A work vehicle including a control device for moving an implement through a mechanism including an adjustment mechanism for locking the work implement unit with a predetermined stroke position including a rod, a cam engaging unit mounted on the rod and a cam for producing rotation with the cam engaging unit. The cam retains the work implement in a retaining position through first operational movement of the control device for moving the work implement unit from a basic position to a far side position beyond the retaining position and then returning the work implement unit to the retaining position, and allows the work implement unit to return to the basic position through a second movement control device.
