Sealed and Lubricated Track
 | |
| Illustration 1 | g00460732 |
Track Assembly (1) Track link (2) Bushing (3) Radial hole (4) Oil reservoir (5) Track link (6) Pin (7) Track link (8) Track link (9) Thrust ring (10) Plug (polyurethane) (11) Stopper (rubber) (12) Seal assembly | |
The track that is standard on this machine is sealed and lubricated. Each track assembly has links, pins, bushings, thrust rings, polyurethane seal assemblies, rubber stoppers and polyurethane plugs.
Each of track links (1) and (5) fits over the preceding track link. Link (1) fits over link (8). Link (5) fits over link (7). The connection of the track links make the track assembly.
Each track link is designed with a counterbore in the end in order to fit over the preceding track link. Seals (12) are installed in the counterbores. Each seal includes a load ring and a seal ring. The load ring pushes the seal ring against the end of bushing (2) and against the link counterbore. The seal ring makes a positive seal between the bushing and the link counterbore.
Thrust rings (9) are installed on pin (6). The thrust rings compress the seals to a specific tolerance. The thrust rings also control the end play (free movement) of the track joint. The seals and the thrust rings keep foreign materials out of the track joint. The seals and the thrust rings keep lubricating oil in the track joint.
Pin (6) is designed with oil reservoir (4), which runs most of the length of the axis of the pin. Radial hole (3) is drilled in the middle of the length of the pin. Radial hole (3) directs oil to the surface between pin (6) and bushing (2) and to the lips of the seal rings.
The pin, the bushing, and the lips of the seal rings are lubricated in order to prevent wear.
The oil is kept in the pin by stopper (11) and by plug (10). The pin is filled with oil through a hole in the center of stopper (11). When the chamber in the pin is filled, plug (10) is installed in stopper (11) .
Positive Pin Retention
 | |
| Illustration 2 | g00551795 |
Track Assembly (1) Track link (2) Track link (3) Oil reservoir (4) Radial hole (5) Track link (6) Pin (7) Bushing (8) Track link (9) Plug (polyurethane) (10) Stopper (rubber) (11) Retaining ring (12) Seal assembly (13) Thrust ring | |
The track that is optional on this machine has positive pin retention. Each track assembly has links, pins, bushings, thrust rings, polyurethane seal assemblies, rubber stoppers and polyurethane plugs.
Each of track links (1) and (2) fits over the preceding track link. Link (1) fits over link (8). Link (2) fits over link (5). The connection of the track links make the track assembly.
Each track link is designed with a counterbore in the end in order to fit over the preceding track link. Seals (12) are installed in the counterbores. Each seal includes a load ring and a seal ring. The load ring pushes the seal ring against the end of bushing (7) and against the link counterbore. The seal ring makes a positive seal between the bushing and the link counterbore.
Thrust rings (13) are installed on pin (6). The thrust rings compress the seals to a specific tolerance. The thrust rings also control the end play (free movement) of the track joint. The seals and the thrust rings keep foreign materials out of the track joint. The seals and the thrust rings keep lubricating oil in the track joint.
Pin (6) is designed with oil reservoir (3), which runs most of the length of the axis of the pin. Radial hole (4) is drilled in the middle of the length of the pin. Radial hole (4) directs oil to the surface between pin (6) and bushing (7) and to the lips of the seal rings.
The pin, the bushing, and the lips of the seal rings are lubricated in order to prevent wear.
The oil is kept in the pin by stopper (10) and by plug (9). The pin is filled with oil through a hole in the center of stopper (10). When the chamber in the pin is filled, plug (9) is installed in stopper (10) .
Retaining ring (11) at each end of pin (6) gives the pin positive retention. This positive pin retention eliminates internal end play. Rings (11) are not removed unless the pins are removed. The removal of the pins shears the rings. New rings must be installed at reassembly.
Master Link
 | |
| Illustration 3 | g00460735 |
Master Link and Master Shoe (13) Master Shoe (14) Bolts (15) Master Link | |
Two-piece master links (15) and master shoe (13) are bolted together with bolts (14) .
Each assembled track link is sealed. Independent lubrication is provided for components. The seals and the lubrication oil help to prevent internal wear on the track joints. Significant wear occurs only on the outside of the bushings and on the outside of the track links. As a result, the track pins and the bushings are replaced less frequently.