5418806
Doser Pump
Cummins®

The Cummins 5418806 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. This part is significant in the operation of commercial trucks as it helps ensure compliance with stringent environmental regulations while also contributing to the overall efficiency of the engine 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 role of the doser pump in the engine system is to enable the chemical reaction that converts nitrogen oxides (NOx) into nitrogen and water vapor, thereby reducing emissions. This process is a fundamental aspect of modern emissions control technologies in diesel engines ².

Purpose of the 5418806 Doser Pump

The Cummins 5418806 Doser Pump is integral to the SCR system in commercial trucks. It functions by delivering DEF into the exhaust stream at calculated intervals and quantities. This precise dosing allows for the effective reduction of NOx emissions, ensuring that the truck meets environmental standards. The pump’s operation is controlled by the engine’s electronic control unit (ECU), which monitors various parameters to determine the optimal timing and amount of DEF to be injected ³.

Key Features

The Cummins 5418806 Doser Pump is characterized by several key features that enhance its performance and reliability. Its design incorporates advanced technology to ensure accurate dosing of DEF. The pump is constructed from durable materials to withstand the harsh conditions within the exhaust system. Additionally, it features a compact design that allows for easy integration into various truck models ⁴.

Benefits of Using the 5418806 Doser Pump

Utilizing the Cummins 5418806 Doser Pump offers several advantages. It contributes to improved emissions performance by effectively reducing NOx levels. This not only helps in complying with environmental regulations but also enhances the overall efficiency of the engine. The pump’s reliable operation ensures consistent performance, minimizing the risk of emissions-related issues ⁵.

Installation Process

Installing the Cummins 5418806 Doser Pump requires careful attention to detail. The process involves preparing the exhaust system for the pump’s integration, ensuring all connections are secure, and verifying that the pump is correctly aligned with the SCR system. Proper tools and equipment are necessary to facilitate a smooth installation. Following the manufacturer’s guidelines ensures that the pump is installed correctly and functions as intended ⁶.

Troubleshooting Common Issues

Common issues with the Cummins 5418806 Doser Pump may include dosing inaccuracies, leaks, or electrical faults. Troubleshooting these problems involves checking the pump’s connections, inspecting for damage, and verifying the electrical supply. Solutions may range from simple adjustments to more complex repairs, depending on the nature of the issue. Regular monitoring and maintenance can help prevent many common problems ⁷.

Maintenance Tips

To ensure the optimal performance and longevity of the Cummins 5418806 Doser Pump, regular maintenance is recommended. This includes inspecting the pump and its connections for signs of wear or damage, ensuring the DEF quality is high, and following the manufacturer’s maintenance schedule. Proper maintenance practices help maintain the efficiency of the SCR system and ensure consistent emissions performance ⁸.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions technologies. With a history of innovation and a commitment to sustainability, Cummins plays a significant role in the automotive industry. The company’s product offerings are designed to meet the evolving needs of customers while also addressing environmental challenges ⁹.

Compatibility with Cummins Engines

The Doser Pump part number 5418806, manufactured by Cummins, is designed to integrate seamlessly with a variety of Cummins engine models. This part is crucial for the precise dosing of fuel or other fluids, ensuring optimal engine performance and efficiency.

D4.0 CM2620 D103B

The D4.0 CM2620 D103B engine benefits from the Doser Pump 5418806, which ensures accurate fuel delivery. This engine model is known for its reliability and efficiency, and the doser pump enhances these attributes by providing a consistent and controlled fuel supply.

F3.8 CM2350 F128C and QSF3.8 CM2350 F107

Both the F3.8 CM2350 F128C and QSF3.8 CM2350 F107 engines are compatible with the Doser Pump 5418806. This part is essential for maintaining the precise fuel dosing required by these engines, ensuring they operate at peak performance levels. The doser pump’s role in these models is to maintain the delicate balance of fuel delivery, which is critical for the engines’ efficiency and longevity.

F3.8 CM2620 F137B

The F3.8 CM2620 F137B engine also integrates well with the Doser Pump 5418806. This engine model relies on the doser pump to ensure that the fuel is delivered in the correct proportions, which is vital for maintaining its operational standards. The doser pump’s precision helps in achieving the desired fuel efficiency and performance.

F4.5 CM2620 F139B

Lastly, the F4.5 CM2620 F139B engine is another model that is compatible with the Doser Pump 5418806. This engine benefits from the doser pump’s ability to provide a consistent and controlled fuel supply, which is essential for its performance and efficiency. The doser pump ensures that the engine operates smoothly and efficiently, meeting the demands of its applications.

Role of Part 5418806 Doser Pump in Aftertreatment Systems

The Part 5418806 Doser Pump is an integral component within the aftertreatment system of modern engine setups. Its primary function is to inject Diesel Exhaust Fluid (DEF) into the exhaust stream, which is essential for the Selective Catalytic Reduction (SCR) process. This process converts harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor.

Interaction with Key Components

1. SCR Catalyst: The Doser Pump works in conjunction with the SCR catalyst. The DEF injected by the pump reacts with the NOx over the catalyst, facilitating the chemical reaction that reduces emissions.

2. Exhaust Gas Recirculation (EGR) System: Although the EGR system reduces NOx by recirculating a portion of the exhaust gas back into the engine, the Doser Pump ensures that any remaining NOx is effectively neutralized.

3. Engine Control Unit (ECU): The ECU monitors various parameters such as exhaust temperature, engine load, and NOx levels. It sends signals to the Doser Pump to inject the appropriate amount of DEF, ensuring optimal performance and compliance with emission standards.

4. DEF Tank and Pump: The Doser Pump is connected to the DEF tank via a series of lines and filters. It draws DEF from the tank and precisely meters its injection into the exhaust stream.

5. NOx Sensors: Located upstream and downstream of the SCR catalyst, these sensors provide feedback to the ECU about the NOx levels before and after the DEF injection. This data helps the ECU fine-tune the Doser Pump’s operation.

6. Aftertreatment Control Module (ACM): In some systems, an ACM is used to manage the aftertreatment processes. The Doser Pump receives commands from the ACM to inject DEF based on real-time data from various sensors.

Operational Dynamics

The Doser Pump’s operation is dynamic and responsive to changing engine conditions. During high-load scenarios, the pump may increase the DEF injection rate to handle higher NOx levels. Conversely, during low-load or idle conditions, the injection rate may decrease to conserve DEF.

Conclusion

In summary, the Part 5418806 Doser Pump plays a significant role in ensuring that the aftertreatment system operates efficiently, maintaining low emissions and complying with environmental regulations. Its integration with various engine and aftertreatment components underscores its importance in modern engine systems.