Hyundai Forklifts Cummins ISB 6.7L, B6.7 DEF Head Unit

DEF Accuracy for Hyundai Forklifts – OEM DEF Head Unit (1DFQ‑70300)

What is it?
The OEM 1DFQ‑70300 DEF Head Unit is the factory header assembly designed for Hyundai forklifts powered by Cummins ISB 6.7L / B6.7 engines that use a DEF (Diesel Exhaust Fluid) system. This unit mounts on the DEF tank and houses sensors that monitor fluid level and temperature, helping to manage DEF dosing for SCR (Selective Catalytic Reduction) emission control.

Why choose this OEM DEF Head Unit?
Manufactured to Hyundai and Cummins OEM standards, this head unit ensures precise sensor calibration, proper sealing, and flawless integration with your forklift’s control system. Using the genuine part helps avoid sensor errors, leaks, erratic readings, or DEF system faults often seen with aftermarket or off‑spec replacements.

Key Benefits
 ✅ Direct-fit for Hyundai forklifts with ISB 6.7L / B6.7 in DEF-equipped setups
 ✅ Accurate monitoring of DEF fluid level and temperature
 ✅ Proper sealing to prevent leaks, contamination, and fluid loss
 ✅ Compatible with factory diagnostics and SCR control logic
 ✅ Durable design built for industrial, high-vibration environments

Applications
Used in industrial and warehouse forklifts by Hyundai that utilize Cummins ISB 6.7L / B6.7 with SCR/DEF aftertreatment. Important when servicing or replacing DEF system components to maintain emission compliance under heavy-duty conditions.

Installation Notes
A trained technician should perform the unit installation. First, depressurize or isolate the DEF system to prevent spills. Clean and inspect the mounting surface and DEF tank opening. Replace any worn O‑rings or gaskets before mounting. Install the head unit and torque the fasteners to OEM specifications. After installation, verify sensor output via diagnostics, check for leaks, and clear any DEF or SCR system fault codes to confirm normal operation.

Final Thoughts
If your Hyundai forklift with Cummins ISB 6.7L / B6.7 is encountering DEF warnings, fluid level issues, or ERR/SCR faults, replacing the head unit with the OEM 1DFQ‑70300 restores accurate monitoring and stable emissions function. Built to factory precision, it helps keep your equipment compliant and running clean.