5375479
Doser Pump
Cummins®

Introduction

The Cummins 5375479 Doser Pump is a component designed for use in commercial trucks, specifically within their engine systems. Its purpose is to facilitate the injection of Diesel Exhaust Fluid (DEF) into the exhaust stream, which is a key process in reducing harmful emissions. The significance of this pump lies in its contribution to meeting stringent emissions regulations, thereby ensuring that commercial trucks operate in an environmentally responsible manner ¹.

Basic Concepts of Doser Pumps

A doser pump is a device that precisely injects DEF into the exhaust stream of a diesel engine. This injection occurs upstream of the Selective Catalytic Reduction (SCR) catalyst. The doser pump’s function is integral to the SCR system, which converts nitrogen oxides (NOx) into nitrogen (N2) and water (H2O), significantly reducing the engine’s emissions. The doser pump operates by receiving a signal from the engine’s Electronic Control Module (ECM), which determines the amount of DEF needed based on engine load, speed, and other operating conditions ².

Purpose of the Cummins 5375479 Doser Pump

The Cummins 5375479 Doser Pump plays a specific role in the operation of a truck by facilitating the DEF injection process within the SCR system. This pump ensures that the correct amount of DEF is delivered to the exhaust stream, optimizing the chemical reaction that reduces NOx emissions. Its function is vital for the SCR system’s effectiveness, directly influencing the truck’s compliance with emissions standards ³.

Key Features

The Cummins 5375479 Doser Pump is characterized by several key features that enhance its performance and reliability. Its design incorporates advanced materials that resist corrosion and wear, ensuring durability in the harsh environment of a diesel exhaust system. Technological advancements within the pump include precise control mechanisms that allow for accurate DEF dosing, even under varying engine conditions. Additionally, the pump’s construction is optimized for easy installation and maintenance, contributing to its overall effectiveness.

Benefits of Using the Cummins 5375479 Doser Pump

Utilizing the Cummins 5375479 Doser Pump offers several advantages. It contributes to improved emissions control by ensuring efficient DEF delivery, which is crucial for the SCR system’s operation. This, in turn, helps trucks meet regulatory emissions standards. Furthermore, the pump’s precise dosing capabilities can enhance engine performance by maintaining optimal SCR system efficiency. Additionally, by reducing emissions, the pump indirectly supports increased fuel efficiency, as the engine operates more cleanly and efficiently.

Installation and Integration

Proper installation and integration of the Cummins 5375479 Doser Pump within a truck’s engine system require careful consideration of several factors. It is important to ensure that the pump is correctly positioned to allow for effective DEF delivery to the exhaust stream. This may involve aligning the pump with the exhaust system’s geometry and ensuring that all connections are secure and leak-free. Additionally, the pump must be electrically connected to the engine’s ECM to receive dosing commands. Following manufacturer guidelines for installation is crucial to ensure the pump’s optimal performance and longevity.

Troubleshooting and Maintenance

Effective troubleshooting and maintenance practices are key to ensuring the Cummins 5375479 Doser Pump’s optimal performance and longevity. Common issues may include dosing inaccuracies, which can be addressed by checking the pump’s electrical connections and ensuring the DEF supply is unobstructed. Regular maintenance should include inspecting the pump for signs of wear or corrosion, verifying the integrity of its connections, and ensuring that the DEF supply system is functioning correctly. Adhering to recommended maintenance schedules can help prevent issues and ensure the pump’s continued reliable operation.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a reputation for innovation, quality, and reliability in the automotive and heavy-duty truck industries. The company’s commitment to advancing technology and sustainability is evident in its product offerings, including the Cummins 5375479 Doser Pump, which exemplifies Cummins’ dedication to enhancing engine performance while reducing environmental impact.

Role of Part 5375479 Doser Pump in Engine Systems

The part 5375479 doser pump is an integral component in modern engine systems, specifically within the selective catalytic reduction (SCR) system. Its primary function is to inject a precise amount of diesel exhaust fluid (DEF) into the exhaust stream. This injection occurs upstream of the SCR catalyst, where the DEF reacts with nitrogen oxides (NOx) to convert them into harmless nitrogen and water vapor.

Interaction with Key Components

1. Exhaust Gas Recirculation (EGR) System: The doser pump works in conjunction with the EGR system to reduce NOx emissions. By injecting DEF into the exhaust stream, the doser pump enhances the efficiency of the EGR system, ensuring that emissions remain within regulatory limits.

2. SCR Catalyst: The doser pump’s role is to provide the necessary DEF for the SCR catalyst to function effectively. The catalyst relies on the consistent and accurate dosing of DEF to facilitate the chemical reaction that neutralizes NOx.

3. Engine Control Unit (ECU): The doser pump is controlled by the ECU, which monitors various parameters such as engine load, exhaust temperature, and NOx levels. The ECU sends signals to the doser pump to adjust the DEF injection rate in real-time, ensuring optimal performance and emission control.

4. DEF Tank and Pump: The doser pump is part of a larger DEF delivery system that includes the DEF tank and a high-pressure pump. The high-pressure pump delivers DEF from the tank to the doser pump, which then meters and injects it into the exhaust stream.

5. NOx Sensor: Located downstream of the SCR catalyst, the NOx sensor provides feedback to the ECU regarding the effectiveness of the DEF injection. This feedback loop allows the ECU to make necessary adjustments to the doser pump’s operation, ensuring that emissions are consistently controlled.

6. Aftertreatment System: The doser pump is a key component within the broader aftertreatment system, which includes the diesel particulate filter (DPF), the DOC (diesel oxidation catalyst), and the SCR system. Each of these components works together to clean the exhaust gases before they are released into the atmosphere.

Conclusion

In summary, the Cummins 5375479 Doser Pump plays a significant role in the efficient operation of the SCR system, working in harmony with other engine components to ensure compliance with emission regulations and maintain engine performance. Its precise dosing capabilities, durability, and integration with the engine’s control systems make it a critical component in modern diesel engine technology.