| 摘要 |
PROBLEM TO BE SOLVED: To provide a work machine in which: even when a coupling mechanism between an arm and an attachment is stuck and clogged with mud or the like, the detachability of the coupling mechanism is ensured.SOLUTION: A work machine comprises a first hydraulic pump Pthat supplies a line pressure for drive to a hydraulic actuator of a loader device and the like and a second hydraulic pump Pthat supplies a signal pressure for control to an operation device 30 and the like. An attachment/detachment switching valve 45 of a quick hitch mechanism supplies hydraulic fluid at a signal pressure supplied from the second hydraulic pump Pto a bottom-side fluid chamber 55a of a quick hitch cylinder 55 to lock the attachment when an attachment operation switch 35 is at the locking position and supplies hydraulic fluid at a line pressure supplied from the first hydraulic pump Pto a rod-side fluid chamber 55b of the quick hitch cylinder to unlock the attachment when the operation switch 35 is at the unlocking position. |
