REV Group Cummins ISL

Factory-Fit DEF Head Unit for REV Group ISL Chassis Vehicles

What Is It?

The OEM 721463 DEF head unit is a direct-fit emissions component designed for REV Group fire apparatus built on Cummins ISL-powered chassis. It combines level sensing, temperature monitoring, suction, and heating controls for accurate Diesel Exhaust Fluid (DEF) management in the SCR system.

Why Choose OEM 721463?

This head unit is manufactured to Cummins and REV Group standards, ensuring proper integration with chassis wiring, DEF tanks, and ECM logic. It supports correct dosing, prevents system errors, and helps avoid DEF-related shutdowns due to misreading or contamination.

Key Benefits

✅ Designed for REV Group chassis with Cummins ISL engines
✅ Monitors DEF level, temperature, and suction flow
✅ Plug-and-play compatibility with factory wiring and ECM logic
✅ Heated for cold climates—prevents DEF freezing
✅ Reliable under demanding fleet-use conditions

Applications

This head unit is used in fire trucks and emergency vehicles built by REV Group on Cummins ISL platforms. It’s ideal for applications where uninterrupted emissions compliance and DEF system reliability are critical.

Installation Notes

Professional installation is recommended. Inspect DEF tank fittings and electrical connectors before installation. After mounting the unit, run a diagnostic system check, clear any active codes, and verify correct fluid level and temperature reporting via the ECM.

Final Thoughts

The OEM 721463 DEF head unit delivers precise emissions monitoring and system stability in SCR-equipped REV Group vehicles. With factory-matched reliability and seamless integration, it’s engineered to keep your apparatus operating cleanly and reliably under mission-critical conditions.