Multiquip RE552175 DEF Supply Module

The Multiquip RE552175 DEF Supply Module is a genuine OEM component designed for the DCA Series ultra-silent diesel generator lineup, including DCA70SSJU4F, DCA150SSJU4F, DCA180SSJU4F, DCA220SSJU4F, and DCA300SSJU4F models. Sourced directly from Multiquip, this part meets the exact design and material specifications of the original unit it replaces. If your generator's DEF system is throwing fault codes, failing to dose correctly, or showing signs of pump or sensor failure, RE552175 is the correct replacement module to restore full Tier 4 emissions compliance. Confirm your model code against the fitment list before ordering to ensure a direct, hassle-free installation.

Key Features

• Genuine OEM DEF System Integrity — Built to the exact dosing tolerances and sensor calibration specs required for Tier 4 Final emissions compliance on DCA Series generators.
• Direct-Swap Installation — Engineered to the original mounting configuration and connector layout, allowing straightforward removal and reinstallation without custom adaptation.
• Broad DCA Series Fitment — Compatible with DCA70SSJU4F, DCA150SSJU4F, DCA180SSJU4F, DCA220SSJU4F, DCA300SSJU4F, and their respective variant suffixes (4F2, 4F3, 4F3PD) in both 50Hz and 60Hz configurations.
• Restores Proper DEF Dosing — A failed or degraded DEF supply module disrupts urea injection timing, triggering engine derate or shutdown; replacing it returns the aftertreatment system to correct operation.
• Emissions System Compliance — Critical for maintaining EPA Tier 4 Final certification on regulated jobsites where generator emissions documentation is required.

The DEF (Diesel Exhaust Fluid) supply module is the heart of the selective catalytic reduction (SCR) aftertreatment system on Tier 4 Final diesel generators. It draws DEF from the tank, meters it precisely, and injects it into the exhaust stream to convert harmful nitrogen oxides into harmless nitrogen and water vapor. When the module degrades or fails, the generator's ECU detects the fault and will progressively derate engine output — or shut the unit down entirely — to remain within emissions compliance limits. Replacing a faulty module with a genuine OEM unit like RE552175 restores proper injection control and prevents costly engine protection events in the field.

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.