The Multiquip 21055 Fitting 90 16Mo-16Mo is a genuine OEM hydraulic fitting designed for the STX55Y6 and STX55J6 hydrostatic ride-on power trowels. As a direct factory replacement, this 90-degree fitting ensures the correct fluid routing geometry within the hydraulic system, maintaining proper line orientation and leak-free connections. Sourced directly through Multiquip's OEM supply chain, part number 21055 is built to the same specification as the original component installed at the factory. If you're servicing an STX55Y6 or STX55J6 trowel, verifying you have the correct fitting before reassembling hydraulic lines will save time and prevent costly rework.
Key Features
- Genuine OEM Hydraulic Fitting: — Manufactured to Multiquip's original flow-path and thread specification, ensuring correct pressure rating and a leak-free seal under operating conditions.
- 90-Degree Elbow Configuration: — The right-angle design routes hydraulic lines cleanly around tight clearances in the trowel's hydraulic circuit, maintaining the factory line routing without bending or stressing hoses.
- 16Mo-16Mo Thread Pairing: — Both ports are matched 16Mo (Male O-Ring) threads, so the fitting connects directly to existing hydraulic lines on the STX55 platform without adapters or thread modifications.
- Confirmed Fitment for STX55 Series: — Verified for the STX55Y6 and STX55J6 super-sized hydrostatic ride-on trowels, two of the most widely used finishing machines in commercial flatwork.
- Hydraulic Integrity Under Load: — A worn or damaged fitting on a hydrostatic trowel can cause pressure loss, erratic blade pitch response, or drive instability; replacing it with the correct OEM part restores consistent hydraulic control.
- Fuel and Fluid System Safety: — Hydraulic fittings on ride-on trowels operate under sustained pressure; using the correct OEM-rated fitting minimizes the risk of line failure or fluid leaks during operation.
A hydraulic fitting like the Multiquip 21055 serves as a directional connector within the trowel's hydraulic circuit, changing the flow path of pressurized fluid by 90 degrees to accommodate the machine's internal layout. On hydrostatic ride-on trowels such as the STX55Y6 and STX55J6, hydraulic pressure controls both blade pitch adjustment and ground drive, making every fitting in the circuit critical to smooth, responsive machine operation. When a fitting cracks, strips, or develops a weeping leak, hydraulic pressure drops and the operator loses precise control over blade angle and forward motion — a fitting replacement is one of the most straightforward ways to restore full system integrity.
Part Details
| Part Number | 21055 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Fitting 90 16Mo-16Mo |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | STX55J6 |
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.
