Abstract: An operator's station mounted on the rear bogie of an articulated tractor and having a door that swings out from a hinge on its rear edge and in which the front bogie may swing relative to the rear bogie so that parts of the tractor on the front bogie may move into the zone of swinging of the door, the improvement residing in the hinge structure and door positioning structure which automatically shifts the door into either its fully opened or fully closed positions and out of the area in which the aforesaid tractor parts may shift. The structure includes means for hinging the door to swing about a vertical axis from its rear edge and a link structure that is connected to a post on the operator's station and which has a rear end connected thereto on a pivot structure that is offset inwardly and rearwardly from the hinge axis of the door. The link structure further includes a portion that extends from its rear and forwardly alongside a face of the door to a front end which is connected to the door.

Abstract: An engine having top, side shields and opposite ends operatively enclosing an engine. Each side shield has displaceable panel including a first panel hingedly supported from the enclosure top extending downward, and a second panel hingedly supported from the lower edge of the first panel. The lower edge of the second panel abuts the bottom of the enclosure. A restraining means for supporting and generally maintaining the second panel co-planar with the first panel in a first position and generally parallel and opposite to the first panel in a second position.