Multiquip M5424600004 DEF Supply Door

The Multiquip M5424600004 is a genuine OEM DEF Supply Door designed for the DCA Super-Silent generator series, including DCA150SSJU4F3, DCA180SSJU4F3, DCA220SSJU4F3, DCA300SSJU4F3, and DCA300SSJU4F3PD models. As a factory-sourced component, it delivers an exact fit to the original enclosure opening with no trimming or modification needed to the panel. Sourced directly through Multiquip's authorized parts network, this replacement door ensures your generator's DEF access point is properly protected and fully operational. If your existing door is damaged, corroded, or missing, M5424600004 is the correct OEM replacement to restore your unit to full working condition.

Key Features

• Genuine OEM Construction — Manufactured to Multiquip's original design specifications, ensuring the door panel aligns correctly with the enclosure frame on Super-Silent DCA series generators.
• Direct-Fit Replacement — Matches the original mounting points and hardware layout of the DEF access panel, allowing a straightforward swap on compatible models.
• Broad DCA Series Compatibility — Fits DCA150SSJU4F3, DCA180SSJU4F3, DCA220SSJU4F3, DCA300SSJU4F3, and DCA300SSJU4F3PD, covering both standard and 60Hz-rated configurations.
• Protects the DEF System Access Point — A properly functioning door shields the DEF fill port from debris, moisture, and contamination, which is critical for maintaining the generator's emissions system integrity.
• Emissions System Compliance — The DEF supply door is part of the generator's Tier 4 emissions control enclosure; keeping it intact supports correct operation of the selective catalytic reduction (SCR) system and helps avoid emissions-related fault conditions.

The DEF Supply Door is a panel component on the generator's enclosure that covers and protects the diesel exhaust fluid fill port. On Tier 4 Final diesel generators like the DCA Super-Silent series, DEF is consumed by the selective catalytic reduction system to reduce NOx emissions, and the fill port must be kept clean and securely covered to prevent fluid contamination or debris ingestion. A damaged or missing door exposes the DEF system to the elements, which can lead to fluid degradation, sensor faults, or SCR system errors that interrupt generator operation.

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.