Multiquip 21865 Seat Adjuster Kit

The Multiquip 21865 Seat Adjuster Kit is a genuine OEM component designed for Whiteman ride-on power trowels and roller screeds, including STXDF, STX6H, HTX6H, HTX44 series, HHX series, and WRS series equipment. This kit restores proper operator seat positioning to ensure the seat slides, locks, and holds securely under working conditions. As a direct OEM replacement, part number 21865 is built to the same specifications as the original, making it a straightforward swap with no guesswork on fitment. DHS Equipment stocks this genuine Multiquip part to keep your machine back in service fast.

Key Features

• Genuine OEM Construction — Manufactured to the exact mechanical tolerances required for seat adjustment hardware, ensuring the adjuster engages and locks at each position the way the original did.
• Direct-Fit Replacement — Part number 21865 installs into the existing seat mounting track without modification, using the same mounting points as the factory-fitted assembly.
• Broad Fitment Coverage — Compatible with a wide range of Whiteman ride-on power trowels and roller screeds, including STXDF, STX6H, STXD6i, HTX6H, HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, HTXG6DF, HTXD6i, HHX series, JWN24 series, WRS5200, and WRSPUDF models.
• Operator Control and Stability — A functioning seat adjuster lets operators dial in their position relative to the controls, directly affecting how precisely they can steer and manage blade pitch on a ride-on trowel or screed.
• Operational Safety Relevance — A worn or broken seat adjuster can allow the seat to shift unexpectedly during operation, compromising the operator's ability to maintain stable control of the machine — replacing it promptly is a straightforward safety measure.

The seat adjuster kit controls fore-and-aft positioning of the operator seat on ride-on power trowels and roller screeds. It typically consists of the slide mechanism, locking hardware, and associated fasteners that allow the seat to be set to the operator's reach and held firmly in place during use. When the adjuster wears out or breaks, the seat may slide freely or fail to lock at the chosen position, which reduces operator comfort and control. Replacing the full kit rather than individual components restores the complete function of the adjustment system.

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.