5273337NX
Doser Pump
Cummins®

The Doser Pump (Part Number: 5273337NX) is a component commonly found in commercial trucks, specifically those manufactured by Cummins®. It plays a crucial role in the selective catalytic reduction (SCR) system, which helps control the truck's emissions. The Doser Pump is responsible for injecting a precise amount of diesel exhaust fluid (DEF) into the exhaust stream of the engine. This fluid, composed of urea and purified water, reacts with the harmful nitrogen oxides (NOx) produced during combustion. Through a chemical reaction, the DEF transforms the NOx into harmless nitrogen gas and water vapor, significantly reducing the emissions released into the environment. By accurately metering and delivering the DEF, the Doser Pump ensures that the correct amount of fluid is introduced into the exhaust system to optimize the SCR process. This helps the truck comply with emission standards and regulations while reducing its impact on air quality. In summary, the Doser Pump in a Cummins® commercial truck is a critical component of the SCR system, precisely injecting diesel exhaust fluid to facilitate the conversion of harmful emissions into less harmful substances.