Multiquip 21389 Lever W/A Pump Control Linkage

The Multiquip 21389 Lever W/A Pump Control Linkage is a genuine OEM component designed for HTX44 and STX55 series hydrostatic ride-on power trowels. This part is sourced directly through Multiquip's authorized supply chain, ensuring it meets the exact specifications required for proper hydraulic pump control operation. Compatible with HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 models, the 21389 is the correct direct replacement for worn or damaged linkage assemblies on these machines. DHS Equipment supplies this genuine OEM part to keep your ride-on trowel operating as intended.

Key Features

• Genuine OEM Construction — Manufactured to Multiquip's exact tolerances for the HTX44 and STX55 hydraulic pump control system, ensuring proper lever travel and positive engagement with the pump linkage circuit.
• Direct-Fit Assembly — Supplied as a complete Lever W/A assembly that connects directly to the existing pump control linkage mounting points — no modification to hardware or brackets needed.
• Broad HTX44 and STX55 Coverage — Fits HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 hydrostatic ride-on trowel models.
• Hydraulic Drive Responsiveness — A properly functioning pump control linkage delivers smooth, predictable hydraulic response for blade speed and drive control; a worn or bent lever assembly causes erratic machine behavior and loss of operator control.
• Operator Safety Relevance — The pump control linkage is a critical input between the operator and the trowel's hydraulic drive system — using the correct OEM assembly maintains the intended control feel and response characteristics designed into these machines.

The pump control linkage lever assembly connects the operator's physical input to the hydraulic pump that drives the trowel's blade and propulsion systems. On hydrostatic ride-on trowels like the HTX44 and STX55 series, this linkage translates lever movement into precise hydraulic pressure changes that control both blade pitch and machine travel. When this assembly wears, bends, or develops play, the operator loses accurate control over the trowel's response — resulting in inconsistent blade speed, reduced finish quality, and potentially unsafe operating conditions. Replacing the Multiquip 21389 restores the mechanical connection to spec and returns full hydraulic control responsiveness to the machine.

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.