| 摘要 |
PURPOSE:To improve the efficiency of the whole cultivating work by exceedingly reducing the by allowing a cultivating device installed onto a machine body to lift up from the ground, interlocking with the switching operation to the increased speed drive side of a front wheel speed change gear. CONSTITUTION:A limit switch 37 is arranged for the outside edge of an operating shaft 31, and connected with a control device 38. The controller 38 elevation- operates a rotary cultivating device 14 by a control valve 39 for a lift cylinder 28 so that the cultivation depth by the rotary cultivating device 14 is made constant, and when the operation shaft 31 is operated in sliding and the limit switch 37 is operated to the ON-state, namely when a front wheel speed change gear is operated to the increased speed drive side, the controller 38 selection- operates the control valve 39 to the pressurized oil feeding side, and the rotary cultivating device 14 is lifted up from the ground by the lift cylinder 28.
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