2S2978 Ring for Caterpillar Equipment

The 2S2978 is a transmission seal ring used on Caterpillar equipment, including track-type tractors, Challenger machines, off-road dump trucks, wheel-type loaders, wheeled tractor-scrapers, and pipe-layers. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is identified by the Caterpillar-compatible number 2S-2978 and is listed for the machine models and series below.

Fitment

• Track-type tractors: 10, 10C, 10S, 10U, D10, D8K, D9H.
• Challenger machines: MT700, MTC745, MTC755, MTC735, MTC765.
• Off-road dump trucks: 776, 777.
• Wheel-type loaders: 992, 992B.
• Wheeled tractor-scrapers: 641B, 651B, 657, 657B.
• Pipe-layers: 594H.

The listed applications cover several Caterpillar equipment types. The exact installation position is within the transmission sealing arrangement and may depend on the machine configuration and serial-number range.

Cross-reference numbers

• 2S2978
• 2S-2978
• CA2S2978

These numbers are used to identify the same ring in equipment-parts and supplier catalogues. Verify the required number against the part installed on the machine before replacement, particularly where different configurations are available for the same model series.

Specifications

The dimensions above are the values provided for this product listing. The source data contains differing weight values of 0.07 lb and 0.1 lb, so no single weight is specified here. Dimensional and application checks should be made against the removed ring and the machine parts documentation when the equipment has multiple transmission configurations.