling on the basis of the control signal; an electromagnetic proportional valve that outputs pilot pressure to the control valve for traveling on the basis of the control signal from the control apparatus; and a shuttle valve that directs one of the pilot pressure output from the pilot valve or the electromagnetic proportional valve to the control valve for traveling.