| 摘要 |
When simultaneous operation of rotating and arm pulling is detected by a detector, a switching controller recognizes that both signals are output simultaneously, and switches a switching valve to a second position, so that oil flows discharged from a plurality of hydraulic pumps are united and supplied to a rotating motor and an arm cylinder. A meter-in flow controller restricts a quantity of oil supplied to the arm cylinder. Thereby, even where rotating and arm pulling are operated simultaneously, each of operations can be done quickly, and the delay of the rotating operation is overcome, to enable proper rotating and arm pulling operations.
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