The Multiquip 502010590 Key 5X5X22/4DK is a genuine OEM drive key designed for MDR-9DYE, MDR-9GH, and MDR-9D power trowels. As a direct Multiquip OEM component, 502010590 is manufactured to the same specifications as the original part, ensuring a correct fit within the drivetrain assembly. This key is a critical fastening element that locks rotating components to shafts, and sourcing the exact OEM part helps maintain proper torque transfer and shaft alignment on these machines. DHS Equipment stocks this part to help keep your trowel running without delay.
Key Features
- Genuine OEM Dimensional Accuracy — Manufactured to the precise 5x5x22mm profile specified for this drivetrain application, ensuring correct seating in the keyway without play or binding.
- Direct Shaft-to-Hub Engagement — Drops into the existing keyway slot on compatible MDR-9 series trowel shafts, restoring positive torque transfer between shaft and hub immediately upon installation.
- Confirmed Fitment for MDR-9 Series Trowels — Verified for use with MDR-9DYE, MDR-9GH, and MDR-9D power trowels, covering the diesel and gas variants in the MDR-9 family.
- Prevents Slippage Under Load — A correctly sized and properly seated drive key keeps rotating components locked to the shaft during high-torque troweling passes, preventing component slippage that can cause uneven blade rotation or premature wear.
- OEM Traceability — Supplied as a genuine Multiquip part under part number 502010590, giving you a clear service record and a known-good reference for future maintenance intervals.
A drive key is a small but essential component in a power trowel's drivetrain. It sits in a machined slot — the keyway — cut into both the shaft and the hub of a rotating component such as a blade spider or drive gear, locking the two together so they turn as a single unit. Without a properly functioning key, the shaft can spin independently of the component it drives, resulting in loss of blade control, inconsistent finishing performance, and accelerated damage to both the shaft and the hub. Replacing a worn, sheared, or missing key with the correct OEM part restores full mechanical engagement and protects the surrounding drivetrain components from secondary damage.
Part Details
| Part Number | 502010590 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Key 5X5X22/4DK |
Compatibility & Fitment
| Name | Model |
|---|---|
| Power Trowels | MDR-9DYE |
| Power Trowels | MDR-9GH |
| Power Trowels | MDR-9D |
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.
