The Multiquip 0520040431 Impeller Key is a genuine OEM component designed for QP3TH, QP3TZ, QP3TK, QP3THX, QP3TS, and QP3TB series pumps. As a direct-fit OEM replacement, this key ensures the impeller is correctly indexed and locked to the pump shaft, restoring proper rotational engagement and flow performance. Sourced directly from Multiquip, part number 0520040431 meets the same specifications as the original hardware installed at the factory. Confirm your model code against the fitment list before ordering to ensure a correct match.
Key Features
- Genuine OEM Construction — Manufactured to Multiquip's original material and dimensional tolerances, ensuring the key seats correctly in both the shaft keyway and impeller hub without modification.
- Secure Impeller-to-Shaft Engagement — Locks the impeller in its correct rotational position on the drive shaft, preventing slippage that would cause reduced flow and pump cavitation.
- Broad Pump Family Fitment — Compatible with QP3TH, QP3TZ, QP3TK, QP3THX, QP3TS, and QP3TB pump models, covering both trash and centrifugal pump configurations in the QP3 series.
- Restores Full Pumping Capacity — A worn or missing impeller key allows the shaft to spin independently of the impeller, resulting in immediate loss of prime and output; replacing it restores rated performance.
- Simple, Targeted Service Part — Small in size but critical in function — stocking part number 0520040431 as a spare keeps pump servicing fast when an impeller is pulled for inspection or replacement.
The impeller key is a small, precisely dimensioned drive key that fits into a keyway machined into both the pump shaft and the impeller hub. Its role is to lock these two components together so that torque from the engine is transferred directly and fully to the impeller, driving fluid movement through the pump casing. When this key shears, wears, or goes missing, the shaft rotates freely inside the impeller — the pump loses all ability to move water regardless of engine speed. Replacing a damaged or absent key is one of the first steps in diagnosing sudden loss of pump output.
Part Details
| Part Number | 0520040431 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Impeller Key |
Compatibility & Fitment
| Name | Model |
|---|---|
| Trash Pumps | QP3TH |
| Trash Pumps | QP3TZ |
| Trash Pumps | QP3TK |
| Trash Pumps | QP3THX |
| Trash Pumps | QP3TS |
| Trash Pumps | QP3TB |
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.
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