Engineered for Emergency Excellence: REV Fire Group Cummins ISL DEF Head Unit
What is it?
The REV Fire Group Cummins ISL DEF Head Unit is an emissions-critical module built specifically for emergency vehicles based on REV Group chassis powered by Cummins ISL engines. It provides precise dosing of Diesel Exhaust Fluid (DEF) into the exhaust stream to effectively reduce nitrogen oxide (NOx) emissions. Built-in sensors continuously monitor fluid level, temperature, and pressure to ensure reliable SCR system performance in high-demand operations.
Why choose the REV Fire Group DEF Head Unit?
Designed for bucket trucks, pumpers, aerials, rescue rigs, and specialty vehicles built by REV Fire Group, this DEF Head Unit integrates seamlessly with OEM wiring harnesses and ECM calibration. It eliminates the risk of DEF dosing errors, SCR fault codes, or engine derates that may occur with generic units, ensuring dependable emissions control when uptime is critical.
Key Benefits
✅ OEM-fit for REV Fire Group apparatus using Cummins ISL engines
✅ Precise DEF delivery to ensure maximum NOx reduction
✅ Built-in sensors track fluid level, temperature, and pressure in real time
✅ Engineered for durability—resistant to DEF crystallization, thermal cycling, vibration, and moisture
✅ Helps prevent SCR faults, limp-mode triggers, and unnecessary downtime
Applications
Ideal for REV Group emergency vehicles including aerials, pumpers, rescue trucks, and command units equipped with Cummins ISL diesel engines. Tailored for rapid deployment and high-idle performance during emergency response.
Installation Notes
Before replacing the unit, disconnect system power and depressurize the DEF lines. Clean the DEF tank and fluid ports thoroughly to eliminate residue. Install the new head unit using OEM connector fittings and secure fluid and electrical lines. Once installed, clear any system codes and verify DEF dosing and sensor readings using a diagnostic scan tool.
Final Thoughts
When DEF dosing issues or SCR-related alert codes threaten your emergency vehicle’s reliability, the REV Fire Group Cummins ISL DEF Head Unit is the reliable OEM solution you need. Built for precision, durability, and mission-critical readiness—available now at Tamerx.