| 摘要 |
PROBLEM TO BE SOLVED: To enable both first and second actuators to continue to operate by changing the discharge volume of a second pump to low discharge volume before a safety device operates and an electric motor stalls, when an operation is performed in a state that a load of a prescribed value or higher is applied to the first actuator and a load of a prescribed value or higher is applied to the second pump.SOLUTION: A hydraulic controller for deck crane includes a pump regulator 13 which can change the discharge volume of a second pump 62, a first pressure detector 67 which detects the pressure of pressure oil flowing in a motor 2 for hoist, and a second pressure detector 68 which detects discharge pressure of the second pump 62. The pump regulator 13 has an electromagnetic switch (second pump volume switching portion) which changes the discharge volume of the second pump 62 from maximum discharge volume to low discharge volume when the oil pressure detected by the first pressure detector 67 is equal to or larger than first set pressure and the oil pressure detected by the second pressure detector 68 is equal to or larger than second set pressure. |
