The Wacker Neuson Seal is a genuine OEM seal designed for the APT4S and APT4T pump series, including standard and cold weather configurations with both surge brake and electric brake variants. As a factory-sourced component, this seal is manufactured to the exact material and dimensional specifications required by the original equipment, ensuring a correct, leak-free installation every time. Compatible models include the APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and their respective cold weather counterparts. When you need a direct replacement that matches the original, part number is the correct choice.
Key Features
- OEM Material Grade — Manufactured to Wacker Neuson's original compound and compression specifications, delivering the sealing performance the pump was engineered around.
- Drop-In Replacement — Matches the original seal profile exactly, seating into the same housing geometry without rework or adaptation.
- Broad APT Series Coverage — Fits the APT4S and APT4T pump families across surge brake, electric brake, and cold weather variants, covering six distinct pump configurations under a single part number.
- Leak Prevention — A properly seated seal keeps fluid contained within the pump system; a worn or damaged seal allows fluid escape that leads to pressure loss and accelerated component wear.
- Fluid System Integrity — Maintaining a sound seal is essential to safe brake system operation on trailer-mounted pump units — particularly critical on surge brake and electric brake configurations where hydraulic integrity directly affects braking performance.
A seal in a pump assembly serves as the barrier that keeps hydraulic fluid, water, or lubricant contained within its designated chamber while preventing contaminants from entering the system. When a seal is functioning correctly, the pump maintains consistent pressure and flow, and internal components stay protected from dirt, moisture, and corrosive agents. As a seal wears, hardens, or cracks with age and heat cycling, it loses its ability to hold that barrier — resulting in leaks, pressure drop, and potential damage to surrounding components that can escalate into a more costly repair.
Part Details
| Part Number | 5200019877 |
|---|---|
| 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.
