Wacker Neuson 5100078829 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 direct Wacker Neuson OEM part, the is manufactured to the same specifications as the original, ensuring a proper fit within the DEF delivery system. Sourced directly through authorized Wacker Neuson parts channels, this Def Line is the correct replacement when the original line shows signs of cracking, leakage, or restricted flow.

Key Features

• Genuine OEM DEF Compatibility — Engineered to handle diesel exhaust fluid without degradation, maintaining the chemical resistance required for DEF line applications.
• Direct-Fit Replacement — Matches the original routing, connection points, and line diameter of the factory-installed Def Line for a straightforward swap.
• RC110 and RC110p Series Fitment — Confirmed fit across RC110 ROPS, RC110 CAB, RC110p ROPS, and RC110p CAB models, covering both open and enclosed cab variants.
• Maintains DEF Flow Integrity — A properly functioning Def Line ensures consistent DEF delivery to the aftertreatment system, keeping the machine's emissions controls operating as intended.
• Emissions System Compliance — Correct DEF line function is essential to Tier 4 emissions compliance; a failed or leaking line can trigger fault codes, derate the engine, or prevent the machine from operating.

The Def Line is a dedicated fluid transfer line within the machine's selective catalytic reduction (SCR) system, responsible for routing diesel exhaust fluid from the DEF tank to the dosing injector. DEF must be delivered at the right rate and pressure for the SCR system to neutralize nitrogen oxide emissions effectively. When the Def Line cracks, degrades, or becomes blocked, DEF flow is interrupted — which can trigger warning codes, cause engine derate, or prevent the machine from starting until the fault is cleared.

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.