The Multiquip 50018100 Key 8x11 QP-40TDH is a genuine OEM component designed for the QP-40TDH trash pump. This small but critical drive key is sourced directly from Multiquip, ensuring it meets the exact dimensional tolerances required for proper shaft and impeller engagement. As a genuine OEM part, 50018100 is the manufacturer-approved replacement, built to the same specification as the original component installed at the factory. Confirmed fitment for the QP-40TDH keeps your pump back in service with confidence.
Key Features
- Genuine OEM Dimensional Accuracy — Machined to the exact 8x11 key specification, ensuring a flush, play-free fit in the keyway with no slop or misalignment.
- Direct Drop-In Replacement — Seats into the shaft keyway of the QP-40TDH the same way the original did, with no filing, grinding, or shimming required.
- Confirmed QP-40TDH Fitment — Verified for the Multiquip QP-40TDH trash pump; use part number 50018100 to confirm compatibility before ordering.
- Positive Drive Transfer — A correctly sized and seated key locks the impeller to the shaft, ensuring full torque transmission and preventing slippage under pump load.
- Prevents Shaft and Impeller Damage — A worn or missing key allows rotational slippage that quickly scores both the shaft and hub bore, turning a minor repair into a major one.
A drive key is a small rectangular metal component that sits in a machined slot — called a keyway — between a rotating shaft and a mounted component such as an impeller or pulley. Its job is to lock the two parts together rotationally so that torque from the engine transfers fully to the pump impeller without slipping. When a key shears, wears down, or goes missing, the shaft spins independently of the impeller, resulting in a pump that runs but moves no water. Replacing it promptly with the correct-specification key, such as this 8x11 unit, protects the keyway surfaces on both the shaft and the hub from the damage that slippage causes.
Part Details
| Part Number | 50018100 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Key 8x11 QP-40TDH |
Compatibility & Fitment
| Name | Model |
|---|---|
| QP-40TDH | QP-40TDH |
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.
