OIL PASSAGE SWITCHING CONTROL DEVICE FOR WORK VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a simple oil passage switching control device for work vehicle capable of appropriately performing switching control of hydraulic oil supply to a plurality of hydraulic actuators on a traveling body side.;SOLUTION: A second control unit CU2 operates two solenoid valves 135 and 136 in a second control valve CV2 based on a setting state of three switches SW1 to SW3 to control supply of pilot oil to a third control valve CV3. The third control valve CV3 switches a connection state between A port 152, first B port 153 or second B port 154 and P port 151 according to presence or absence of supply of pilot oil to PA port 155 or PB port 156, thereby switching a supply state of hydraulic oil to hydraulic cylinders 61L, 61R, 71L, 71R.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2018,JPO&INPIT