| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject control unit so designed that the ascending/descending action of a traveling machine body on the steering operator seat side is reduced so as to improve traveling comfort, and in taking action for vehicle height control (tilt control), a control valve for the action of the lift control of a reaping unit is furnished on a partial flow hydraulic control circuit as the side slight in the vehicle height control action to ensure the action of vehicle height control (tilt control) not to be significantly affected by the ascending/ descending action of the reaping unit. SOLUTION: This hydraulic control unit has such a scheme that, traveling units on both left and right sides with respect to a traveling machine body with the front portion equipped with a reaping pretreatment unit are subjected to ascending/descending driving with left and right hydraulic cylinders 54a, 54b, respectively, to keep the vehicle height and the left and right tilt posture of the traveling machine body at respective specified modes, and a hydraulic cylinder 9 is set in motion for keeping the reaping pretreatment unit at a specified reaping height; wherein the pressure oil from the hydraulic pump 60 on a hydraulic control circuit is divided into a 1st partial flow hydraulic control circuit 61 for driving the hydraulic cylinder 54b on the steering seat side via a partial flow valve 63 and a 2nd partial flow hydraulic control circuit 62 for driving the hydraulic cylinder 54a on the side opposite to the steering seat side; in this case, the 1st partial flow hydraulic control circuit 61 is disposed with a solenoid control valve 68 for the hydraulic cylinder 54b on the steering seat side as the side slight in actuation and another solenoid control valve 65 for the hydraulic cylinder 9.
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