Patent ID: 8573336

Claim:
A machine comprising: a frame; an undercarriage; a first torsion axle assembly connecting the frame to the undercarriage, the first torsion axle assembly including a first torsion shaft assembly, a first torsion arm, and a first axle, the first torsion shaft assembly attaches to and extends from the frame, the first torsion arm attaches to the first torsion shaft assembly at one of a plurality of preset selectable rotational attachment orientations, the first axle attaches to and extends from the first torsion arm a distance from the first torsion shaft assembly, and the first axle attaches to the undercarriage; and a second torsion axle assembly connecting the frame to the undercarriage, the second torsion axle assembly including a second torsion shaft assembly, a second torsion arm, and a second axle, the second torsion shaft assembly attaches to and extends from the frame, the second torsion arm attaches to the second torsion shaft assembly at one of the plurality of preset selectable rotational attachment orientations, the second axle attaches to and extends from the second torsion arm a distance from the second torsion shaft assembly, and the second axle attaches to the undercarriage, wherein the undercarriage comprises a roller frame and the first axle is attached to an upper surface of the roller frame and the second axle extends through the roller frame.