Each of the track links (1) and (4) fit over the track links in front. Link (1) makes a fit over link (11). Link (4) makes a fit over link (12). The connection of the track links make the track assembly.
Each link has a counterbore in the end. The counterbore fits with another link. Seal assembly (9) is installed in the counterbores of the links. Each seal assembly has a load ring and a seal ring. The load ring pushes the seal ring against the end of bushing (2) and the link counterbore. The seal ring gives a positive seal between the bushing and the link counterbore. The edge of the seal ring is against the end of the bushing. Thrust ring (8) is installed on the pin (10). The thrust rings give a specific amount of compression to the seal assemblies. The arrangement of the seal assemblies and thrust rings keeps foreign materials out. The seals also keep oil in the pin joint.
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| Illustration 1 | g00378094 |
Track Assembly (1) Link (2) Bushing (3) Hole (4) Link (5) Retaining ring (6) Rubber stopper (7) Polyurethane plug (8) Thrust ring (9) Seal assembly (10) Pin (11) Link (12) Link | |
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| Illustration 2 | g00378173 |
Master Link and Master Shoe (13) Master shoe (14) Bolts (15) Master link | |
Pin (10) has a hole (3). The hole is almost the full length of the pin. A hole is drilled radially in the pin near the center of the pin. The radial hole allows oil to go to the surface between pin (10) and bushing (2). The hole also allows oil to go to the lip of the seal rings. The oil lubricates the pin and the oil lubricates the bushing. The oil also makes the lip of the seal ring wet. You must keep the lip of the seal ring wet in order to prevent wear. Oil is kept in the pin by a stopper (6). When the chambers in the pin are filled, plug (7) is installed in stopper (6) .
Retaining ring (5) at each end of pin (10) gives the pin positive retention. This positive pin retention eliminates internal end play. Rings (5) are not removed unless the pins are removed. The removal of the pins shears the rings and new parts must be installed at reassembly.
The two-piece master links (15) and master shoe (13) are held together with bolts (14) .
Each pin and bushing assembly is sealed. Each track joint has lubrication. The result is no internal wear on the pin joint. The interval for the turning of the track pins and bushings is much longer because the only wear will be on the outside of the bushings and the links.