The Wacker Neuson Engine with Keyed Shaft is a genuine OEM replacement designed for the PDT2, PDT3, PDI2, and PDI3 series diaphragm trash pumps. Sourced directly from Wacker Neuson, this engine assembly carries the exact specifications required for proper fitment and operation across both the 50mm/2-inch and 75mm/3-inch pump models in these families. Choosing a genuine OEM component means the integrates seamlessly with your existing pump housing, drive train, and mounting points — no guesswork on shaft dimensions or keyway alignment. If your diaphragm pump is losing power, failing to start, or the engine has sustained damage beyond repair, this assembly gets your unit back to full working capacity.
Key Features
- Genuine OEM Engine Assembly: — Manufactured to Wacker Neuson's original design specifications, ensuring correct output, torque curve, and mechanical interface for diaphragm pump drive applications.
- Keyed Shaft for Positive Drive Engagement: — The pre-machined keyway locks directly to the pump drive coupling, delivering consistent rotational force without slippage under load.
- Broad Diaphragm Pump Compatibility: — Fits PDT2 and PDT3 series as well as PDI2 and PDI3 series, covering both 50mm/2-inch and 75mm/3-inch diaphragm trash pump configurations.
- Restores Full Pump Output: — A worn or failed engine causes loss of prime, reduced flow rate, and pump shutdown; this direct replacement brings discharge performance back to rated capacity.
- Fuel System Integrity: — As a complete engine unit, the 5000161321 includes the engine's fuel and ignition system interfaces, reducing the risk of mismatched components that can cause hard starting or fuel leaks in pump applications.
The engine with keyed shaft is the primary power source for Wacker Neuson's diaphragm-style trash pumps, converting fuel combustion into the rotational energy needed to drive the pump's diaphragm mechanism. The keyed shaft ensures the engine's output is positively locked to the pump drive, preventing slippage that would otherwise cause loss of flow or uneven diaphragm stroke. When the engine degrades — through hours of service, mechanical failure, or damage — the entire pump loses its ability to move water and solids, making a full engine replacement the most dependable path to restoring performance.
Part Details
| Part Number | 5000161321 |
|---|---|
| Old Part Number | 0161321 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Engine with Keyed Shaft |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 50mm/2in Diaphragm Trash Pump | PDT2 | 5000009494 |
| 75mm/3in Diaphragm Trash Pumps | PDT3 | 5000009495, 5000620774 |
| 50mm/2in Diaphragm Trash Pump | PDI2 | 5000009489 |
| 75mm/3in Diaphragm Trash Pump | PDI3 | 5000009491, 5000009492 |
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.
