Abstract: A dual steering system for vehicles, particularly for large and heavy off-highway vehicles, wherein a back-up steering system is provided for safety purposes. Dual hydraulic systems are provided and coordinated whereby in the event the primary steering system fails for any reason, the back-up steering system automatically assumes the entire steering operation, thus providing a safety feature for the vehicle.
Abstract: A support member for a wheel rim of an off-highway vehicle for facilitating the independent securing of the large wheels and associated disc brakes to the vehicle, and a relief groove on the brake disc for dissipation of heat during a braking operation in order to eliminate or preclude fusing of the disc to stationary elements of the braking apparatus thus facilitating the removal of the disc for replacement or the like.