The Wacker Neuson Seal is a genuine OEM component designed for the APT4S and APT4T series pumps, including standard, electric brake, surge brake, and cold weather configurations. As a direct OEM part, it is manufactured to the same specifications as the original, ensuring a drop-in fit without guesswork. This seal covers the full APT4S and APT4T pump lineup, making it the correct choice whether you are servicing a skid-mounted unit or a cold weather variant. Keep part number on hand for routine maintenance or unplanned repairs on these pump models.
Key Features
- OEM-Grade Sealing Material — Manufactured to the same compression and material standards as the original, ensuring consistent sealing performance under pump operating pressures.
- Drop-In Replacement — Engineered to seat and align exactly as the factory-installed seal, with no trimming, shimming, or modification needed during installation.
- Broad APT Series Compatibility — Fits APT4S and APT4T pump models across standard, electric brake, surge brake, and cold weather configurations.
- Leak Prevention — A properly functioning seal keeps fluid contained within the pump housing, maintaining prime and protecting internal components from contamination and premature wear.
- Fluid Containment Safety — Maintaining an intact seal prevents uncontrolled fluid leaks that can create slip hazards and environmental compliance issues on the worksite.
A seal in a pump system creates a pressure-tight barrier between moving or mating components, preventing fluid from escaping the pump housing during operation. When a seal degrades or fails, the pump may lose prime, produce irregular output pressure, or allow fluid to leak externally — reducing efficiency and potentially damaging surrounding components. Replacing a worn seal promptly restores proper containment and keeps the pump operating at its intended capacity.
Part Details
| Part Number | 5100040904 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
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.
