In terminal operations and heavy lifting environments, Kalmar Ottawa machines rely on clean, consistent performance from their emissions systems. A central yet often overlooked component is the DEF (Diesel Exhaust Fluid) head unit. For Cummins ISL configurations, the OEM 90035845 DEF Head Unit (Tamerx part 4310-11-8) ensures your aftertreatment circuitry keeps correct readings and dosing. When that module is out of spec or failing, your SCR (Selective Catalytic Reduction) system’s reliability—and your vehicle’s uptime—are at risk.
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Monitors DEF fluid level, temperature, and urea concentration, sending accurate feedback to the engine control module
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Regulates precise dosing of DEF into the exhaust stream so NOx reduction is efficient and effective
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Engineered to match OEM tolerances for drop-in compatibility with Kalmar Ottawa / Cummins ISL setups
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Helps prevent fault codes, warning lights, and engine derates caused by incorrect sensor signals
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Includes internal filtration (about 40 microns) to guard against contamination in the DEF plumbing
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Built to sustain vibration, temperature swings, and exposure to DEF’s chemical stresses
A faulty or drifting DEF head often quietly undermines your emission system—until a warning light or derate catches you by surprise. Installing the correct OEM 90035845 Kalmar Ottawa DEF Head Unit restores the precision of your SCR feedback loop, stabilizes emissions control, and helps ensure your equipment stays in service, not sidelined. Even the smallest component in the chain deserves your attention—it’s often the difference between reliability and disruption.