| 摘要 |
PROBLEM TO BE SOLVED: To remove bubbles while shortening the hydraulic piping of a power steering mechanism. SOLUTION: The hydraulic system is provided with at least two hydraulic pumps, these hydraulic pumps 20A and 20B are connected to a transmission case 4 with a suction piping 97, and the hydraulic oil in the transmission case 4 is sucked and supplied to control valves for controlling the hydraulic action parts placed at several points of the machine body. The suction metal 121A of the first hydraulic pump 20A and the suction metal 121B of the second hydraulic pump 20B are connected in the order to the outlet-side of the suction piping 97, and the return line 124 of the power steering mechanism is connected to the suction metal 121A of the first hydraulic pump 20A. COPYRIGHT: (C)2007,JPO&INPIT
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