Multiquip 21508 Engine Package Stha55Jd

The Multiquip 21508 Engine Package Stha55Jd is a genuine OEM engine package designed for the STX55J6 and STX55Y6 hydrostatic ride-on power trowels. Sourced directly from Multiquip, this assembly carries the same build specification as the original unit installed at the factory, ensuring the machine performs exactly as engineered. If you are restoring a worn or failed powerplant on your STX55 series trowel, part number 21508 is the correct direct replacement for both the STX55J6 and STX55Y6 models.

Key Features

• Genuine OEM Engine Assembly — Manufactured to Multiquip's exact output and torque specifications for the STX55 hydrostatic trowel platform, ensuring the hydraulic drive system receives the correct power input.
• Direct-Fit Replacement — Engineered to mount and connect to the existing engine cradle, fuel, and hydraulic interfaces on the STX55J6 and STX55Y6 without requiring custom fabrication or adapter hardware.
• STX55 Series Compatibility — Confirmed fitment for STX55J6 and STX55Y6 hydrostatic ride-on power trowels; always cross-reference your serial plate before ordering.
• Full Power Restoration — A properly functioning engine package delivers consistent hydraulic pressure to the blade pitch and drive systems, allowing the trowel to maintain finish quality and operator control across the full working pass.
• Complete Package — Supplied as a full engine package rather than individual components, simplifying the replacement process and reducing the number of separate parts required to complete the repair.

The engine package is the primary power source for the STX55 series hydrostatic ride-on trowel, driving the hydraulic system that controls both blade pitch and machine travel. When the engine loses power or fails entirely, the trowel cannot generate the hydraulic pressure needed to adjust the rotor blades or propel the machine, bringing finishing operations to a halt. Replacing the engine package with a genuine Multiquip 21508 assembly restores full hydraulic output and returns the trowel to its designed operating capability.

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.