Perkins Engines Perkins DEF Head Unit

Emissions Assurance for Perkins Engines – OEM DEF Head Unit (T434680)

What is it?
The OEM T434680 DEF Head Unit is a factory-level header assembly designed for Perkins engines employing SCR (Selective Catalytic Reduction) systems. It sits atop the DEF (Diesel Exhaust Fluid) tank and houses sensors that monitor fluid level, temperature, and other parameters needed for accurate DEF dosing and emissions control.

Why choose this OEM DEF Head Unit?
Manufactured to Perkins’ design specifications, this unit ensures proper sensor calibration, sealing, and compatibility with the existing DEF system infrastructure. A genuine unit helps avoid sensor errors, improper readings, fluid leaks, or system faults that can arise with aftermarket or off‑spec alternatives.

Key Benefits
 ✅ Direct OEM fit for Perkins SCR‑equipped engines
 ✅ Precise monitoring of DEF fluid level and temperature
 ✅ Proper sealing to prevent leaks and contamination
 ✅ Maintains diagnostic and emissions system integrity
 ✅ Built for durability under thermal, vibrational, and operational stresses

Applications
Suitable for a wide range of Perkins-powered equipment and machinery that incorporate DEF/SCR aftertreatment systems. Common in industrial, construction, agricultural, and generator applications where emissions control is required.

Installation Notes
Have installation performed by qualified technicians. Depressurize or isolate the DEF system before beginning. Clean surfaces and inspect the DEF tank opening. Replace any gaskets or O‑rings. Mount the head unit to OEM torque specifications. After installation, verify sensor readings and clear any DEF-related fault codes via diagnostic tools.

Final Thoughts
If your Perkins-equipped machine is experiencing DEF sensor issues, warning signals, or erratic DEF behavior, replacing the unit with the OEM T434680 DEF Head Unit restores reliable sensor functionality, proper emissions control, and system integrity. Trust the genuine part to help your equipment maintain compliance and dependable operation.