When running heavy equipment powered by Cummins motors, every link in the emissions aftertreatment chain must hold up under pressure. One part that often slips under the radar until trouble strikes is the DEF (Diesel Exhaust Fluid) head unit. The Doosan Bobcat Cummins DEF Head Unit (OEM 46854881, Tamerx part 4310-22-2) handles critical sensing and control tasks—and when it fails, your SCR system, diagnostics, and downtime are all at risk.
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Monitors DEF fluid level, temperature, and urea concentration, transmitting precise data to the machine’s ECU
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Regulates accurate dosing of DEF into the exhaust stream to support the SCR system in reducing NOx
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Manufactured to OEM 46854881 standards, ensuring proper fitment and calibration
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Helps prevent system fault codes, warning lights, and engine derates caused by sensor drift or failure
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Built to withstand the harsh conditions common in off-road use: vibration, temperature extremes, and corrosive DEF chemistry
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Designed for easier replacement to limit machine downtime
Operating heavy machinery already pushes components to the limits. Don’t let a failing DEF head become your weak link. Installing a proper OEM-matched unit restores system accuracy, prevents surprise failures, and keeps your emissions system working consistently—even in demanding environments. Prioritize it in your maintenance schedule and keep your machines running clean and dependable.