Abstract: A center pintle hub to be affixed to a base of a machine. The center pintle hub includes a base portion and a support portion. The base portion is formed to be affixed to the base. The support portion extends from the base portion and has a frusto-conical shape that can receive a center pintle shaft. The center pintle shaft can support a frame of the machine and provide rotation of the frame with respect to the base.

Abstract: A center pintle hub to be affixed to a base of a machine. The center pintle hub includes a base portion and a support portion. The base portion is formed to be affixed to the base. The support portion extends from the base portion and has a frusto-conical shape that can receive a center pintle shaft. The center pintle shaft can support a frame of the machine and provide rotation of the frame with respect to the base.

Abstract: The disclosure provides a roller assembly for an undercarriage system of a machine. The undercarriage system includes a frame, which has a first inner surface defining a first opening. The roller assembly includes a roller supported on a roller shaft, and a spacer assembly. The spacer assembly includes a boss and a pad. The boss includes a second inner surface defining a second opening. The boss is fixedly attached to the frame, such that the second opening axially aligns with the first opening of the frame. The pad includes a third inner surface defining a third opening. The pad has a relatively greater hardness than the boss. The pad is fixedly attached to the boss, such that the third opening axially aligns with the second opening. Further, the roller shaft extends through the first opening, the second opening, and the third opening, to support the roller on the frame.

Abstract: A center pintle hub coupled to a base of a machine is disclosed. The center pintle hub is casted as a single piece. The center pintle hub includes a disc, a hole, a plurality of protrusions, a hollow cylindrical member, and a plurality of stiffening members. The disc couples to the base and includes a first surface and a second surface. The hole extends from the first surface to the second surface, along a central axis of the disc. The plurality of protrusions, disposed on the second surface, is arranged in an array of square configuration. The plurality of protrusions extends from the second surface and attach to a plurality of stiffeners of the base. The hollow cylindrical member is coupled to the first surface and arranged coaxially with the hole of the disc. The plurality of stiffening members is circumferentially disposed and equally spaced around the hollow cylindrical member.