| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent the simultaneous drive of work operations such as a running operation and a crane operation or an outrigger stretching operation in a travelling crane. SOLUTION: In this hydraulic device for a travelling crane, the supply of hydraulic pressure for running motors 23, 24 and the supply of hydraulic pressure for crane operating cylinders 27, 28, hydraulic motors 29, 30, and outrigger cylinders 31 to 34 are switched by a selector valve 22. The switching control of the selector valve 22 is done by a limit switch which is changed over in the interlocking relationship with a position of a running layer unit capable of being switched to a rising position and a falling-down position.
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