The Multiquip 21811 Gear Box Cover Machined is a genuine OEM component designed for Whiteman and international heavy-duty ride-on power trowel models including HHNG5, HHXDF4-DF5, HHXD5, HHXD5-ES, HHXG5, HHN34TVD, HHN31V, and EHHNK5. Sourced directly from Multiquip, part number 21811 is precision-machined to meet exact OEM tolerances, ensuring a flush, secure fit at the gear box housing. Confirm your model code before ordering — this cover is engineered specifically for the HHN series and HHXD/HHXG family of ride-on trowels.
Key Features
- Precision-Machined OEM Construction — Manufactured to exact dimensional tolerances required at the gear box interface, ensuring consistent sealing surface contact and proper alignment of internal drive components.
- Direct-Fit Replacement — Bolt pattern and housing geometry match the original cover, allowing straightforward installation without rework or shimming on compatible HHN and HHXD/HHXG series trowels.
- Broad HHN Series Compatibility — Confirmed fitment across HHNG5, HHXDF4-DF5, HHXD5, HHXD5-ES, HHXG5, HHN34TVD, HHN31V, and EHHNK5 ride-on power trowels.
- Protects Critical Gear Train Components — A correctly seated gear box cover keeps lubricant contained and contaminants out, directly supporting consistent blade pitch control and drive performance during finishing operations.
- Genuine Multiquip OEM Part — Supplied as an authentic Multiquip component, so material grade and machined surface finish match what left the factory originally — not an approximation.
The gear box cover on a ride-on power trowel seals and protects the gear assembly that translates engine power into controlled blade rotation and pitch adjustment. It retains gear lubricant within the housing while keeping concrete dust, moisture, and debris away from the gear train. When this cover is cracked, warped, or improperly seated, lubricant escapes and contaminants enter — leading to accelerated gear wear, inconsistent blade response, and potential gear box failure mid-pour. Replacing a damaged cover promptly with a properly machined OEM unit like the Multiquip 21811 keeps the gear box sealed and the trowel performing as intended.
Part Details
| Part Number | 21811 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Gear Box Cover Machined |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HHNG5 |
| Whiteman Ride-On Power Trowels | HHXDF4-DF5 |
| International Ride-On Power Trowels | EHHNK5 |
| Whiteman Ride-On Power Trowels | HHXD5 |
| Whiteman Ride-On Power Trowels | HHN34TVD |
| Whiteman Ride-On Power Trowels | HHXD5-ES |
| Whiteman Ride-On Power Trowels | HHXG5 |
| Whiteman Ride-On Power Trowels | HHN31V |
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.
