The Wacker Neuson Injection Pump is a genuine OEM component designed for the APT4S and APT4T series water pump units, including standard, surge brake, electric brake, and cold weather configurations. As a factory-sourced part, the is manufactured to the same specifications as the original, ensuring a direct, hassle-free installation. This injection pump is compatible across the full APT4S and APT4T lineup — whether you're running a skid-mounted APT4S or a cold weather APT4T with electric brakes. When it's time to restore full diesel injection performance, this is the correct OEM replacement for your machine.
Key Features
- Genuine OEM Fuel Delivery Precision — Factory-sourced component calibrated to deliver correct fuel metering and injection timing for consistent diesel engine output.
- Direct-Fit Installation — Engineered to match the original mounting configuration and fuel line connections on APT4S and APT4T series units, so installation goes smoothly without rework.
- Broad APT Series Compatibility — Fits the full APT4S and APT4T lineup, covering surge brake, electric brake, skid-mounted, and cold weather variants.
- Restored Engine Performance — A worn or failing injection pump causes hard starts, rough running, and loss of power; replacing it with this OEM unit brings diesel output back to spec.
- Fuel System Safety Compliance — Using a genuine OEM injection pump ensures correct fuel delivery pressure and timing, helping prevent fuel system faults that can cause unsafe operating conditions.
The injection pump is the heart of a diesel fuel system — it pressurizes and meters fuel, then delivers it to the injectors at precisely the right moment for combustion. On equipment like the APT4S and APT4T pump units, correct injection timing and fuel volume are critical to consistent engine start-up and stable power output under load. When an injection pump wears or fails, symptoms typically include difficult starting, uneven running, black exhaust smoke, or a complete loss of engine power — all of which can halt operations and lead to further engine damage if left unaddressed.
Part Details
| Part Number | 5200020131 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Injection Pump |
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.
