| 摘要 |
PROBLEM TO BE SOLVED: To provide a working machine constituted to reuse oil accumulated in an accumulator while recovering potential energy possessed by a lifting/lowering working part and accumulating the energy in the accumulator, wherein pressure oil is prevented from being left accumulated in the accumulator for a long period when the working machine is not used for a long period. SOLUTION: The system is provided with a discharge oil passage from an accumulator to an oil tank, a tank check valve for opening/closing the discharge oil passage and an accumulator discharge control part 64 for executing opening/closing control of the tank check valve. When an engine key switch 62 is turned "OFF", the tank check valve is opened so as to automatically discharge accumulated oil in the accumulator to the oil tank. COPYRIGHT: (C)2008,JPO&INPIT |
