Multiquip 21856 Hydraulic Motor Sauer Danfoss Omtw400

The Multiquip 21856 is a genuine OEM Hydraulic Motor Sauer Danfoss Omtw400 designed for STX and HTX series hydrostatic ride-on power trowels. As a direct OEM replacement, part 21856 meets the original engineering specifications required to keep blade control and drive response performing as intended on these machines. This motor is confirmed to fit STXD6i, STX55J6, STX55Y6, HTX6H, HTX44Y5, HTX44Y4, HTX44K5, and HTX44K4 models. Sourcing a genuine Multiquip component ensures that the hydraulic system on your ride-on trowel operates with the correct torque output and displacement characteristics the machine was built around.

Key Features

• Genuine OEM Hydraulic Output Spec — Matched to the displacement and torque rating of the original Sauer Danfoss Omtw400 motor, ensuring the hydraulic circuit operates within designed pressure and flow parameters.
• Direct Bolt-On Installation — Engineered to the same port configuration and mounting interface as the original, allowing a straightforward swap without machining or adapters.
• Broad STX and HTX Fitment — Confirmed for STXD6i, STX55J6, STX55Y6, HTX6H, HTX44Y5, HTX44Y4, HTX44K5, and HTX44K4 hydrostatic ride-on trowels.
• Blade Control Integrity — A correctly functioning hydraulic motor maintains consistent blade pitch response across the trowel deck; a worn or failing motor causes sluggish or uneven blade adjustment that degrades finish quality.
• Verified Multiquip Part Number — Sold under part number 21856, matching Multiquip's OEM parts catalog for confident, accurate ordering.

The hydraulic motor on a hydrostatic ride-on trowel is the muscle behind both blade pitch adjustment and machine drive. It converts hydraulic pressure generated by the engine-driven pump into rotational or linear force that moves the trowel arms and propels the machine across the slab. When this motor begins to wear — through internal leakage, seal degradation, or bearing failure — operators will notice a loss of blade response, inconsistent finishing pressure, or reduced drive authority, all of which compromise the quality of the concrete surface and extend finishing time.

For product questions or fitment assistance, contact the DHS Equipment team directly.

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.