The Multiquip 21115 Straight Fitting 6MJ-6MO Long is a genuine OEM hydraulic fitting designed for HTX44 and STX55 series ride-on power trowels. As a direct factory replacement, this fitting ensures a proper, leak-free connection within the hydraulic circuit of your machine. Confirmed fitment includes HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, and HTXD6i models.
Key Features
- Genuine OEM Construction — Manufactured to Multiquip's exact thread form and dimensional tolerances, ensuring a pressure-rated seal that aftermarket fittings may not consistently match.
- Direct Hydraulic Line Replacement — Straight male JIC to male ORB configuration (6MJ-6MO) threads in exactly as the original, with no rework to existing hydraulic lines or ports.
- Broad HTX and STX Series Fitment — Compatible with HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, STX55Y6, STXD6i, and HTXD6i ride-on trowel models.
- Hydraulic Integrity Under Load — A correctly seated fitting maintains consistent hydraulic pressure, keeping blade pitch control and drive response sharp. A worn or improperly sized fitting invites fluid weeping and pressure drop that degrades trowel performance.
- Fluid System Safety — Hydraulic fittings are a pressure boundary component; using the correct OEM-spec fitting reduces the risk of connection failure under operating pressure.
A straight hydraulic fitting serves as a rigid union between two hydraulic lines or between a line and a port, maintaining sealed, pressurized fluid flow across the connection. In hydrostatic ride-on trowels like the HTX44 and STX55 series, the hydraulic system governs both blade pitch adjustment and machine drive — so any leak or pressure loss at a fitting directly affects how the operator controls the trowel. When a fitting corrodes, cross-threads, or fails to seal, fluid bypass causes sluggish or unresponsive blade and drive behavior, making prompt replacement with the correct OEM part essential to keeping the machine working as intended.
DHS Equipment is an authorized Multiquip parts dealer. If you need help confirming that 21115 is the right fitting for your machine, contact our parts team with your model and serial number.
Part Details
| Part Number | 21115 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Straight Fitting 6MJ-6MO Long |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STX55Y6 |
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.
