Caterpillar Part reference
The Caterpillar ring-back-up, catalog number 0306127, is listed in the catalog under the hydraulic system group and cylinder group. It is also recorded as a catalog occurrence within a parent cylinder assembly for the Caterpillar AP-200B, so confirm the recorded conditions before ordering.
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 |
|---|---|
| 0306127 | ring-back-up (current part) |
| 07***86 | lockwire |
| 1G***93 | kit-seal |
| 1H***28 | seal (3.73 in. inside diameter) |
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 beside a sealing element in a hydraulic or fluid system to help the seal hold its shape under pressure and reduce extrusion into the clearance gap. Exact construction, material and fit depend on the specific part, so check the catalog entry for those details.
Use part number 0306127 when referencing this ring-back-up. Catalog listings do not establish compatibility for every machine configuration, so review the recorded occurrence conditions and confirm the part against your equipment before ordering.
