Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

AN outboard wheel was used to support a harvesting machine attached by means of the three-point hitch to the right side of a small (approximately 20 kW) tractor. The wheel was hydraulically powered to alleviate side draft caused by the rolling resistance of the wheel, and the draft from a trailer which was hitched, offset to the tractor directly behind the harvester to receive the harvested material. The wheel support frame was pivoted on a vertical axis which allowed the frame to move back and forth between stop blocks. This motion was used to modulate a value which controlled the flow of hydraulic oil to the wheel drive motor. If the wheel moved too far ahead, it would partially close the valve and bring the wheel back to its proper position. The control system worked properly in controlling wheel speed and eliminated side draft up and down slopes, on level ground and in left- and right-hand turns.