Working machine lifting control system for agricultural work vehicle

摘要

PROBLEM TO BE SOLVED: To provide an implement elevation controller of a working vehicle, which uses an inexpensive and highly reliable system wherein the elevation of a mechanically operable position control valve is controlled with a mechanical position control link, and the similar speed reduction can also be performed even in other implement-lowering operations using a motor during the operation of a position lever.;SOLUTION: This implement elevation controller of the working vehicle is characterized by connecting a means for detecting the elevation height of the implement 14, a normally or reversely rotatable motor 95 connected to the position control valve 90 through a link, and an elevation switch disposed in an elevation operation means, to a control means 60, wherein the electric motor 95 has a connection structure which decontrols in the lifting direction of the position control valve 90 and controls in the lowering direction, and the electric motor 95 is operated at a position for controlling the lowering direction hydraulic flow quantity of the position control valve 90 in response to the elevation position of the implement 14 without relating to the position of the position lever 20, thereby enabling to reduce the speed on the lowering of the implement.;COPYRIGHT: (C)2008,JPO&INPIT