For heavy equipment operators running Liugong machinery powered by the Cummins ISB 6.7L engine, emission system reliability is non-negotiable. The DEF (Diesel Exhaust Fluid) head unit may be small in size, but it plays a pivotal role in the performance, diagnostics, and compliance of your aftertreatment system. The Liugong Cummins ISB 6.7L DEF Head Unit (OEM SP222118, Tamerx part 4310-18-9) ensures your SCR system receives accurate data on fluid levels and quality—without it, warning lights, derates, or faults may follow.
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Monitors DEF fluid level, temperature, and urea concentration, sending real-time data to the engine control module
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Regulates precise dosing of urea into the exhaust stream to allow the SCR (Selective Catalytic Reduction) system to reduce NOx emissions effectively
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Built to OEM SP222118 specs for plug-and-play compatibility with Liugong / Cummins ISB 6.7L systems
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Includes a 40-micron filter to protect downstream injectors and valves from contamination
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Helps prevent emissions warning codes, system faults, and engine derates caused by sensor drift or inaccurate readings
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Designed to endure real-world stress: vibration, temperature cycling, and exposure to DEF chemistry
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Easier field replacement helps reduce downtime when swaps are needed
A failing DEF head doesn’t always announce itself—often the first signs are a check engine light or SCR warnings. But by then, the integrity of your emissions system is already compromised. Installing the OEM SP222118 Liugong Cummins ISB 6.7L DEF Head Unit restores accurate sensing, keeps your SCR system operating properly, and protects your operation from surprise maintenance failures. In the world of emissions control, accuracy isn’t optional—it’s essential.