The Multiquip 750 Key 1/4" X 3/8" X 1" is a genuine OEM component designed for the ST-45HRM concrete pump. As an authorized Multiquip replacement part, the part meets the exact dimensional tolerances required to maintain proper shaft-to-hub engagement on your equipment. This key is a direct drop-in replacement for the ST-45HRM, ensuring the drive assembly performs as intended without modification. DHS Equipment stocks this part to get your concrete pump back in service quickly.
Key Features
- Exact OEM Dimensions: — Manufactured to precise 1/4" x 3/8" x 1" tolerances to maintain correct shaft-to-hub torque transfer without slippage or play.
- Genuine Multiquip Part: — Sourced directly from Multiquip, this OEM key matches the original specification for the ST-45HRM concrete pump drive system.
- Direct-Fit Replacement: — Seats cleanly into the existing keyway on the ST-45HRM, requiring no machining or fitting adjustment during installation.
- Protects Drive Components: — A correctly sized key prevents shaft and hub wear caused by fretting or micro-movement, extending the service life of surrounding drivetrain parts.
- Critical Safety Function: — A worn or sheared key can cause sudden loss of drive engagement on a working concrete pump — replacing it promptly maintains safe, controlled operation.
A woodruff or parallel key like the Multiquip 750 serves as the mechanical link between a rotating shaft and an attached component such as a sprocket, pulley, or impeller hub. It transmits torque by sitting in machined slots cut into both the shaft and the mating hub, preventing them from spinning independently. When a key wears, shears, or goes missing, the driven component loses positive engagement with the shaft, resulting in power loss, erratic operation, or component damage that can extend well beyond the key itself.
For fitment questions or to confirm this part is correct for your ST-45HRM, contact the DHS Equipment parts team for assistance.
Part Details
| Part Number | EM750 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Key 1/4" X 3/8" X 1" |
Compatibility & Fitment
| Name | Model |
|---|---|
| Submersible Pumps | ST-45HRM |
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.
