Diesel emission systems are no longer optional extras—they’re mission-critical. One pivotal component in that chain is the DEF (Diesel Exhaust Fluid) head, especially in Cummins ISB 6.7L engines. For trucks and equipment in Lodal applications, the Lodal Cummins ISB 6.7L DEF Head Unit (OEM 3600821, Tamerx part 5410-18-FA01-4) stands as the backbone of accurate dosing and emissions compliance. A malfunctioning DEF head can trigger system faults, error codes, or even engine derates—which nobody wants in the middle of a route.
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Manages precise dosing of DEF into the exhaust to enable proper NOx reduction in your SCR system
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Monitors DEF fluid level, temperature, and urea concentration, supplying data to your engine control module
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OEM 3600821 ensures direct compatibility with Cummins ISB 6.7L in Lodal systems
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Helps prevent warnings, system faults, and engine derates when defective or degraded heads fail to relay proper readings
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Built for durability—resisting vibration, corrosion, and thermal stress common in commercial operations
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Designed for relatively simple replacement, minimizing downtime
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Backed by Tamerx’s one million mile / one year warranty when installed properly
Don’t let a weak or failing DEF head jeopardize your emissions system integrity. Installing the OEM 3600821 Lodal Cummins ISB 6.7L DEF Head Unit restores accurate monitoring, safeguards against system errors, and helps your vehicle stay clean on emissions. Ensure your fleet—or your truck—stays compliant and dependable with this essential component.




















































































































































































































































































