Caterpillar Part reference
Catalog reference 0306125 is listed as ring-backup. Catalog occurrences associate it with hydraulic cylinder assemblies used in Caterpillar CR20 crusher hydraulic systems, but those associations are catalog records only and do not establish universal fitment. Confirm the recorded conditions for the specific cylinder 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 |
|---|---|
| 0306125 | ring-backup (current part) |
| 09***33 | seal-o-ring; (id=209.30mm) |
| 12***17 | bolt-socket head; (m24x3x70-mm) |
| 14***97 | bearing |
Selected entries from this catalog unit. Other part numbers are masked. Confirm the full breakdown and your machine configuration before ordering.
Browse Caterpillar modelsGeneral guidance
In general, a backup ring is a support ring used alongside a seal in hydraulic and mechanical assemblies. Its role is typically to help the seal resist extrusion under pressure, though the exact function of this part should be checked against the catalog.
Please order using the existing target part number 0306125. Before ordering, check the recorded catalog conditions for the parent cylinder assembly, including its serial number range and specifications, and confirm they match your machine.
Catalog references
Locked