Backup Ring 3Y2768 (3Y-2768)

Backup ring for high-pressure sealing assemblies used in Caterpillar equipment, including track-type tractors, wheel tractor-scrapers, motor graders, and track-type loaders. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The ring is installed with an elastomeric seal and mating components to help prevent seal extrusion in static and dynamic high-pressure applications. The listed application areas include hydraulic pumps, valves, and engine systems. The part is made of steel and is identified by SKU 3Y2768.

Fitment

The 3Y2768 backup ring is listed for the following Caterpillar equipment models and series:

• Track-type tractors: 3, 3P, 3S, 3S LGP, 53, 5A PAT, D3, D3B, D3C, D3C II, D3C III, D3G, D4B, D4C, D4C II, D4C III, D4G, D5C, D5C III, D5C PAT, D5C PATLGP, D5G.
• Wheel tractor-scrapers: 627B, 627E, 627F, 627G, 631K, 637D, 637E, 637G, 637K, 657, 657B, 657E, 657G.
• Motor graders: 120H, 12H NA, 140H NA, 16G.
• Track-type loaders: 931.

Fitment should be checked against the equipment model and the required part number before installation, particularly where several machine configurations or series are available.

Cross-reference numbers

• Caterpillar part number: 3Y-2768.
• Product SKU: 3Y2768.

Part number 3Y2768 and the hyphenated designation 3Y-2768 refer to the same backup ring identification listed for the compatible Caterpillar equipment.

Specifications