A track roller for an undercarriage system includes a roller shell with a first inner surface forming a larger diameter shaft bore and a second inner surface forming a smaller diameter shaft bore coaxially arranged with the larger diameter shaft bore. A roller shaft having a first shaft end and a second shaft end supports the roller shell for rotation and has an oil reservoir formed therein. A first sleeve bearing and a second sleeve bearing are positioned upon the roller shaft, and an axially extending oil passage is formed by the second inner surface of the roller shell forming the smaller diameter shaft bore and an outer bearing surface of the second sleeve bearing. The oil reservoir in the roller shaft is confined in its extent to the second shaft end of the roller shaft.

A track roller for an undercarriage system includes a roller shell with a first inner surface forming a larger diameter shaft bore and a second inner surface forming a smaller diameter shaft bore coaxially arranged with the larger diameter shaft bore. A roller shaft having a first shaft end and a second shaft end supports the roller shell for rotation and has an oil reservoir formed therein. A first sleeve bearing and a second sleeve bearing are positioned upon the roller shaft, and an axially extending oil passage is formed by the second inner surface of the roller shell forming the smaller diameter shaft bore and an outer bearing surface of the second sleeve bearing. The oil reservoir in the roller shaft is confined in its extent to the second shaft end of the roller shaft.

A track roller assembly includes a wheel body, a bearing, a wheel axle, a cap element, a rotating oil seal, an end cover and an oil body. The wheel body has a thread. The bearing is disposed on the wheel body. The wheel axle is disposed through the bearing. The cap element has a screw corresponding to the thread. One side of the rotating oil seal is connected to the cap element, and another side of the rotating oil seal rotatably abuts the wheel axle. The end cover is connected to the wheel axle. The oil body is limited to an accommodating space formed by the wheel body, the wheel axle, the cap element and the rotating oil seal.

A track roller assembly includes a wheel body, a bearing, a wheel axle, a cap element, a rotating oil seal, an end cover and an oil body. The wheel body has a thread. The bearing is disposed on the wheel body. The wheel axle is disposed through the bearing. The cap element has a screw corresponding to the thread. One side of the rotating oil seal is connected to the cap element, and another side of the rotating oil seal rotatably abuts the wheel axle. The end cover is connected to the wheel axle. The oil body is limited to an accommodating space formed by the wheel body, the wheel axle, the cap element and the rotating oil seal.

A cartridge pin assembly in a track chain assembly includes a sleeve bearing having a flared end.

A link assembly includes a first member, a second member opposing the first member and being rotatable around a rotating shaft, a seal housing formed between the first and second members, and a seal assembly disposed inside the seal housing. The seal assembly has a seal ring and a load ring. The seal ring has a support ring and a lip ring. The seal ring is disposed between the first member and the load ring. The load ring is disposed between the seal ring and the second member. The lip ring abuts the load ring. The lip ring has a first lip part that abuts the first member and protrudes in an axial direction of the rotating shaft, and a second lip part that abuts the second member and protrudes in a radial direction perpendicular to the rotating shaft.

A link assembly includes a first member, a second member opposing the first member and being rotatable around a rotating shaft, a seal housing formed between the first and second members, and a seal assembly disposed inside the seal housing. The seal assembly has a seal ring and a load ring. The seal ring has a support ring and a lip ring. The seal ring is disposed between the first member and the load ring. The load ring is disposed between the seal ring and the second member. The lip ring abuts the load ring. The lip ring has a first lip part that abuts the first member and protrudes in an axial direction of the rotating shaft, and a second lip part that abuts the second member and protrudes in a radial direction perpendicular to the rotating shaft.

A sealed and lubricated rotatable track engaging element includes a roller and a roller shaft extending through the roller to support the roller for rotation about a major axis. A first thrust surface is fixed relative to the roller, and a second thrust surface is fixed relative to the roller shaft. A seal cavity extends between the roller and the roller shaft and is formed in part by each of the first thrust surface and the second thrust surface, and a thrust washer stack is within the seal cavity and trapped between the first thrust surface and the second thrust surface. The thrust washer stack includes an inner thrust washer contacting the roller to rotate at a first fractional speed of a speed of rotation of the roller, and an outer thrust washer contacting the inner thrust washer and the collar to rotate at a second fractional speed that is less than the first fractional speed.

A track roller assembly may have a track roller, a roller shaft and collars press fit onto either end of the roller shaft to retain the track roller on the roller shaft with an axial clearance between the collars and the track roller. During assembly, the collars may be press fit onto the shaft ends and forced axially inwardly until further axial movement of the collars is prevented by engagement shoulders of the track roller. A compressive axial load may be applied to the roller shaft to reduce a shaft length of the roller shaft and to cause the roller shaft to slide inwardly relative to the collars. The compressive axial load is removed from the roller shaft so that the roller shaft extends back to the normal shaft length and the collars move axially farther apart as the roller shaft extends back to the normal shaft length.

A track roller assembly may have a track roller, a roller shaft and collars press fit onto either end of the roller shaft to retain the track roller on the roller shaft with an axial clearance between the collars and the track roller. During assembly, the collars may be press fit onto the shaft ends and forced axially inwardly until further axial movement of the collars is prevented by engagement shoulders of the track roller. A compressive axial load may be applied to the roller shaft to reduce a shaft length of the roller shaft and to cause the roller shaft to slide inwardly relative to the collars. The compressive axial load is removed from the roller shaft so that the roller shaft extends back to the normal shaft length and the collars move axially farther apart as the roller shaft extends back to the normal shaft length.