Abstract: A three-point mounting system including a single rear cab mount is provided for mounting the cab to, and isolating the cab from, the frame of a tractor. Two front cab mounts and a single rear cab mount individually connected to the cab at three different points couple the cab to the frame. The location of the three different points are chosen such that a reference line drawn vertically through the center of gravity of the cab will intersect at a point within a triangular area formed by a straight line connection of the three points. The single rear cab mount comprises an improved suspension member for reducing the transmission of shocks and vibrations from the frame to the cab.

Abstract: A frame isolation system is presented which enhances the ride quality of a terminal tractor. The isolation system includes an axle saddle provided with leading and trailing anti-torque links which permit the axle to move through a limited displacement to compensate for rough and uneven road surfaces. The terminal tractor includes a main frame and a rear axle, the axle saddle being rigidly coupled to the rear axle, and a resilient bumper positioned between the main frame and the axle saddle. The rear axle is also permitted to move through limited range of side to side oscillation because of the use of spherical bearings and ball joints between the anti-torque links and their respective connections with the axle saddle and the main frame.