STEERING DEVICE FOR AGRICULTURAL WORK MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a steering device for an agricultural work machine capable of performing an automatic steering and a manual steering stably. SOLUTION: A hydraulic circuit is provided with an automatic steering valve 66 switching the supply of a pressure oil to a hydraulic actuator 24 for steering by automatic control so as to maintain the course of a previously prescribed direction; a manual steering valve 22 switching the supply of the pressure oil to the hydraulic actuator 24 for steering according to the operation of a steering wheel; and a manual/automatic switching valve 67 sending the pressure oil from a pressure oil supply source to the automatic steering valve 66 and returning the returning oil from the automatic steering valve 66 to an oil tank when the automatic steering valve 66 is in an output state, and switching an oil passage so as to return the pressure oil from the pressure oil supply source 62 to the oil tank or send to the manual steering valve when the automatic steering valve is in a neutral state.