Multiquip 21394 Pump Control Hex Rod 8.0L

The Multiquip 21394 is a genuine OEM Pump Control Hex Rod 8.0L designed for HTX44 and STX55 series hydrostatic ride-on power trowels, including the HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6. As a factory-original component, part 21394 is manufactured to the same specification as the rod installed at the time of production, ensuring a direct, hassle-free installation. DHS Equipment supplies this part directly as an authorized Multiquip source, so you can order with confidence knowing you are receiving the correct component for your machine.

Key Features

• Genuine OEM Precision Geometry — Hex-profile rod machined to exact dimensional tolerances required for correct engagement with the hydraulic pump control linkage.
• Direct-Install Replacement — Matches the original 8.0L rod length and hex specification, connecting directly to the pump control circuit with no reworking of adjacent linkage components.
• Broad HTX44 and STX55 Compatibility — Confirmed fitment across HTX44K4, HTX44K5, HTX44Y4, HTX44Y5, STX55J6, and STX55Y6 hydrostatic ride-on trowels.
• Consistent Hydraulic Pump Response — A correctly dimensioned control rod maintains smooth, repeatable pump actuation so blade speed and drive response stay predictable across the full operating range.
• Hydraulic System Integrity — Using the correct OEM rod prevents misalignment in the pump control circuit, which can lead to erratic trowel response or uneven blade pitch if a non-spec component is substituted.

The pump control hex rod is a critical linkage component in the hydraulic drive system of hydrostatic ride-on trowels. It transmits mechanical input from the operator controls to the hydraulic pump, regulating flow and pressure to manage blade speed and machine movement. When this rod is worn, bent, or dimensionally incorrect, the pump control circuit loses precision, resulting in inconsistent blade pitch response, sluggish drive behavior, or difficulty maintaining steady finishing passes. Replacing it with the correct OEM part restores accurate, responsive control across the full operating cycle.

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.