US Patent 8042817 Adjustable height device for high clearance vehicle

A self-propelled, dirigible agricultural vehicle includes a height-adjustable chassis with an axle and a driven wheel hub. The axle is shiftable between a normal clearance position above the wheel hub and a relatively higher elevated clearance position. The chassis further includes a kingpin and a spacer section that is removably connectable to the kingpin. The axle is in the normal clearance position when the spacer is removed from the kingpin and is in the elevated clearance position when the spacer is connected to the kingpin.