| 摘要 |
An apparatus is disclosed having hydraulic means for exerting a variable downward force on the tongue of a tractor drawn implement to optimize the tractive pull of the tractor. The apparatus is carried by the implement and includes a linear device connected to sense the drawing force exerted upon the implement and a second linear device connected between the implement and its tongue to exert a downward force upon the tongue that is a function of the drawing force sensed by the first device.
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