The Wacker Neuson 5200020430 Yanmar Engine is a genuine OEM power unit designed for the APT4T and APT4S series self-priming trash pumps, including Electric Brake, Surge Brake, and Cold Weather configurations. As a direct Wacker Neuson OEM component, the 5200020430 is sourced and validated to the exact specification of the original engine used on these machines — no guesswork on compatibility. This engine is confirmed to fit the APT4T Pump Electric Brake, APT4T Pump Surge Brake, APT4S Pump with Skid, and their respective Cold Weather variants, covering the full APT4 pump family.
Key Features
- Genuine OEM Yanmar Power — Sourced directly from Wacker Neuson as an OEM-validated Yanmar engine, ensuring the correct displacement, output rating, and mounting configuration for the APT4 pump series.
- Drop-In Engine Replacement — Mounts directly to the APT4T and APT4S pump frames using the original bolt pattern and interface, with no custom adapters or fabrication needed.
- Broad APT4 Family Coverage — Fits APT4T Electric Brake, APT4T Surge Brake, APT4S with Skid, and all corresponding Cold Weather variants, making this a single-part solution across the APT4 lineup.
- Restored Pump Output and Prime — A healthy engine is what drives priming speed and sustained discharge flow on a trash pump; replacing a worn or failed engine restores the full pumping capacity the machine was built to deliver.
- Fuel System Integrity — As the primary power source in a fuel-burning pump, using the correct OEM engine ensures the fuel delivery and ignition systems operate within designed parameters, reducing the risk of unsafe running conditions in the field.
The engine on an APT4 series trash pump is the heart of the entire unit — it drives the impeller that creates the vacuum needed to self-prime and move water, slurry, or debris-laden fluid. When the engine loses compression, fails to start, or runs inconsistently, the pump cannot build or hold prime, and discharge flow drops off or stops entirely. Replacing the engine with the correct OEM Yanmar unit restores full prime recovery speed and rated flow, getting the pump back to work at the output level it was designed to maintain.
Part Details
| Part Number | 5200020430 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Yanmar Engine |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
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.
