The Wacker Neuson Throttle Return Spring is a genuine OEM throttle return spring designed for the MDP3, MDP3X, and PT3c series diaphragm trash pumps. As a direct OEM part, it is manufactured to the same specification as the original component, ensuring correct tension, geometry, and material grade for a drop-in replacement. This spring is confirmed to fit the MDP3, MDP3X 75mm/3in diaphragm trash pumps, and the PT3c series, making it a reliable sourcing choice for service technicians and equipment operators working with these machines. Keep part number on hand as a standard service item to maintain throttle response and pump reliability in the field.
Key Features
- Correct Spring Rate for Throttle Control — Manufactured to OEM tension specification, ensuring the throttle lever snaps back consistently and does not stick or lag under load.
- Genuine Wacker Neuson OEM Part — Sourced directly from Wacker Neuson, this is the same spring installed on the production line — not an approximation.
- Direct Installation Fit — Engineered to seat in the original mounting points on the MDP3, MDP3X, and PT3c pump throttle assemblies with no modification needed.
- Covers Key Diaphragm Pump Models — Fits MDP3, MDP3X 75mm/3in diaphragm trash pumps, and PT3c series — one part number across multiple platforms in this family.
- Restores Throttle Snap and Idle Return — A worn or fatigued throttle return spring causes sluggish throttle response or failure to return to idle, putting the engine at risk of over-revving; replacing it restores safe, predictable operation.
The throttle return spring is a small but critical component in the engine throttle assembly of a diaphragm trash pump. Its job is to pull the throttle lever or linkage back to the idle or closed position when operator input is released, ensuring the engine does not remain at high RPM unintentionally. When this spring weakens, stretches, or breaks, the throttle may stick open or respond slowly, which can lead to uncontrolled engine speed, difficulty shutting down the pump, and accelerated wear on engine components. Replacing a fatigued spring promptly keeps throttle behavior predictable and the pump operating safely.
Part Details
| Part Number | 5000409393 |
|---|---|
| Old Part Number | 0409393 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Throttle Return Spring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| MDP3 | MDP3-CE | 5100056324 |
| 75mm/3in Diaphragm Trash Pumps | MDP3X | 5000630420 |
| PT3c | PT3G-c CE | 5100079343 |
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.
