Patent ID: 8042817

Claim:
In a self-propelled, dirigible agricultural vehicle, a height-adjustable chassis comprising: an axle and a driven wheel hub, with the axle being shiftable between a normal clearance position above the wheel hub and a relatively higher elevated clearance position; a kingpin presenting opposite upper and lower ends, said kingpin being attached relative to the wheel hub adjacent the lower end, said kingpin being attached relative to the axle adjacent the upper end, said kingpin being rotatable relative to the axle about an upright kingpin axis so that the wheel hub swings as the kingpin rotates; a steering mechanism coupled between the axle and wheel hub to effect swinging of the wheel hub; and a spacer section removably connectable to the kingpin between the axle and the wheel hub, with the axle being in the normal clearance position when the spacer is removed and in the elevated clearance position when the spacer is connected between the axle and the wheel hub, and with the steering mechanism being operable to swing the wheel hub when the axle is in either of the positions.