Abstract: A pin joint assembly for a machine includes a seal assembly having first and second seal rings and first and second gaskets or toric load rings. The first and second seal rings each have a loading surface and a sealing face. The first and second seal rings abut one another such that the sealing faces are in contacting relationship with each other. The first load ring engages a load ring engagement surface of a collar and the loading surface of the first seal ring. The second load ring engages a load ring engagement surface of a bushing and the loading surface of the second seal ring. At least one of the load ring engagement surface of the collar and the loading surface of the first seal ring is adapted to retain the first load ring in proximal relationship to the sealing face of the first seal ring.

Abstract: A seal ring stabilization system disclosed herein includes first and second seal rings, each including a substantially planar surface and a substantially non-planar surface opposite the substantially planar surface. The substantially planar surface of the first seal ring and the substantially planar surface of the second seal ring engage one another. The first seal ring includes a protrusion extending from the substantially planar surface of the first seal ring and away from the substantially non-planar surface of the first seal ring, while the second seal ring defines a recess extending from the substantially planar surface of the first seal ring and toward the substantially non-planar surface of the second seal ring. The recess of the second seal ring receives the protrusion of the first seal ring.

Abstract: A floating pin joint assembly pivotally connects a lift arm between spaced frame members. The lift arm includes a bushing with bearing surfaces supported on the pin for relative movement. Extending end portions of the pin are supported on bearing surfaces defined by collars connected to the frame members by inserts press fit into the frame members. Removable cover plates connected to the inserts contain the axial movement of the pin and permit removal of the pin and other components from the assembly. The load bearing surfaces are disposed within a lubricated chamber extending between the cover plates.