The Multiquip 12789 Gearbox Assembly LS HTO/N (1.25) is a genuine OEM component designed for the HTN27K and HTN28K mechanical ride-on power trowels. As a direct Multiquip OEM part, 12789 is manufactured to the exact specifications required for proper power transfer and blade rotation on these machines. This assembly is a confirmed fit for HTN27K and HTN28K units, eliminating guesswork when sourcing a replacement. DHS Equipment stocks this part to keep your trowel back in operation with confidence.
Key Features
- Genuine OEM Gearbox Construction — Machined and assembled to Multiquip's original design tolerances, ensuring correct gear mesh, load rating, and output ratio (1.25) for this trowel application.
- Drop-In Replacement for HTN27K and HTN28K — Engineered to mount directly to the existing drive train on HTN27K and HTN28K mechanical ride-on trowels with no adaptation needed.
- Correct 1.25 Output Ratio — The specified 1.25 ratio is critical to maintaining proper blade speed and torque delivery; substituting an incorrect ratio alters finishing performance and can stress drivetrain components.
- Sustained Blade Drive Reliability — A properly functioning gearbox maintains consistent rotational force to the finishing blades; a worn or failing unit causes uneven blade speed, vibration, and loss of surface quality.
- Verified OEM Part Number — Sold under the exact Multiquip part number 12789, so you can cross-reference your machine's parts manual with confidence before ordering.
The gearbox assembly on a mechanical ride-on power trowel transfers engine power to the finishing blade spider arms, controlling both the speed and torque delivered to the blades as they work the concrete surface. The 1.25 gear ratio in this assembly is a calibrated specification — if the gearbox wears, seizes, or loses lubrication integrity, blade rotation becomes inconsistent, which directly impacts the flatness and finish quality of the slab. Replacing the gearbox with the correct OEM assembly restores the mechanical drive to its original operating spec and protects downstream components from the stress caused by a failing unit.
Part Details
| Part Number | 12789 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Gearbox Assembly LS HTO/N (1.25) |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTN27K |
| Whiteman Ride-On Power Trowels | HTN28K |
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.
