The Wacker Neuson 5100028521 is a genuine OEM Gasket & O-Ring Set designed for the PS4-7503 and PS4-11003 series submersible pumps. As a factory-sourced assembly, this set delivers the exact sealing materials, compound grades, and dimensional tolerances specified for these pumps — ensuring a proper seal across all fluid passages and mating surfaces. The 5100028521 covers multiple variants within the PS4 family, including HF and HH motor configurations across 220V, 440V, and 400V voltage ratings. If your PS4 series submersible pump is leaking, losing prime, or showing signs of seal wear, this is the correct service set to restore it.
Key Features
- Sealing Material Accuracy — Genuine OEM compound grades ensure correct compression and chemical resistance against the fluids these submersible pumps handle.
- Complete Set for Service — Includes all gaskets and O-rings needed for a full seal service, so you are not chasing individual pieces across multiple orders.
- Broad PS4 Family Coverage — Fits PS4-7503HF, PS4-7503HH, PS4-11003HF, and PS4-11003HH variants, spanning 10 hp and 15 hp motor ratings in multiple voltage configurations.
- Factory Fitment, No Guesswork — Each seal profile matches the exact bore sizes and groove dimensions of the PS4 pump housing, so components seat correctly on reassembly.
- Protects Motor and Pump Internals — Worn or failed seals allow water ingress into motor windings and pump chambers, leading to catastrophic motor failure; replacing them on schedule prevents costly pump loss.
- Leak-Free Operation Restored — A correctly sealed PS4 pump maintains rated discharge pressure and flow, protecting both pumping efficiency and the surrounding work environment.
The gaskets and O-rings in a submersible pump form the primary barrier between pressurized fluid passages, the motor housing, and the external environment. In the PS4 series, these seals prevent water from migrating into the motor windings and stop internal fluid from bypassing impeller chambers, which would reduce flow and discharge pressure. When seals degrade — through age, heat cycling, or abrasive material contact — the pump may begin leaking externally, lose efficiency, or allow moisture into the motor, ultimately causing winding failure. Replacing the full Gasket & O-Ring Set at the first sign of leakage or during scheduled maintenance restores the pump to its original sealed condition and extends overall service life.
Part Details
| Part Number | 5100028521 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Gasket & O-Ring Set |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| PS4 7503HH Sub. Pump, 440V/60hz, 10hp, 12.8A | PS47503HH | 5000009148, 5000009147, 5000008856, 5000008857 |
| PS4-11003HF | PS411003HF | 5000008878, 5000008872, 5000009210 |
| PS4-11003HH | PS411003HH | 5000008876, 5000009154, 5000008868, 5000009153, 5000009208 |
| PS4-7503HF | PS47503HF | 5000008862, 5000008863, 5000009206 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
