CAT Caterpillar C3.6 DEF Head Unit

Emissions Reliability for CAT C3.6: OEM DEF Head Unit (5913428)

What is it?
The OEM 5913428 DEF Head Unit is a factory-designed header assembly for Caterpillar C3.6 engines equipped with SCR (Selective Catalytic Reduction) systems. Mounted on the DEF (Diesel Exhaust Fluid) tank, it houses sensors that monitor fluid level, temperature, and integrate with the engine’s emissions control ECU to maintain accurate dosing and SCR performance.

Why choose this OEM DEF Head Unit?
This unit is manufactured to CAT’s strict specifications, ensuring proper sensor calibration, sealing integrity, and compatibility with existing DEF plumbing and control systems. Choosing the genuine part helps avoid DEF system faults, improper readings, or leaks that often occur with generic replacements.

Key Benefits
 ✅ Direct-fit for CAT C3.6 SCR systems
 ✅ Accurate monitoring of DEF fluid level and temperature
 ✅ Proper sealing to prevent leaks and DEF contamination
 ✅ Maintains diagnostic and emissions system integrity
 ✅ Designed for durability under heat, vibration, and operating stresses

Applications
Ideal for light- to medium-duty equipment and machinery powered by the CAT C3.6 engine that employs DEF emission control. Used in agricultural, construction, and industrial machines where emission compliance and DEF system reliability are essential.

Installation Notes
Professional installation is recommended. Depressurize or isolate the DEF system before working. Clean the tank mounting area and inspect for seal damage. Replace O‑rings or gaskets as needed and torque fasteners to OEM specifications. After installation, verify sensor outputs and clear any DEF-related fault codes via diagnostics.

Final Thoughts
If your CAT C3.6 engine is showing DEF-related errors, fluid-level inconsistencies, or you’re servicing the DEF system, the OEM 5913428 DEF Head Unit restores sensor accuracy and emissions functionality. With factory-level performance and fit, it’s a reliable solution for maintaining clean operation and system dependability.