3T8403 Gasket for Caterpillar Equipment

3T8403 is a flat beaded gasket used on equipment manufactured by Caterpillar, including tracked bulldozers and skidding Caterpillar tractors. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is listed in the Beaded Gaskets category. The supplied gasket has a medium-compression sheet-gasket material construction and a nominal thickness of 0.03 inches. The listed hole pattern includes sixteen holes with a 0.41-inch diameter and two holes with a 0.79-inch diameter.

Fitment

The gasket is identified for the following Caterpillar equipment models and series:

• Tracked bulldozers: 4, 4A, 4P, 4S, 5, 54, 55, 5A, 5P, 5S, D4H, D4H III, D4H XL, D5H, D5H XL.
• Skidding Caterpillar tractors: 4P, 517, 527, 54H, D4HTSK II, D4HTSK III, D5HTSK II.

Fitment should be checked against the machine model and the required gasket number before installation, particularly where the same model designation is available in more than one configuration. The listed application data covers the model names and series specified for part number 3T8403.

Cross-reference numbers

• 3T-8403 — Caterpillar part-number format for the same gasket reference.
• 3T8403 — SKU and non-hyphenated part-number format.

Part-number formats may appear with or without the hyphen depending on the parts catalog, equipment documentation, or supplier listing.

Specifications

The dimensions and hole sizes listed above describe the supplied gasket data. The hole pattern consists of the specified sixteen smaller openings and two larger openings; the product data does not provide additional information about the outline profile, bolt-circle dimensions, or installation position.