Caterpillar Part reference
Catalog part 0303239 is listed as a ring-back-up in the Caterpillar catalog. The listing does not include further part-specific specifications, so details such as dimensions or materials should be confirmed against the catalog before ordering. Catalog occurrences for this number appear within hydraulic cylinder assemblies for screed-related equipment, which is a catalog association only.
Recorded applications
Selected catalog references that list this part. A catalog association does not confirm fitment for every machine or configuration.
Catalog context
LockedCheck the signed-in Part Book for available diagrams and the complete catalog breakdown.
| Part number | Description |
|---|---|
| 0303239 | ring-back-up (current part) |
| 16***95 | seal-u-cup |
| 2K***37 | nut (national fine); (3/4-16-thd) |
| 5E***87 | seal-wiper |
Selected entries from this catalog unit. Other part numbers are masked. Confirm the full breakdown and your machine configuration before ordering.
View model pageGeneral guidance
In general, a back-up ring is a support ring used alongside a primary seal in a hydraulic or fluid system to help the seal resist extrusion into the clearance gap under pressure. Its exact construction and sizing depend on the specific catalog part, so confirm those details against the listing.
Use part number 0303239 as the reference when ordering. Because this number appears within catalog assemblies, confirm the recorded conditions and the correct application for your machine before purchasing.
Catalog references
Locked