Terex Cummins ISL DEF Head Unit

Reliable DEF Control for Yard Equipment: Terex Cummins ISL DEF Head Unit (OEM 37340)

What is it?
The Terex Cummins ISL DEF Head Unit (OEM 37340) is a Diesel Exhaust Fluid (DEF) dosing control module engineered for Terex equipment equipped with the Cummins ISL engine. This component monitors and manages DEF injection—tracking fluid quality, temperature, and flow—to ensure the Selective Catalytic Reduction (SCR) system operates optimally and emissions stay within regulatory limits.

Why Choose the Terex Cummins ISL DEF Head Unit (OEM 37340)?
This head unit is manufactured to Terex’s original equipment specifications, meaning the mounting geometry, sensor ports, wiring harness interfaces, and system integration are built for a direct fit. Choosing a unit that aligns with OEM design reduces risk of fitment issues or sensor misalignment, simplifies installation, and helps maintain consistent aftertreatment system performance—especially in heavy-use yard or terminal environments.

Key Benefits
✅ Exact Fitment: Designed to match factory mounting, sensors and DEF system interfaces for efficient replacement.
✅ Industrial-Grade Durability: Constructed to withstand harsh operating conditions typical in Terex applications—vibration, high cycles, and aggressive environments.
✅ Precise DEF Dosing Control: Ensures accurate fluid delivery and sensing for the SCR system, supporting emission compliance and avoiding derates.
✅ Reduced Risk of Fault Codes: Proper unit fit and calibration help prevent DEF-system faults and unexpected downtime.
✅ System Longevity: By maintaining correct DEF management, downstream components like the SCR catalyst, sensors and exhaust hardware are less stressed and may enjoy longer service life.

Applications
The Terex Cummins ISL DEF Head Unit (OEM 37340) is tailored for yard trucks, terminal tractors, material-handling equipment and other Terex machines powered by the Cummins ISL engine that require DEF and SCR after-treatment. It’s ideally suited for operational environments where uptime, reliability and emissions performance matter.

Installation Notes
Installation is best carried out by experienced service technicians. Begin by confirming engine compatibility and that the part number 37340 matches your equipment’s serial/configuration. Before removing the existing unit, de-energize the SCR system and safely disconnect wiring and fluid lines. Remove the old head unit, paying close attention to mounting bolt locations, gasket condition and any residual DEF fluid or crystallization. Clean all mating surfaces and replace any worn gaskets or seals. Install the new unit, secure bolts to manufacturer-specified torque, reconnect sensors and wiring, then clear any fault codes in the engine control module. After installation, operate the equipment under controlled conditions, monitoring DEF dosing behavior, sensor readings and system integration to ensure correct function and leak-free service.

Final Thoughts
In heavy-use industrial equipment, proper DEF head unit operation directly influences emissions compliance and system reliability. The Terex Cummins ISL DEF Head Unit (OEM 37340) offers a factory-matched, field-proven solution designed to restore accurate fluid control, safeguard after-treatment integrity and keep your Terex-powered equipment operating at its best.