Multiquip 20660-001 Main Shaft M20/30 Round 40 1/2"

The Multiquip 20660-001 is a genuine OEM Main Shaft M20/30 Round 40 1/2" designed for HTX44 and STX55 series hydrostatic ride-on power trowels. As a direct OEM replacement sourced through Multiquip's authorized parts network, this shaft is manufactured to the same specifications as the original component installed at the factory. Confirmed fitment includes HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 models. When you need to get your trowel back to work fast, ordering the correct OEM part the first time is the most reliable path to a complete repair.

Key Features

• Genuine OEM Shaft Integrity — Manufactured to Multiquip's original dimensional and metallurgical standards, ensuring the shaft withstands the rotational loads and torque demands of hydrostatic trowel operation.
• Direct-Fit Replacement — Matched to the M20/30 shaft position and 40 1/2" length specification, this part installs directly into the trowel's rotor drive assembly without modification.
• Broad HTX44 and STX55 Compatibility — Fits HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6, covering both Kubota and Yanmar-powered variants across these two series.
• Restores Full Blade Drive Performance — A worn or damaged main shaft causes blade wobble, uneven finishing, and loss of pitch control. Replacing it restores consistent rotor engagement and a smooth, level finish pass.
• Authorized OEM Part — Sold by DHS Equipment as an authorized Multiquip parts distributor, so you receive the exact part number 20660-001 verified against current Multiquip parts documentation.

The main shaft is the central rotating member that transfers drive force from the trowel's hydraulic motor to the rotor arms and finishing blades. It must maintain precise alignment and dimensional accuracy under continuous rotational stress — any bending, wear, or surface damage causes vibration, uneven blade contact with the slab surface, and accelerated wear on surrounding bearings and housings. On hydrostatic units like the HTX44 and STX55 series, where blade pitch is continuously adjusted through the rotor mechanism, a compromised main shaft directly undermines the operator's ability to control finish quality. Replacing this component with the correct OEM shaft restores the drive geometry the machine was designed around.

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.