| 摘要 |
PROBLEM TO BE SOLVED: To make the connection to the other directional control valve impossible by providing an operation means for supplying/ discharging pilot oil and a selecting means for selectively connecting this operation means to plural pilot operation directional control valves, and stopping selecting operation in an operation state. SOLUTION: When a switch 10 of a selecting means 8 is turned off when an operation lever 4b of an operation means 4 is put in an operation stopping state, when the selecting means 8 outputs pilot oil to an oil passage 12 by a lever 4b in an illustrated position, a solenoid hydraulically operating valve 9 connects oil to a pilot operation directional control valve 6a via an oil passage 14, connects an oil passage 15 connected to a pilot operation directional control valve 6b to a tank 11 via an oil passage 13, and can operate the directional control valve 6a by the lever 4b. Similarly, when the switch 10 is turned on when the lever 4b is put in an operation stopping state, the directional control valve 6b can be operated by the lever 4b. Even if the switch 10 is turned on and off when the directional control valve 6a or 6b is put in an operation state by the lever 4b, the operating valve 9 is held in the position by a signal oil passage 16 or 17, and selecting means 8 is stopped in selecting operation.
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