Multiquip 20390 QP Assembly Trigger

The Multiquip 20390 QP Assembly Trigger is a genuine OEM replacement designed for a wide range of Multiquip and Whiteman walk-behind and ride-on power trowels, including the J36, B46, HDA, JS36, BS46, and JS60 series. As a direct OEM component sourced through Multiquip's authorized parts network, the 20390 is built to the same specifications as the original part it replaces, ensuring consistent operation and proper fit without guesswork. DHS Equipment supplies this part to contractors and equipment operators who depend on accurate fitment and proven quality to keep their finishing work on schedule.

Key Features

• Genuine OEM Construction — Manufactured to the original design specification, so the trigger mechanism engages and releases with the same feel and responsiveness as the factory-installed component.
• Broad Trowel Compatibility — Fits multiple Multiquip and Whiteman power trowel models across the J36, B46, JS36, BS46, HDA, and JS60 series, covering both walk-behind and ride-on configurations.
• Direct Drop-In Replacement — The 20390 mounts in the same position and connects to the same assembly points as the original trigger, so installation follows standard service procedures.
• Restored Operator Control — A worn or damaged trigger can cause erratic engagement or loss of clutch control; replacing it with the correct OEM part restores crisp, predictable response during finishing passes.
• Operator Safety Relevance — The trigger is part of the operator control assembly; using the correct OEM trigger ensures the engagement mechanism functions as designed, maintaining safe machine handling at all blade speeds.

The QP Assembly Trigger is the operator-actuated control component that engages and disengages the trowel's drive mechanism. When the operator squeezes or releases the trigger, it signals the clutch or drive assembly to start or stop blade rotation, giving the operator direct control over the machine's output. A trigger that is worn, cracked, or mechanically degraded can produce inconsistent clutch engagement, make the machine difficult to control, or prevent the blades from stopping promptly — all of which affect both finish quality and job site safety. Replacing a faulty trigger with the correct OEM part is one of the most straightforward ways to restore full operator control to a power trowel.

For questions about fitment or to confirm this part is correct for your specific machine configuration, contact the DHS Equipment parts team before ordering.

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.