If your Bobcat D34 is equipped with SCR aftertreatment, the DEF (Diesel Exhaust Fluid) head unit is one of those unsung heroes. The Bobcat D34 DEF Head Unit, OEM 7381451 (Tamerx part 4310-11-1) monitors fluid parameters, regulates dosing, and ensures your emissions system stays in check. When it malfunctions or drifts out of calibration, you could see warning codes, reduced performance, or even system shutdowns.
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Monitors DEF fluid level, temperature, and urea concentration, delivering accurate feedback to the engine’s ECU
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Controls precise dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can reduce NOx emissions properly
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Equipped with a 40-micron filter to protect injectors from contamination
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Built to match OEM 7381451 tolerances for compatibility and calibration integrity
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Helps avoid error codes, emissions warnings, and engine derates rooted in incorrect or drifting sensor signals
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Constructed to endure harsh operating conditions—vibration, heat cycle stress, and exposure to DEF chemistry
Because it’s often overlooked, the DEF head unit is a common point of failure in emissions systems. Replacing it with the correct unit—OEM 7381451 Tamerx 4310-11-1—restores your system’s sensor fidelity, safeguards your SCR’s function, and helps keep your Bobcat D34 running clean, compliant, and dependable. Don’t let a small sensor become your emissions bottleneck.