The Wacker Neuson 5200021705 is a genuine OEM Mechanical Seal designed for the APT8T and APT8S series submersible pumps. As a direct OEM replacement, this seal is manufactured to the exact specifications required to maintain a leak-free barrier between the pump's rotating shaft and its housing — preserving both performance and motor integrity. It fits all APT8T configurations including Electric Brake, Surge Brake, and Cold Weather variants, as well as APT8S and APT8S Cold Weather models. When it comes to sealing components in submersible pump applications, fitting the correct OEM part is critical — the 5200021705 ensures you get the right material grade and dimensional tolerancing every time.
Key Features
- Genuine OEM Seal Material: — Manufactured to Wacker Neuson's exact material specification, ensuring the compression and chemical resistance ratings match the demanding wet-environment requirements of APT8 series submersible pumps.
- Drop-In Shaft Alignment: — Engineered to the precise bore and face dimensions of the APT8T and APT8S pump housings, so the seal seats correctly against the rotating shaft without shimming or modification.
- Broad APT8 Series Coverage: — A single part number covers APT8T Electric Brake, APT8T Surge Brake, APT8S Skid-Mount, and all corresponding Cold Weather variants — simplifying parts inventory for mixed fleets.
- Prevents Fluid Ingress to Motor: — A functioning mechanical seal keeps pumped fluid away from the motor cavity. A worn or failed seal allows water infiltration, leading to winding damage and premature motor failure.
- Critical Fluid-System Safety: — In submersible pump applications, a compromised seal can result in uncontrolled leakage around the drive shaft; replacing with a correctly rated OEM seal maintains safe, contained pump operation.
A mechanical seal forms a dynamic, fluid-tight barrier between a pump's rotating drive shaft and its stationary housing. In submersible pump applications like the APT8T and APT8S, this seal prevents pumped media from migrating into the motor cavity along the shaft. It accomplishes this through two precision-lapped faces — one rotating with the shaft, one stationary in the housing — held together under controlled spring load. When the seal faces wear or the seal material degrades, fluid bypasses the barrier, motor windings are exposed to contamination, and catastrophic motor failure follows. Replacing the Wacker Neuson 5200021705 Mechanical Seal at the first sign of shaft leakage is the most cost-effective way to protect the motor and extend overall pump service life.
Part Details
| Part Number | 5200021705 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Mechanical Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT8T Pump, Electric Brake | APT8T | 5200019649, 5200019648 |
| APT8T Pump, Electric Brake, Cold Weather | APT8T CW | 5200019797, 5200019796 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
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.
