| 摘要 |
A guidance system for a tractor including a valve coupled to a source of hydraulic fluid on the tractor and the power steering mechanism of the tractor. A furrow guide is also coupled to the valve for following a preformed furrow and guiding the tractor for digging subsequent furrows. Both the guide and the valve are disposed along the centerline of the tractor. The valve includes means to selectively supply fluid to the power steering mechanism of the tractor and receive fluid therefrom in response to deviations from the centerline of the guide as the guide moves along the furrow. Optionally, means may be provided for digging a perfect furrow to be used as a guide in digging subsequent furrows.
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