| 摘要 |
PURPOSE:To prevent the occurrence of noise by a method in which a hydraulic crane vehicle and a hydraulic pump device are separately provided, and during the working period, the pump device is connected to the hydraulic device of the crane vehicle. CONSTITUTION:During the period when a crane vehicle is run to a working site, a hydraulic pump device 1 is separated from the crane. On the working site, the pump device 1 is attached to the bracket 20 of the crane vehicle, pipes are connected, and the motor is operated by supply of power from the power line to operate the hydraulic device. Since the engine of the crane vehicle is stopped and the power is supplied from the motor instead of the engine, the occurrence of noise during the working period can be prevented. |
