Wacker Neuson 5100078973 DEF Tank Header Assembly

The Wacker Neuson DEF Tank Header Assembly is a genuine OEM component designed for the RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB compact track loaders. As a direct factory part, it is manufactured to the exact specifications required by Wacker Neuson and integrates seamlessly with the machine's diesel exhaust fluid system. Sourcing the correct OEM assembly ensures the DEF system operates within the precise flow and sealing parameters the machine was engineered around. If your RC110 or RC110p series machine is showing DEF system faults or leaks, this is the verified replacement assembly to restore proper function.

Key Features

• OEM-Specified DEF Compatibility — Manufactured to resist the corrosive properties of diesel exhaust fluid, with materials and seals rated for continuous DEF exposure — critical for preventing internal degradation and contamination.
• Direct Drop-In Installation — Engineered to mount directly to the DEF tank on RC110 and RC110p series machines, aligning with existing port connections and hardware without adaptation.
• Confirmed Fitment for RC110 Series — Covers all four RC110 configurations: RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB compact track loaders.
• Maintains DEF System Integrity — A properly functioning header assembly keeps DEF flow consistent and sealed, allowing the SCR emissions system to operate correctly and preventing fault codes that can limit machine power or trigger a derate condition.
• Emissions System Compliance — The DEF system is a regulated emissions component; using a genuine OEM assembly helps ensure your machine continues to meet required emissions standards and avoids regulatory non-compliance issues on the worksite.
• Genuine Wacker Neuson Part — Supplied under part number 5100078973 directly from the Wacker Neuson OEM parts program, ensuring the assembly matches the original production specification for your machine.

The DEF tank header assembly serves as the central connection point between the diesel exhaust fluid tank and the DEF dosing system on Tier 4 Final machines. It houses the fluid pickup, return, and level sensing interfaces, allowing the machine's selective catalytic reduction system to accurately meter DEF into the exhaust stream and reduce nitrogen oxide emissions. When the header assembly fails — whether through cracking, seal degradation, or connector damage — the machine may trigger emissions-related fault codes, enter a power derate mode, or lose the ability to accurately monitor DEF levels, all of which can halt productive 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.