3684361
Doser Shutoff Assembly
Cummins®

The Cummins Doser Shutoff Assembly (part number 3684361) is a critical component in the emissions control system of commercial trucks. Manufactured by Cummins, a leader in diesel engine and emissions technology, this part enhances the efficiency and environmental compliance of trucks by regulating the injection of diesel exhaust fluid (DEF) within the Selective Catalytic Reduction (SCR) system ¹.

Function and Operation

The Doser Shutoff Assembly operates by controlling the flow of DEF into the exhaust stream, a process integral to the SCR system’s function of converting nitrogen oxides (NOx) into nitrogen and water ². Its operation is synchronized with the engine’s performance and exhaust conditions to optimize DEF usage and emissions reduction.

Key Features

This Cummins part is characterized by its durable design, which withstands the harsh conditions of the exhaust system, and its precise control over DEF injection, ensuring the SCR system operates within optimal parameters ³. It also features advanced sealing mechanisms to prevent leaks and maintain the integrity of the DEF delivery system.

Benefits of Using the Doser Shutoff Assembly

Utilizing this part offers advantages such as improved emissions control, enhanced engine performance, and compliance with environmental regulations ⁴. It ensures the SCR system receives the correct amount of DEF for effective NOx reduction, contributing to the truck’s efficiency and longevity.

Installation and Integration

Proper installation of the Doser Shutoff Assembly is crucial for its effective operation. It is designed for compatibility with various truck models, ensuring seamless integration into the emissions control system. Following manufacturer specifications for installation is recommended to ensure correct placement and connection within the system.

Maintenance and Troubleshooting

Routine maintenance of the Doser Shutoff Assembly is essential for its longevity and optimal performance. This includes regular inspections for wear or damage, ensuring secure connections, and verifying the DEF delivery system’s functionality. Troubleshooting common issues such as DEF leaks or injection control malfunctions involves checking the assembly’s installation, inspecting seals and connections, and ensuring the DEF supply system is operational.

Regulatory Compliance

The Doser Shutoff Assembly plays a role in helping trucks meet emissions standards set by regulatory bodies. Compliance with these standards is crucial in the commercial trucking industry to reduce environmental impact and avoid penalties. This part ensures the SCR system operates within the parameters required by regulations, supporting environmental goals and legal operation.

Cummins: A Brief Overview

Cummins Inc. is a leader in diesel engine and emissions control technology, with a history of innovation and commitment to quality. The company’s focus on research and development has led to advancements in emissions control technologies, including the Doser Shutoff Assembly. Cummins’ dedication to sustainability and environmental responsibility is evident in its product offerings and technological innovations.

Compatibility with Cummins Engines

The Doser Shutoff Assembly (part 3684361) is compatible with various Cummins engines, including ISB, ISM CM876, ISX CM871, QSX11.9 CM2250 ECF, QSX15 CM2250, and QSX15 CM2350 X105 engines. This part is engineered to ensure precise control over the exhaust gas recirculation (EGR) process, vital for maintaining optimal engine performance and emissions compliance.

Role in Engine Systems

The Doser Shutoff Assembly is integral to the orchestration of fluid dosing and fuel management within engine systems. It works in tandem with the Fluid Doser and the Fuel Shutoff Valve to ensure precise control over the dosing process and the secure shutoff of fuel when necessary. This integration enhances the efficiency of the SCR system and contributes to the engine’s overall efficiency, safety, and environmental compliance.

Conclusion

The Cummins Doser Shutoff Assembly (3684361) is a vital component in the emissions control system of commercial trucks. Its precise operation ensures efficient DEF injection, contributing to reduced emissions, enhanced engine performance, and regulatory compliance. Proper installation, maintenance, and understanding of its role in engine systems are essential for maximizing its benefits.