The Multiquip 2115 O-Ring Size-018 Buna-N is a genuine OEM service part designed for Whiteman hydrostatic and heavy-duty ride-on power trowel models including STX55, HTXD6i, STXD6i, HTX44, STX55J6, and JTO-Series equipment. As a direct OEM replacement, 2115 ensures the correct material grade and dimensional spec for a proper seal in hydraulic and fluid-circuit applications on these machines. DHS Equipment supplies this part as an authorized Multiquip dealer, so you can order with confidence knowing you are receiving the exact component specified for your machine. Verify your model against the fitment list before ordering to confirm compatibility.
Key Features
- Buna-N Elastomer Grade — Nitrile rubber construction provides strong resistance to hydraulic fluid, petroleum oils, and grease — exactly the material demands placed on sealing components in ride-on trowel hydraulic circuits.
- Size-018 Dimensional Accuracy — Manufactured to the precise cross-section and inner diameter of the Size-018 standard, ensuring correct compression when seated in its groove without over- or under-compression.
- Genuine OEM Component — Sourced directly through Multiquip's OEM supply chain, this part carries the same material and dimensional specification as the original installed at the factory.
- Broad Ride-On Trowel Fitment — Compatible with STX55, HTXD6i, STXD6i, HTX44Y4, HTX44Y5, HTX44K4, HTX44K5, STX55J6, and JTO-Series Whiteman ride-on power trowels.
- Hydraulic Sealing Integrity — A worn or damaged O-ring in a trowel's hydraulic system can cause fluid leaks, loss of blade pitch control, and drive pressure drop — replacing with the correct part restores full system function.
- Fuel and Fluid System Safety — Correct elastomer grade and sizing matter in pressurized circuits; using a non-specified O-ring risks seal failure under operating pressure in hydraulic and fuel-adjacent applications.
An O-ring is a circular elastomeric seal used to prevent fluid or gas from passing between mating components — typically between a housing bore and a shaft, fitting, or plug. In hydrostatic ride-on trowels like the STX and HTX series, O-rings appear throughout the hydraulic circuit, blade pitch control assemblies, and fluid connections, where they maintain pressure and prevent leaks. When an O-ring degrades — through heat cycling, fluid exposure, or compression set — it loses its ability to seal, leading to visible fluid leaks, reduced hydraulic pressure, and eventual loss of blade or drive control if not addressed promptly.
Part Details
| Part Number | 2115 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | O-Ring Size-018 Buna-N |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | STX55Y6 |
| Whiteman Ride-On Power Trowels | HTXD6i |
| Whiteman Ride-On Power Trowels | STXD6i |
| Whiteman Ride-On Power Trowels | HTX44Y5 |
| Whiteman Ride-On Power Trowels | HTX44Y4 |
| Whiteman Ride-On Power Trowels | STX55J6 |
| Whiteman Ride-On Power Trowels | HTX44K5 |
| Whiteman Ride-On Power Trowels | HTX44K4 |
| Whiteman Ride-On Power Trowels | JTO-SERIES |
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.
