5506956RX
Doser Pump
Cummins®

The 5506956RX Doser Pump, a component manufactured by Cummins, is designed for use in commercial trucks. This article provides an overview of this part, its function, key features, benefits, and maintenance suggestions.

Basic Concepts of a Doser Pump

A doser pump is a device used in diesel exhaust systems to inject Diesel Exhaust Fluid (DEF) into the exhaust stream. This process helps reduce nitrogen oxides (NOx) emissions by facilitating the Selective Catalytic Reduction (SCR) process. The doser pump plays a role in metering and delivering DEF to the exhaust system, ensuring efficient conversion of NOx into harmless nitrogen and water vapor ¹.

Function of the 5506956RX Doser Pump

The 5506956RX is integral to the SCR system in diesel engines. It injects DEF into the exhaust stream upstream of the SCR catalyst. This injection helps in the chemical reaction that reduces NOx emissions. The pump operates based on signals from the engine control unit (ECU), which determines the required amount of DEF based on engine load, speed, and other operating conditions ².

Key Features

• High-precision dosing for accurate DEF delivery
• Durable construction to withstand high temperatures and pressures
• Compatible with Cummins engine systems
• Designed for long-term reliability and performance
• Easy to install and integrate with existing exhaust systems

Benefits

• Contributes to lower NOx emissions, helping trucks meet regulatory standards
• Enhances engine performance and efficiency
• Reduces environmental impact by minimizing harmful emissions
• Supports compliance with emissions regulations
• Prolongs the lifespan of the SCR catalyst by ensuring optimal DEF dosage ³

Troubleshooting and Maintenance

Regular maintenance of the 5506956RX Doser Pump is important to ensure its efficient operation. Key maintenance practices include:

• Checking for leaks or cracks in the pump and associated hoses
• Ensuring the DEF quality is high to prevent clogging or damage
• Monitoring the pump for any signs of malfunction, such as irregular dosing or error codes
• Following the manufacturer’s recommended service intervals for inspection and replacement
• Keeping the dosing system clean to avoid buildup that could affect performance

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, emissions solutions, and related technologies. The company is known for its commitment to innovation, quality, and customer satisfaction, providing reliable and efficient power systems for various industries.

Conclusion

The 5506956RX Doser Pump is a vital component in the SCR system of diesel engines, playing a significant role in reducing NOx emissions and enhancing engine performance. Regular maintenance and adherence to manufacturer guidelines are essential to ensure the longevity and efficiency of this Cummins part.