| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the load of the actuator of a working machine side from acting on a running side actuator. SOLUTION: This system is provided with a first operation valve 2 for supplying the delivery pressurized oil of a first hydraulic pump 6 of a plurality of hydraulic pumps to a first actuator, a second operation valve 3 for supplying the delivery pressurized oil of a second hydraulic pump 8 to a second actuator, third operation valves 4, 5 for supplying the delivery pressurized oil of a third hydraulic pump 12 to the third actuator group of a working machine, a join/ separate valve 1 for joining/separating the delivery pressurized oil of first/second both hydraulic pumps 6, 8 and an open/close valve 10 for communicating/ intercepting the delivery route of one side hydraulic pump of first/second hydraulic pumps 6, 8 with the delivery route 13 of a third hydraulic pump 12. The open/close valve 10 always stays on a communication position F, and is positioned to an intercept position G when the pump pressure of the third hydraulic pump 12 exceeds the set pressure set by a relief valve 30.</p> |
