The Multiquip 21899 is a genuine OEM STX/HTX Hydraulic Motor Key Sauer 682L9159 designed for HTX44K5, HTX44Y4, HTX44Y5, and HTX44K4 hydrostatic ride-on power trowels. As a direct Multiquip OEM part, 21899 is manufactured to the exact tolerances required by the Sauer hydraulic motor assembly, ensuring a secure, properly keyed connection with no guesswork on fit. DHS Equipment supplies this part straight from the Multiquip OEM catalog, so you can order with confidence knowing you're receiving the correct component for your machine. Confirm your model code before ordering to ensure compatibility with your specific HTX44 series trowel configuration.
Key Features
- OEM-Grade Dimensional Accuracy — Machined to the precise key profile required by the Sauer 682L9159 hydraulic motor, ensuring full engagement between the shaft and motor without slop or misalignment.
- Direct Interchange with Sauer 682L9159 Motor — Replaces the original key on the Sauer hydraulic motor assembly; drops into the existing keyway without modification to the shaft or motor housing.
- Confirmed HTX44 Series Fitment — Verified for HTX44K5, HTX44Y4, HTX44Y5, and HTX44K4 hydrostatic ride-on trowel models.
- Prevents Torque Slippage — A worn or missing motor key allows the drive shaft to spin independently of the hydraulic motor, causing loss of blade control and potential hydraulic system damage; this part restores full torque transfer.
- Genuine Multiquip OEM Part — Sourced directly from the Multiquip OEM parts catalog under part number 21899, not an approximated aftermarket substitute.
The hydraulic motor key is a small but critical component that locks the hydraulic motor shaft to the driven component, transmitting torque without allowing rotational slippage between the two surfaces. On HTX44 series hydrostatic ride-on trowels, the Sauer 682L9159 motor relies on this key to maintain positive drive engagement; if the key shears, wears down, or goes missing, the motor shaft will spin freely and the trowel blades will lose their driven rotation entirely. Replacing the key promptly restores the mechanical link between the hydraulic motor and the trowel drive system, getting the machine back to full operation.
Part Details
| Part Number | 21899 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | STX/HTX Hydraulic Motor Key Sauer 682L9159 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44K4 |
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.
