3J0377 Oil Seal for Caterpillar Equipment

The 3J0377 oil seal is a lip-type seal used in Caterpillar equipment. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The seal is listed for several Caterpillar equipment categories, including track-type tractors, wheel bulldozers, wheel-type loaders, wheeled tractor-scrapers, ship equipment, ground compactors for earthwork, and load-haul-dump machines. The applicable machine models are specified below.

Fitment

Fitment is identified by the Caterpillar equipment category and model designation. Before installation, the seal dimensions and part number should be checked against the component being replaced, particularly where the same machine model may have different configurations.

Cross-reference numbers

3J0377 and 3J-0377 are the two part-number formats specified for this oil seal.

Specifications

The main sealing material is NBR, also known as nitrile rubber. The specified shaft diameter identifies the nominal shaft size for the sealing lip, while the outside diameter identifies the external fitting dimension. The seal width is 0.625 inch.

The supplied product data lists overall dimensions of 20.32 cm in length, 20.32 cm in width, and 2.54 cm in depth, with a listed weight of 0.9 lb. These values are provided as product dimensions and weight; the seal’s functional dimensions are the outside diameter, shaft diameter, and width shown above.