Multiquip RE560877 DEF Backflow Line

The Multiquip RE560877 DEF Backflow Line is a genuine OEM component designed for the DCA Super-Silent generator series, including DCA150SSJU4F, DCA180SSJU4F, and DCA220SSJU4F Tier 4 models. As a direct OEM replacement, this line is manufactured to the exact routing, diameter, and connection specifications required by the DEF dosing system on these John Deere-powered units. Keeping the DEF circuit intact is critical to emissions compliance and uninterrupted generator operation, making part-for-part accuracy essential. DHS Equipment supplies this part directly, so you can confirm fitment by model code before ordering.

Key Features

• OEM-Grade DEF Compatibility — Constructed from materials rated for continuous contact with Diesel Exhaust Fluid, resisting chemical degradation that commonly causes aftermarket lines to crack or swell prematurely.
• Exact Routing and Connection Fit — Matches the factory line length, end fittings, and bend profile of the original, allowing direct installation into the DEF backflow circuit without rerouting or adapting connections.
• Confirmed Fitment for DCA Super-Silent Series — Verified for DCA150SSJU4F, DCA180SSJU4F, and DCA220SSJU4F Tier 4 super-silent generators across both 60 Hz configurations.
• Maintains SCR System Function — A correctly functioning backflow line returns unused DEF to the reservoir, keeping the selective catalytic reduction system primed and preventing air locks or dosing errors.
• Emissions Compliance Critical — On Tier 4 diesel generators, a failed DEF line can trigger fault codes, force the unit into reduced power mode, or cause an emissions compliance failure — genuine OEM construction helps prevent these disruptions.

The DEF backflow line is part of the Diesel Exhaust Fluid delivery circuit in Tier 4 emissions-compliant generators. Its job is to return excess DEF from the dosing pump back to the storage tank, maintaining proper fluid pressure and preventing the system from running dry. When this line cracks, leaks, or collapses, the SCR system loses its ability to accurately dose DEF into the exhaust stream, which can result in fault codes, derated output, and failed emissions inspections — making prompt replacement with a correct OEM part essential.

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.