Wacker Neuson 5100078823 Def Dosing Unit Pump

The Wacker Neuson Def Dosing Unit Pump is a genuine OEM component designed for the RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB series rollers. As a factory-original part, the is built to the same specifications as the unit installed at the factory, ensuring correct dosing rates and proper integration with the machine's emissions control system. Confirm your model number against the fitment list before ordering — this pump covers all four RC110 and RC110p configurations listed above.

Key Features

• Correct Dosing Output: — Engineered to deliver the precise DEF flow rate required by the RC110 series emissions system, maintaining accurate reagent injection at every duty cycle.
• Genuine OEM Construction: — Factory-original Wacker Neuson part manufactured to the same tolerances and material standards as the pump it replaces, with no substitutions in componentry.
• Direct-Fit for RC110 and RC110p Series: — Confirmed fitment across RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB configurations, connecting to existing harness and fluid lines without adaptation.
• Emissions System Integrity: — A functioning dosing pump is critical for Selective Catalytic Reduction (SCR) operation; a failed or degraded pump can trigger fault codes, derate engine output, and cause the machine to shut down on-site.
• Regulatory Compliance Support: — Keeping the DEF dosing system operating correctly ensures the machine continues to meet applicable Tier 4 Final / Stage V emissions standards — important for site access and legal operation.

The DEF dosing unit pump is the heart of the machine's Selective Catalytic Reduction emissions system. It draws diesel exhaust fluid from the tank and delivers a precisely metered volume into the exhaust stream, where it reacts with nitrogen oxides to reduce harmful emissions. When the pump fails or loses prime, DEF injection stops, the SCR system goes offline, and the engine management system will typically derate power or trigger a shutdown to keep the machine within emissions compliance — making prompt replacement essential to keeping the roller working.

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.