4377546
Diesel Exhaust Fluid Tank
Cummins®

Introduction

The Cummins 4377546 Diesel Exhaust Fluid Tank is a component designed for use in heavy-duty trucks. Its primary function is to store Diesel Exhaust Fluid (DEF), which is integral to the operation of the Selective Catalytic Reduction (SCR) system. This system plays a role in reducing nitrogen oxide (NOx) emissions, contributing to cleaner air and compliance with environmental regulations ¹.

Basic Concepts of Diesel Exhaust Fluid Tanks

A Diesel Exhaust Fluid (DEF) tank is a reservoir that holds DEF, a solution of urea and deionized water. Within the SCR system, DEF is injected into the exhaust stream where it decomposes into ammonia and carbon dioxide. The ammonia then reacts with NOx in the presence of a catalyst, converting it into nitrogen and water vapor. This process significantly reduces harmful emissions ². The DEF tank’s role is to provide a consistent supply of DEF to the SCR system, ensuring effective emission control.

Purpose and Role in Truck Operation

This Cummins part contributes to the overall operation of a truck by ensuring the SCR system has a reliable source of DEF. This interaction is vital for the SCR system to function correctly, reducing NOx emissions as the truck operates. By maintaining DEF levels, the tank supports the truck’s emission control efforts, helping it meet regulatory standards and operate more cleanly.

Key Features

The Diesel Exhaust Fluid Tank is constructed from materials that resist corrosion and withstand the chemical properties of DEF. Its design includes a sufficient capacity to accommodate the DEF needs of heavy-duty applications, ensuring prolonged operation between refills. Additionally, the tank incorporates design elements that enhance its durability and functionality, such as robust mounting points and a secure DEF delivery system.

Benefits

The 4377546 offers several benefits, including improved emission control through its integration with the SCR system. It aids in compliance with environmental regulations by ensuring the SCR system has the DEF it needs to operate effectively. Furthermore, by contributing to lower emissions, it may also support increases in engine efficiency and performance, as cleaner operations can lead to smoother engine performance.

Installation Considerations

When installing this part, it is important to consider compatibility with the truck model and the existing emission control systems. Proper installation ensures the tank integrates seamlessly with the SCR system, maintaining the efficiency of emission control. Following manufacturer guidelines for installation helps ensure the tank operates as intended, contributing to the truck’s overall performance and emission standards compliance.

Maintenance and Troubleshooting

Routine maintenance of the Diesel Exhaust Fluid Tank includes checking for DEF level, inspecting for leaks, and ensuring the DEF delivery system is free from contamination. Addressing common issues such as leaks, contamination, and sensor malfunctions promptly helps maintain the tank’s efficiency and longevity. Regular inspections and adherence to maintenance schedules are recommended to prevent issues and ensure the SCR system operates effectively.

Environmental Impact

The use of the Cummins 4377546 Diesel Exhaust Fluid Tank contributes to a reduced environmental impact by enabling the SCR system to lower NOx emissions. This reduction in emissions supports compliance with regulatory standards and promotes cleaner air quality. The tank’s role in the emission control process is a key component in the efforts to minimize the environmental footprint of heavy-duty trucks.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions. With a history of innovation in diesel engine technology and emission control, Cummins is committed to developing products that meet the evolving needs of its customers while also addressing environmental concerns. The company’s product range includes engines, filtration systems, and emission control technologies, all designed to deliver reliable performance and efficiency.

Compatibility

This DEF tank is compatible with the following Cummins engines:

• F3.8 CM2350
• F128C
• QSB6.7 CM2350 B105
• QSF3.8 CM2350 F107
• QSG12/X12 CM2350 G110
• QSL9 CM2350 L102
• QSX15 CM2350 X105

Ensuring compatibility with these engines, the Cummins DEF Tank 4377546 plays a vital role in maintaining the efficiency and reliability of the SCR system, ultimately contributing to the overall performance and longevity of the engine.

Role in Engine Systems

The Diesel Exhaust Fluid (DEF) tank, identified by part number 4377546, is an integral component in modern diesel engine systems, specifically those equipped with Selective Catalytic Reduction (SCR) technology. This tank stores DEF, a solution of urea and deionized water, which is essential for reducing nitrogen oxides (NOx) emissions from diesel exhaust.

When the engine is running, the DEF is injected into the exhaust stream upstream of the SCR catalyst. Here, the DEF decomposes into ammonia and carbon dioxide. The ammonia then reacts with NOx in the presence of the SCR catalyst, converting them into harmless nitrogen and water vapor.

The DEF tank is connected to the DEF dosing system, which includes the DEF pump, injector, and associated tubing. The tank must maintain a consistent level of DEF to ensure the dosing system can operate effectively. A level sensor within the tank monitors the DEF level and sends signals to the engine control unit (ECU). The ECU uses this information to alert the driver when the DEF needs to be refilled.

In addition to the dosing system, the DEF tank interacts with the vehicle’s overall emissions control strategy. The ECU coordinates the DEF injection with other parameters such as engine load, speed, and exhaust temperature to optimize the reduction of NOx emissions.

Furthermore, the DEF tank is designed to withstand the thermal and chemical stresses associated with diesel exhaust systems. It is typically made from materials resistant to corrosion and degradation from DEF and exhaust gases.

In summary, the DEF tank plays a significant role in ensuring that diesel engines meet stringent emissions regulations while maintaining performance and efficiency.

Conclusion

The Cummins 4377546 Diesel Exhaust Fluid Tank is a critical component in the emission control system of heavy-duty trucks. By storing and delivering DEF to the SCR system, it ensures the reduction of NOx emissions, contributing to environmental compliance and cleaner air quality. Its design, compatibility with various Cummins engines, and integration within the engine’s emission control strategy highlight its importance in modern diesel engine technology.