Caterpillar Part reference
Part 0304605 is listed in the Caterpillar catalog as a seal-o-ring. Its catalog record shows two associated occurrences, Caterpillar 725 and Caterpillar 730, within hydraulic system valve groups, but these are catalog associations only and do not establish universal fitment.
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 |
|---|---|
| 0304605 | seal-o-ring (current part) |
| 20***24 | valve group-lowering control; -hoist |
| 23***36 | seal kit; (includes seals and rings) |
| 5L***59 | seal ("o" ring) |
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, an O-ring is a circular elastomeric sealing ring that is seated in a groove to block fluid or gas leakage between mating surfaces. In heavy equipment hydraulic systems, O-rings are used to seal ports and fittings where pressurized fluid must be contained.
Reference Caterpillar part number 0304605 when requesting this item. Before ordering, confirm the machine model, serial number and assembly location against the catalog occurrence conditions, since the associated parent units carry their own serial and configuration qualifiers.
Catalog references
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