The Multiquip 20407 is a genuine OEM Gearbox Assembly designed for Whiteman walk-behind and ride-on power trowels, including the BS90C, BH11C, BH90C, B46, J36-M30 series, JS60C, JH90C, JH55C, BS46H11, BS46H90, JS36H90, JS36H55, and B46S90. As a factory-authorized component, part 20407 is manufactured to the exact tolerances required to maintain proper blade pitch, rotation, and power transmission on these machines. DHS Equipment stocks this part as a direct OEM replacement, so you can restore your trowel to full operating specification without guesswork. Whether you are servicing a walk-behind or a ride-on Whiteman unit, the 20407 Gearbox Assembly is the correct factory part for the job.
Key Features
- Exact OEM Gear Tolerancing — Manufactured to factory specifications for gear mesh, bearing clearance, and torque transfer — critical for consistent blade rotation on Whiteman trowels.
- Drop-In Installation — Mounts directly to the trowel drive system using the original bolt pattern and shaft interface, requiring no modification to the machine.
- Broad Whiteman Trowel Compatibility — Fits BS90C, BH11C, BH90C, B46, J36-M30 series, JS60C, JH90C, JH55C, BS46H11, BS46H90, JS36H90, JS36H55, and B46S90 models.
- Restored Power Transmission — A worn or failed gearbox causes blade pitch loss, uneven finishing, and drive slippage; replacing it with the correct OEM assembly restores full troweling performance.
- Operational Safety — A properly functioning gearbox keeps blade pitch control responsive and predictable, which is essential for safe operation on a spinning trowel head.
The gearbox assembly is the central mechanical link between the trowel's engine output and its rotating blade arms. It transfers engine power to the blade spider, controlling both rotation speed and blade pitch angle to produce a smooth, finished concrete surface. When the gearbox wears or fails, operators will notice symptoms such as inconsistent blade pitch, unusual noise from the drive train, vibration, or a complete loss of blade rotation — any of which will halt finishing work and can result in a ruined concrete pour if not addressed quickly.
For fitment questions or help confirming that Multiquip part 20407 is correct for your specific machine, contact the DHS Equipment team directly.
Part Details
| Part Number | 20407 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Gearbox Assembly |
Compatibility & Fitment
| Name | Model |
|---|---|
| International Walk-Behind Power Trowels | BS90C |
| Whiteman Walk-Behind Power Trowels | BH11C |
| Whiteman Walk-Behind Power Trowels | BH90C |
| Whiteman Walk-Behind Power Trowels | B46 |
| Whiteman Walk-Behind Power Trowels | J36-M30 Series |
| International Walk-Behind Power Trowels | JS60C |
| Whiteman Walk-Behind Power Trowels | JH90C |
| Whiteman Walk-Behind Power Trowels | JH55C |
| International Walk-Behind Power Trowels | BS46H11 |
| International Walk-Behind Power Trowels | BS46H90 |
| International Walk-Behind Power Trowels | JS36H90 |
| International Walk-Behind Power Trowels | JS36H55 |
| Whiteman Ride-On Power Trowels | J36-M30 |
| Whiteman Walk-Behind Power Trowels | B46S90 |
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.
