| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple counterweight mounting/demounting control circuit capable of controlling a plurality of counterweight mounting/demounting operations in predetermined operation sequence, and to provide a work machine on which the control circuit is mounted.SOLUTION: Control means 60 uses solenoid valves 63, 65, 67, 69 for pilot-controlling a lower cylinder logic valve 51, a lift cylinder logic valve 52 and a valve device 28. During demounting a counterweight, the control means 60 automatically changes over the counterweight move-up operation of a lift cylinder 20 into the counterweight move-down operation of a lower cylinder 23 on the basis of a detection signal from a second pressure sensor 49. During mounting the counterweight, the control means 60 automatically changes over the counterweight move-up operation of the lower cylinder 23 into the counterweight move-down operation of the lift cylinder 20 on the basis of a detection signal from a first pressure sensor 48. |
