The Wacker Neuson Mechanical Seal is a genuine OEM component designed for the APT6S and APT6T series pumps, including standard, Cold Weather, Surge Brake, and Electric Brake configurations. As a factory-sourced part, this seal is manufactured to the exact material and dimensional specifications required to maintain a leak-free interface between the rotating shaft and pump housing. It is a direct-fit replacement for all APT6S and APT6T variants listed in the Wacker Neuson parts catalog, covering both skid-mounted and trailer-mounted pump configurations.
Key Features
- OEM-Grade Seal Material — Manufactured to Wacker Neuson's precise compression and material specifications, ensuring the sealing faces maintain proper contact and resist wear under continuous pumping cycles.
- Shaft-to-Housing Fit — Engineered to the exact shaft diameter and housing bore of APT6S and APT6T pumps, allowing the seal to seat correctly without modification or shimming.
- Broad APT6 Series Coverage — Compatible with APT6S Pump w/Skid, APT6T Pump with Surge Brake, APT6T Pump with Electric Brake, and all corresponding Cold Weather variants.
- Protects Pump Internals — A properly functioning mechanical seal prevents fluid from migrating along the shaft into the bearing cavity, protecting the pump's rotating assembly from contamination and premature wear.
- Fluid Containment Compliance — Maintaining an intact mechanical seal is critical for preventing uncontrolled fluid leaks, which can create safety hazards and environmental concerns on the worksite.
A mechanical seal is the primary barrier between the pumped fluid and the pump's internal bearing and drive components. It works by pressing two precision-machined faces — one rotating with the shaft, one stationary in the housing — against each other to block fluid from escaping along the shaft. When a mechanical seal wears or fails, the pump will begin leaking at the shaft, which can rapidly contaminate the bearing assembly, cause shaft damage, and lead to full pump failure if not addressed. Replacing a worn seal with a correct-specification part like the Wacker Neuson 5200021704 restores the pump's fluid containment and protects the surrounding drivetrain components.
Part Details
| Part Number | 5200021704 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Mechanical Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Surge Brake | APT6T | 5200019646, 5200019647 |
| APT6T Pump, Surge Brake, Cold Weather | APT6T CW | 5200019794, 5200019795 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
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.
