| 摘要 |
A sugar-cane harvester having a frame and a cutter unit is provided with means for adjusting a vertically swingable cutter unit having a skid engaging the ground in its traveling path over uneven ground. This means includes a double-acting hydraulic piston-cylinder unit and a spring whose force counteracts the major part of the weight of the cutter unit. The piston of the hydraulic unit is connected to the cutter unit whereas its cylinder is connected to the frame of the harvester. The adjusting assembly further includes a slide adapted to selectively supply with a working fluid each of two opposite ends of the cylinder chamber, and a pair of electro-magnetic valves actuating the movement of the slide in two opposite directions in response to any inclined position of the cutter unit in its travelling path over uneven ground.
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