| 摘要 |
There are provided: control valves 22 - 24 that control flow of pressure oil from the hydraulic source 21 to the hydraulic actuators 15 - 17; electric lever devices 51 - 53 that output electrical operation signals, which are drive instructions for the hydraulic actuators 15 - 17, in correspondence to lever operation; and a control unit 25 - 30 and 50 that controls the control valves 22 - 24 in correspondence to the operation signals. When the determination unit determines that an operation signal is not within the normal range, the hydraulic actuators 15 - 17 are allowed to be driven with flow of pressure oil to the hydraulic actuators 15 - 17 limited more significantly than in a case where it is decided that an operation signal is within the normal range. |
