Patent ID: 8225903

Claim:
A swather tractor comprising: a tractor frame; ground wheels for supporting the tractor frame including two driven wheels at a first driven end of the tractor for driving forward motion of the tractor over the ground and two non-driven castor wheels mounted at a second end of the tractor; wherein the driven wheels each include a hydraulic drive motor for driving the wheel; an engine mounted on the tractor frame; mounting assemblies at the driven end for supporting a crop cutting header at a position in front of the driven end and in front of the cab when the driven end is forwards; a cab mounted on the tractor frame; the cab including a seat for an operator and control devices for manual operation by the operator including a speed control device and a steering control device; the speed control device including a speed control linkage having a mechanical speed link arm mounted on the cab and movable to effect a speed control; the steering control device including a steering control linkage having a mechanical steering link arm mounted on the cab and movable to effect a steering control; the cab having a base for attachment to the tractor frame and a cab structure upstanding from the base containing the seat and control devices; and a suspension for supporting the cab on the tractor frame, the suspension comprising: four spring elements arranged substantially at four corners of the base each arranged to support the base from the frame and each allowing up and down spring movement of the base relative to the frame; a first link arrangement comprising at least one first link pivotally connected at a first end to the base and pivotally connected at a second opposed end to the frame, the first link being substantially horizontal and arranged such that the first link prevents movement of the base relative to the frame in a direction longitudinal of the first link; a second link arrangement comprising at least one second link extending in a direction at right angles to the first links and pivotally connected at a first end to the base and pivotally connected at a second opposed end to the frame, the second link being substantially horizontal and arranged such that the second link prevents movement of the base relative to the frame in a direction longitudinal of the second link; said first link being generally parallel to the steering link arm and arranged to remain generally parallel thereto when the cab moves on the suspension, said second link being generally parallel to the speed link arm and arranged to remain generally parallel thereto when the cab moves on the suspension.