5506956
Doser Pump
Cummins®

The Cummins 5506956 Doser Pump is a critical component in commercial trucks, designed to inject Diesel Exhaust Fluid (DEF) into the exhaust stream. This action is part of the emissions control system, aimed at reducing nitrogen oxides (NOx) emissions to meet stringent regulations. The pump’s role in modern diesel engines is indispensable for ensuring compliance with emissions standards.

Basic Concepts of Doser Pumps

A doser pump, such as the Cummins 5506956, is integral to the Selective Catalytic Reduction (SCR) system in diesel engines. This system converts NOx into nitrogen and water vapor through the precise injection of DEF into the exhaust stream. The doser pump’s function is to meter and inject DEF at specific points in the exhaust system, facilitating the chemical reaction that reduces NOx emissions ¹.

Functionality of the 5506956 Doser Pump

This Cummins part operates within the truck’s emissions control system by injecting DEF into the exhaust stream downstream of the engine. The precise delivery of DEF is crucial for the SCR system’s efficiency and for maintaining optimal engine performance. The pump ensures the right amount of DEF is used to effectively reduce NOx emissions without waste ².

Key Features

The 5506956 Doser Pump is distinguished by its advanced technology for accurate DEF delivery, robust construction, and integration with the vehicle’s electronic control system. These features enhance its performance and durability, ensuring it can withstand the harsh conditions of the exhaust system ³.

Benefits

This part offers several benefits, including improved emissions compliance, enhanced engine performance, and a contribution to environmental sustainability by reducing harmful emissions. The SCR system, supported by the doser pump, allows the engine to operate more efficiently, contributing to cleaner air quality.

Troubleshooting and Maintenance

Common issues with doser pumps include clogging, leaks, and electrical failures. Troubleshooting involves checking DEF quality, ensuring the pump and lines are free from obstructions, and verifying electrical connections. Regular maintenance, such as inspecting for wear or damage, flushing the system, and ensuring the DEF reservoir is filled with high-quality fluid, is crucial for the pump’s optimal performance and longevity.

Cummins Overview

Cummins Inc. is a global leader in diesel and natural gas engines and related technologies. With over a century of history, Cummins is renowned for its commitment to innovation and quality, evident in its wide range of products, including the 5506956 Doser Pump, designed to meet the evolving needs of the commercial vehicle industry.

Compatibility of the 5506956 Doser Pump with Cummins Engines

The 5506956 Doser Pump is designed for compatibility with various Cummins engines, ensuring precise dosing of DEF. It is specifically engineered for models like the QSG12/X12 CM2350 G110, X15 CM2350 Series (including X15 CM2350 X116B and X15 CM2350 X123B), and the X15 CM2450 X134B, facilitating seamless integration and reliable performance.

Role of the 5506956 Doser Pump in Aftertreatment Systems

The 5506956 Doser Pump is crucial in the aftertreatment systems of modern engines, enhancing emissions control efficiency. It delivers DEF into the exhaust stream for the SCR system, converting NOx into nitrogen and water. The pump’s precise injection is essential for the SCR catalyst’s optimal operation and the aftertreatment system’s durability.

Conclusion

The Cummins 5506956 Doser Pump is a vital component in modern diesel engines, ensuring compliance with emissions regulations through the precise delivery of DEF. Its advanced features, compatibility with various Cummins engines, and role in aftertreatment systems underscore its importance in achieving lower emissions and maintaining engine performance.