Cascade C643373 - O-ring
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An elastomeric O-ring that seals static and dynamic joints throughout Cascade attachment hydraulic circuits — cylinder end caps, valve bodies, manifolds and fitting faces.
Key details
- Seals hydraulic joints against pressure loss and external leakage
- Sized to the cross-section and inside diameter required for this position, not a generic substitute
- Consumable item — replace on every teardown and never reuse a removed O-ring
- Usually ordered alongside back-up rings, wiper seals and U-cup seals from the same repair position
Specifications
| Part number | C643373 |
| Component type | Hydraulic O-ring |
| Part type | OEM-grade aftermarket |
| Fits brand | Cascade |
| Category | Forklift Attachments |
Where it is used
Components of this type are used across Cascade attachment lines including Carton Clamps, Bale Clamps, Fork Positioners, Rotators, Push/Pull attachments, Drum Clamps and Hydraulic ReachForks. This is category-level context, not a fitment list — confirm the part number against your own attachment before ordering.
Service notes
Inspect the sealing groove for scoring, burrs and debris before fitting, and lubricate the new ring with clean hydraulic fluid on assembly. A nicked groove will leak regardless of seal condition.
Fitment & availability
This is an OEM-grade aftermarket replacement manufactured to OE specification. It is cross-referenced to Cascade part number C643373 for identification and is not supplied by the original equipment manufacturer.
Check the part number against your model and serial number before ordering. If this item is not showing as available, use Check Availability and our team will confirm lead time and fitment.