Cummins QSB DEF Doser Injector 2018-2021: OEM 5506856

Precise Emissions Control with the Cummins QSB DEF Doser Injector – OEM 5506856

What is it?
The Cummins DEF Doser Injector (OEM 5506856) is an original equipment part that delivers Diesel Exhaust Fluid (DEF) into the exhaust stream to support proper operation of the SCR (Selective Catalytic Reduction) system. This process helps reduce nitrogen oxide (NOx) emissions and ensures compliance with environmental standards.

Why Choose OEM 5506856?
OEM 5506856 is engineered specifically for Cummins QSB engines from 2018 to 2021. With factory-level calibration and construction, it guarantees accurate dosing, dependable operation, and full compatibility with your engine’s emission control system.

Key Benefits
✅ Direct-fit for Cummins QSB engines from 2018–2021—no modifications required.
✅ Delivers precise DEF injection to support effective NOx reduction.
✅ Built to resist high heat and exhaust system contaminants.
✅ Meets Cummins OEM quality standards for consistency and durability.
✅ Installs easily using factory mounting and connectors.

Applications
This DEF doser injector is designed for Cummins QSB engines in construction, industrial, and off-highway equipment manufactured between 2018 and 2021. It plays a key role in the engine’s aftertreatment system, helping operators meet emissions regulations while maintaining engine efficiency.

Installation Notes
Installation is straightforward and typically involves removing the old injector from the exhaust system and replacing it with the new unit. Always allow the exhaust system to cool and disconnect the battery before beginning work. Inspect the DEF lines and mounting hardware to ensure a secure and leak-free connection.

Final Thoughts
The Cummins OEM 5506856 DEF Doser Injector is a crucial part of your engine’s emissions system. When it comes to maintaining compliance and ensuring smooth SCR function, this OEM injector provides the reliability and precision your QSB engine demands.