Clark 3738404 - O-ring
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An elastomeric O-ring that seals static and dynamic joints throughout Clark lift truck 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 | 3738404 |
| Component type | Hydraulic O-ring |
| Part type | OEM-grade aftermarket |
| Fits brand | Clark |
| Category | Industrial Forklifts |
Where it is used
Components of this type are fitted to the hydraulic system on Clark lift trucks. This is category-level context, not a fitment list — confirm the part number against your machine's model and serial number 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 Clark part number 3738404 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.