The Multiquip 20639 Trunnion W/A Pivot and Pitch is a genuine OEM component designed for HTX and STX series hydrostatic ride-on power trowels, including the HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, and STXD6i. As a direct-source Multiquip OEM part, 20639 delivers an exact match to the original specification — no guesswork, no fitment concerns. This trunnion assembly is a precision-machined structural component critical to the blade pitch and pivot system, and sourcing the correct OEM unit is essential to maintaining accurate blade control and safe trowel operation.
Key Features
- Genuine OEM Construction — Machined and validated to Multiquip's original design tolerances for the trunnion pivot and pitch mechanism, ensuring the assembly seats and articulates exactly as intended.
- Direct-Fit Replacement — Engineered as a drop-in unit for HTX44 and STX55 series machines; connects directly to the existing blade pitch linkage without modification to surrounding hardware.
- Broad HTX and STX Series Compatibility — Confirmed fitment across HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, and STXD6i hydrostatic ride-on trowels.
- Blade Pitch Accuracy Restored — A worn or damaged trunnion causes inconsistent blade angle and uneven concrete finishing; replacing with 20639 restores full pitch control and a consistent float finish.
- Operational Safety — The pivot and pitch trunnion is a load-bearing articulating component; using a correctly rated OEM unit maintains the structural integrity of the blade control system under full operating loads.
The trunnion assembly on a ride-on power trowel serves as the mechanical pivot point that allows each rotor blade to change its pitch angle during operation. By controlling blade pitch, the operator can transition the machine between floating, finishing, and burnishing passes on a concrete slab. When the trunnion wears, cracks, or seizes, blade pitch becomes erratic or locks in a fixed position — resulting in poor surface quality, uneven finishing patterns, and increased stress on the rotor drive components. Replacing a failed trunnion promptly with the correct OEM part keeps the blade pitch system responsive and protects the surrounding drivetrain from secondary damage.
For questions about fitment or to confirm compatibility with your specific machine configuration, contact DHS Equipment directly.
Part Details
| Part Number | 20639 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Trunnion W/A Pivot and Pitch |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STXD6i |
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.
