Multiquip 1143 O-Ring Size-254 Buna-N

The Multiquip 1143 O-Ring Size-254 Buna-N is a genuine OEM seal designed for Whiteman and international ride-on and walk-behind power trowel series, including HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, HHN34TVD, HHN31V, HTN28K, HTN27K, JWN24, and J36E2 models. As a direct OEM replacement, this part is manufactured to the same specification as the original, ensuring correct compression and sealing performance when installed. Sourced directly through authorized Multiquip channels, the 1143 is the exact seal called out in the OEM parts documentation for these trowel families. DHS Equipment supplies this part to keep your concrete finishing equipment running without compromise.

Key Features

• Buna-N Elastomer Construction — Buna-N (nitrile rubber) compound provides strong resistance to hydraulic fluid, fuel, and oil exposure common in power trowel operating environments.
• Size-254 Cross-Section Conformance — Molded to AS568 Size-254 dimensional standards, this O-ring seats correctly in its designated groove without under-compression or over-compression that can cause leaks.
• Genuine OEM Part — Manufactured to Multiquip's original specification, confirming the same material durometer and geometry as the part it replaces.
• Broad Trowel Family Coverage — Fits across the HTX, HHN, HTN, JWN, and J Series ride-on and walk-behind power trowel lines, making it a versatile stocking item for fleets running multiple Whiteman models.
• Maintains Hydraulic and Fluid Circuit Integrity — A correctly seated O-ring prevents fluid bypass and pressure loss in hydraulic circuits, keeping blade pitch control and drive response sharp and consistent.

An O-ring is a molded elastomeric seal used at fluid connections, hydraulic fittings, and component interfaces to prevent leakage under pressure. In power trowels, O-rings are found throughout the hydraulic system that controls blade pitch and machine drive — a failed or degraded seal allows hydraulic fluid to bypass its intended circuit, resulting in sluggish blade response, inconsistent finishing pressure, or loss of drive function. Replacing a worn O-ring promptly with a correctly sized, correct-material part restores the sealing integrity of the circuit and prevents secondary damage from fluid loss or contamination.

Part Details

Compatibility & Fitment

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.