6J2420 Ring for Caterpillar Equipment

6J2420 is a backup ring used in transmission sealing systems on Caterpillar equipment. The ring supports the sealing element and helps limit seal extrusion when the system is exposed to high hydraulic or transmission pressure.

This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts). The part is identified by the Caterpillar equipment reference 6J-2420 and is also listed under the compact designation 6J2420.

Fitment

The 6J2420 ring is used on the following Caterpillar machine models and series:

• Skidder: 530B.
• Hydraulic mini excavator: 302.5 and 302.5C.
• Wheeled tractor-scraper: 615, 615C, 623B and 623E.
• Loader with telescopic arm: TH350B, TH355B and TH360B.
• Wheel loader: 906H, 906H2, 906K, 906M, 907H, 907H2, 907K, 907M and 980B.
• Articulated dump truck: 730.
• Backhoe loader: 420D, 420E, 428D, 428E, 430D, 430E, 432D, 432E, 438D, 442D, 442E and 450E.
• Cold planer: PM-465 and PM-565B.

Fitment should be checked against the machine model, serial number and the part number marked in the sealing assembly before installation. The listed models cover several Caterpillar equipment categories, including excavators, loaders, tractor-scrapers, dump trucks, backhoe loaders and cold planers.

Cross-reference numbers

The references 6J-2420 and 6J2420 identify the same ring designation. The hyphenated and non-hyphenated formats may be used in parts catalogues and service documentation.

Specifications

The ring is installed as part of the sealing arrangement rather than as a standalone transmission component. Its stated function is to provide support for the seal section and protect the sealing system from extrusion during pressure changes. Installation position and the complete seal arrangement depend on the specific Caterpillar machine and service assembly.