| 摘要 |
PROBLEM TO BE SOLVED: To prevent a leakage of accumulated oil and prolong the time while operation is possible after an engine is stopped. SOLUTION: This hydraulic system of a work vehicle is constituted in such a way that pressure oil from a main hydraulic pump P1 is supplied to right and left running motors 3R and 3L and a work actuator, a selector valve 11 is operated when the left and right running motors 3L, 3R are driven to supply pressure oil from a subhydraulic pump P3 to the work actuator, and signal pressure oil for switching the selector valve 11 returns into an oil tank when the left and right running motors 3L, 3R are not driven. A pilot-operated valve of the work actuator and an unload valve connecting and disconnecting the supply of pressure oil to the pilot-operated valve are provided, and signal pressure oil for the selector valve 11 is supplied from the upstream side of the unload valve. A pressure accumulation part is provided between the unload valve and the pilot-operated valve, and a check valve is provided on the upstream side of the pressure accumulation part so that pressure oil in the pressure accumulation part does not flow as signal pressure oil.
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