Wacker Neuson 5100078830 Def Line

The Wacker Neuson Def Line is a genuine OEM component designed for the RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB compact track loaders. As a factory-sourced part, it is manufactured to the exact specifications required for proper diesel exhaust fluid delivery within the machine's aftertreatment system. Sourcing the correct DEF line is critical to keeping emissions controls functioning within spec and avoiding fault codes or derated performance. Confirm your model number before ordering to ensure a direct-fit installation.

Key Features

• OEM-Grade Fluid Integrity — Manufactured from materials rated to handle diesel exhaust fluid without degradation, cracking, or chemical incompatibility over time.
• Drop-In Routing Match — Engineered to the original line path and connection points, so it seats correctly at both the DEF tank and dosing module ends without rerouting or adapting fittings.
• Verified RC110 and RC110p Fitment — Confirmed for RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB variants — covers both standard and pressurized cab configurations in the RC110 series.
• Emissions System Protection — A correctly functioning DEF line maintains steady fluid flow to the SCR system, preventing fault codes, engine derating, and failed emissions compliance checks.
• Emissions Compliance Critical — A leaking or damaged DEF line can interrupt fluid delivery to the selective catalytic reduction system, triggering regulatory non-compliance and potential machine shutdown modes.

The DEF line is the fluid-carrying conduit that routes diesel exhaust fluid from the onboard storage tank to the dosing injector in the machine's selective catalytic reduction (SCR) aftertreatment system. The SCR system uses DEF to chemically reduce nitrogen oxide emissions from the engine exhaust, and an uninterrupted, leak-free supply of fluid is essential for that process to work correctly. When the DEF line cracks, leaks, or becomes blocked, the machine's emissions controls are compromised — typically resulting in diagnostic fault codes, reduced engine power, or a full machine lockout until the fault is resolved.

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.