| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic system of a work vehicle, which has a simple structure, and can select convergence or non-convergence of pressure oil from a sub-hydraulic pump to pressure oil from a main hydraulic pump to be fed to a service actuator. <P>SOLUTION: The hydraulic system is provided with a main feeding circuit M which can feed pressure oil from the main hydraulic pump p1 to a traveling motor 5 and the service actuator 27 of a hydraulic attachment 26 selectively attached to the work vehicle, and a third connecting oil path k which joins pressure oil from the sub-hydraulic pump p2 with pressure oil flowing in the main feeding circuit M and then leads the mutually joined oil to the service actuator 27. The third connecting oil path k has a check valve q arranged thereacross, and a drain oil path N for draining pressure oil from the sub-hydraulic pump p2 to a tank 41 is connected to an upstream side of the check valve q, followed by arranging a cock v11 in the drain oil path N, for interrupting flowage of the pressure oil to be drained from the sub hydraulic pump p2 to the tank 41, in a manually operable manner. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
