The Wacker Neuson 5200021707 is a genuine OEM Lip Seal designed for the APT4S, APT4T, APT6S, and APT6T series self-priming centrifugal pumps. As a direct OEM replacement, this seal is manufactured to the exact material and dimensional specifications required for proper shaft sealing in these pump assemblies. It fits across the full APT pump lineup, including surge brake, electric brake, skid-mounted, and cold weather variants. Keeping this seal in good condition is essential to maintaining pump efficiency and preventing fluid leakage around the rotating shaft.
Key Features
- Genuine OEM Sealing Material — Manufactured to Wacker Neuson's exact compound and durometer specifications, ensuring the correct compression and sealing performance for rotating pump shaft applications.
- Drop-In Shaft Seal Replacement — Seats directly into the existing seal bore without machining or modification, restoring the original shaft-to-housing interface on APT series pump assemblies.
- Broad APT Series Coverage — Compatible with APT4S, APT4T, APT6S, and APT6T pumps across surge brake, electric brake, skid-mounted, and cold weather configurations.
- Prevents Shaft Leakage — A worn or cracked lip seal allows fluid to migrate along the shaft, leading to external leakage, contamination of adjacent components, and progressive pump performance loss.
- Verified OEM Part Number — Sourced directly through Wacker Neuson's parts network; part number 5200021707 confirms correct fitment before ordering.
A lip seal is a dynamic shaft seal that prevents fluid from escaping along the rotating pump shaft where it passes through the housing. The flexible sealing lip maintains constant contact with the shaft surface, blocking liquid from leaking out and keeping contaminants from entering the pump internals. When a lip seal wears, hardens, or cracks, the result is visible shaft leakage, reduced pump efficiency, and the risk of damage to bearings and other internal components — making timely replacement critical to keeping the pump running at full capacity.
Part Details
| Part Number | 5200021707 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lip Seal |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Electric Brake, Cold Weather | APT6T CW | 5200019795, 5200019794 |
| APT6T Pump, Surge Brake | APT6T | 5200019646, 5200019647 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
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.
