The Wacker Neuson Pump Complete is a genuine OEM Pump Complete designed for the APT4S and APT4T series transfer pumps, including standard, surge brake, electric brake, and cold weather variants. As a factory-sourced component, this assembly is built to the exact specifications Wacker Neuson requires for correct operation across the full APT4 pump lineup. Compatible models include the APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and their respective cold weather counterparts. Ordering by part number ensures you receive the correct complete pump assembly for your specific unit.
Key Features
- OEM-Matched Flow and Pressure Performance — Sourced directly from Wacker Neuson, this Pump Complete is built to the same output specifications as the original unit, maintaining consistent transfer rates and operating pressures.
- Complete Assembly, Ready to Install — Supplied as a fully assembled pump unit, this part installs as a direct swap into the APT4S and APT4T pump frames without modification to mounting points or connections.
- Broad APT4 Series Coverage — Fits six APT4 configurations including standard, surge brake, electric brake, and cold weather variants in both the APT4S and APT4T model families.
- Sustained Transfer Efficiency — A fully functioning pump assembly maintains rated flow capacity and priming ability; a worn or degraded pump leads to reduced output, loss of prime, and incomplete fluid transfer.
- Brake System Compatibility Preserved — Correct fitment across surge brake and electric brake variants ensures the pump assembly integrates properly with trailer braking systems, maintaining safe towing and operational compliance.
The pump assembly is the core working component of a transfer pump unit — it draws fluid in, pressurizes it, and forces it through the discharge line to the desired location. On towable units like the APT4S and APT4T, the pump must maintain consistent prime and flow across variable job conditions. When the pump wears out or fails internally, the unit loses its ability to move fluid efficiently, often showing symptoms such as loss of prime, reduced flow rate, or complete failure to discharge. Replacing the full Pump Complete assembly restores the unit to its original transfer capacity and keeps the machine performing as intended.
Part Details
| Part Number | 5200021718 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Pump Complete |
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.
