STEERING SYSTEM FOR WORKING VEHICLE

摘要

A priority valve 7 is disposed between a hydraulic pump 2 and a steering valve 4. The priority valve 7 is used to supply by priority steering cylinders 103a and 103b with pressurized oil discharged from the hydraulic pump 2 by controlling the differential pressure across a meter-in hydraulic line of the steering valve 4 such that the differential pressure is kept at a target value. A pressure sensor 31 for detecting the load pressures of the steering cylinders 103a and 103b is provided. On the basis of the load pressures detected by the pressure detection means, the target value set for the priority valve 7 is modified by control means including a controller 32, a solenoid valve 33, a pilot hydraulic line 29, and a pressure receiving unit 24c of the priority valve 7. The above configuration enables suppression of a shock occurring at the start of turning the steering wheel.