Terex Detroit DD13, DD15 DEF Head Unit

Emissions Integrity for Terex Detroit: OEM DEF Head Unit (37547)

What is it?
The OEM 37547 DEF Head Unit is a factory-spec header assembly used in Terex vehicles powered by Detroit DD13 or DD15 engines. It mounts to the DEF tank and integrates sensors for fluid level and temperature, supporting proper dosing in the SCR emissions system.

Why choose this OEM DEF Head Unit?
This unit is built to Detroit and Terex engineering tolerances, ensuring accurate sensor calibration, reliable sealing, and full compatibility with the vehicle’s DEF control systems. Using the correct OEM component reduces the risk of DEF warning codes, sensor faults, leaks, or emission system disruptions that often stem from inferior aftermarket alternatives.

Key Benefits
 ✅ Direct-fit for Terex units running Detroit DD13 / DD15
 ✅ Accurate DEF fluid level and temperature monitoring
 ✅ Proper sealing prevents leaks and maintains fluid integrity
 ✅ Compatible with factory diagnostics and SCR system logic
 ✅ Remanufactured unit with one million miles / one year warranty

Applications
Intended for Terex trucks, mixers, or utility vehicles equipped with Detroit DD13 or DD15 engines. This DEF Head Unit is essential in applications like construction, heavy hauling, and vocational service where emissions compliance and DEF system reliability are critical.

Installation Notes
Installation should be handled by a qualified technician. Begin by depressurizing or isolating the DEF system. Clean the DEF tank opening and check sealing surfaces. Replace any worn O‑rings or gaskets. Install the head unit and torque it to OEM specifications. After installation, verify sensor outputs, check for fluid leaks, and clear any DEF or SCR fault codes using diagnostics.

Final Thoughts
If your Terex vehicle is showing DEF warnings or sensor errors while running a Detroit DD13 or DD15, replacing its DEF Head Unit with the OEM 37547 unit restores reliable sensor performance, proper emissions control, and system stability—all with OEM-level confidence.