Fire-Grade Emissions Reliability: REV ISL DEF Head Unit
What is it?
The REV Fire Group Cummins ISL DEF Head Unit is a high-precision emissions component used in fire, rescue, and emergency vehicles built on REV Group chassis with Cummins ISL engines. It accurately meters Diesel Exhaust Fluid (DEF) into the exhaust stream to effectively reduce nitrogen oxide (NOx) emissions. Integrated sensors monitor fluid level, temperature, and pressure to ensure dependable SCR system operation even under extreme duty cycles.
Why choose the REV Fire Group DEF Head Unit?
Custom-engineered for REV Group apparatus featuring Cummins ISL engines, this OEM-grade module offers plug-and-play compatibility with factory wiring harnesses and ECM calibration—no modifications needed. It prevents DEF dosing inconsistencies, SCR fault codes, and engine derates that can arise with generic parts, offering the reliability you need when minutes matter most.
Key Benefits
✅ Direct-fit solution for REV Group fire apparatus powered by Cummins ISL engines
✅ Precisely regulates DEF delivery to ensure maximum NOx reduction
✅ Continuous monitoring of fluid level, temperature, and pressure via built-in sensors
✅ Built to resist crystallization, vibration, moisture, and thermal extremes
✅ Helps prevent SCR faults, limp-mode triggers, and costly downtime
Applications
Purpose-built for REV Fire Group emergency vehicles—including pumpers, aerials, rescue units, and support rigs—equipped with Cummins ISL engines. This DEF Head Unit ensures emissions compliance and system reliability during sustained idle, rapid deployment, and high-load operations.
Installation Notes
Before servicing, power down the vehicle and depressurize the DEF system. Clean the DEF tank and lines thoroughly to remove any residue or crystallization. Mount the unit using OEM-style connectors and secure all fluid and electrical fittings generously. After installation, clear any fault codes and verify DEF dosing and sensor performance using a diagnostic scan tool.
Final Thoughts
If your REV Fire Group apparatus is experiencing DEF system errors, SCR-related derates, or dosing inconsistencies, this OEM-grade DEF Head Unit is the reliable solution. Designed for precision, durability, and emergency service readiness—it restores emissions compliance and performance when it matters most. Available now at Tamerx.