| 摘要 |
An adjustable width plow having at least three aligned sections with adjacent ends of the sections joined for relative motion about horizontal axes includes a forward furrow wheel mounted to the forward end of the front plow section for caster movement, a rear furrow wheel mounted to the rear end of the rear plow section for caster movement, a first or forward pair of land wheels supporting the plow adjacent the rear end of the forward section, and a second or rear pair of land wheels supporting the plow adjacent the rear end of the intermediate plow section. A steering mechanism controls the forward land wheels in turns in response to the turning of the tractor pulling the plow, and this steering mechanism also adjusts the forward land wheels for proper steering and toeing as the width of the furrow cut by the plows is adjusted. The rear land wheels are not steered in response to the turning of the tractor, but they are adjusted for proper steering and toeing when the plow units are adjusted. A hydraulic ram is included in the steering mechanism for each set of land wheels to turn them to the right when the ram is extended to facilitate turning the system to the right when the plow units are in the fully-closed road travel position. Actuation of the width adjustment cylinder also adjusts the spacing between the tractor and the furrow wheel on the unit to at least partly compensate for changes in draft.
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