A hydraulic pump has several distinct seal types, each doing a different job — a shaft seal keeps oil from leaking out where the input shaft enters the housing (the single most common leak point on any pump), O-rings seal static joints between housing sections and ports, and wiper/dust seals (on some pump designs) keep external contamination out. When we refurbish a pump, every seal is replaced as standard — but seals also fail independently on pumps that are otherwise healthy, and a seal kit alone is often the right fix.
Seal Types We Supply
| Seal Type | Location | Common Failure Sign |
|---|---|---|
| Shaft Seal | Where input shaft enters pump housing | Oil weeping or dripping at the shaft, worse when hot |
| O-rings | Housing joints, port connections | Leak at a specific joint or fitting, not the shaft |
| Wiper/Dust Seal | External-facing, some cylinder and pump designs | Dirt ingress leading to accelerated internal wear |
| Valve Plate Gasket | Between valve plate and housing (select models) | Internal leak, reduced pressure without external drip |
Seal kit contents vary by pump model. WhatsApp your pump's brand and model number for the exact kit.
Why Seal Kits Are Often the First Fix to Try
A Fraction of Full Pump Cost
A seal kit typically costs a small fraction of a full pump replacement. If your pump's only issue is an external leak with normal pressure and power, a seal kit resolves it without the bigger expense.
Quick Diagnostic Check
An external drip at the shaft with otherwise normal machine performance points to a seal issue, not internal wear. See our troubleshooting guide for the full diagnostic flow.
Fast Turnaround
Seal kits are small, lightweight, and dispatch quickly — often same-day for common models, avoiding the longer wait of a full pump replacement.
Model-Matched Fit
We match seal kits to your exact pump model and revision — seal dimensions vary even within the same broader model family, so getting this right matters.
When a Seal Kit Alone Isn't Enough
If you're seeing power loss, unusual noise, or metal contamination in the oil alongside the leak, the problem likely extends beyond the seals into internal wear — a seal kit will stop the external leak but won't fix reduced performance. In that case, a full refurbishment is the more appropriate fix. See our signs of pump failure guide to help tell the difference.