3906869
Coupling Disc
Cummins®

The 3906869 Coupling Disc, manufactured by Cummins, is a component designed for use in commercial trucks. It serves a pivotal role in the operation of these vehicles by facilitating the transfer of power from the engine to the transmission and other drivetrain components. Cummins, a well-established name in the automotive industry, is recognized for its commitment to quality and innovation in manufacturing components that enhance the performance and reliability of commercial vehicles.

Basic Concepts of Coupling Discs

A coupling disc is a component within a drivetrain that connects two shafts, allowing for the transmission of torque and rotation between them. It plays a role in ensuring smooth and efficient power transmission from the engine to the transmission and, subsequently, to the wheels. Coupling discs are typically constructed from durable materials such as steel or composite materials, designed to withstand the high stresses and loads encountered in commercial truck operations ¹.

Purpose of the 3906869 Coupling Disc

This Cummins part is specifically engineered to enhance the power transmission process in commercial trucks. It acts as an intermediary between the engine and the transmission, ensuring that power is efficiently and smoothly transferred. This component is integral to maintaining the operational integrity of the drivetrain, contributing to the overall performance and reliability of the truck.

Key Features

The 3906869 is characterized by its robust design and the use of high-quality materials. Its construction includes precision-machined surfaces to ensure a perfect fit and optimal performance. The disc is also designed with features that enhance its durability and resistance to wear, ensuring long-term reliability in demanding commercial truck applications.

Benefits

Utilizing this part in commercial trucks offers several advantages. It contributes to improved power transmission efficiency, reducing energy loss during the transfer of power from the engine to the transmission. Additionally, its durable construction enhances the overall durability of the drivetrain, potentially leading to improved fuel economy and extended component life. These factors collectively contribute to enhanced truck performance and reliability.

Installation and Integration

Proper installation of the 3906869 is crucial for ensuring optimal performance and longevity. It should be installed according to the manufacturer’s guidelines, which may include specific torque settings and alignment procedures. Careful attention to these details during installation helps to ensure that the coupling disc functions as intended, providing reliable power transmission and contributing to the overall efficiency of the drivetrain.

Troubleshooting and Maintenance

Regular maintenance and timely troubleshooting are important for prolonging the service life of the 3906869. Signs of wear or potential failure modes, such as unusual noises or vibrations during operation, should be addressed promptly. Recommended maintenance practices include periodic inspections for signs of wear and ensuring that all connections are secure and properly aligned. Adhering to these practices helps to maintain the efficiency and reliability of the coupling disc and the overall drivetrain.

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 quality, innovation, and reliability in the commercial truck industry. The company’s commitment to excellence is evident in its wide range of products, which are designed to meet the demanding requirements of commercial vehicle applications. Cummins’ dedication to quality and innovation ensures that its components, including the 3906869, contribute to the performance, efficiency, and reliability of commercial trucks.

Compatibility with Cummins Engines

The 3906869 is designed to fit a variety of Cummins engines, ensuring a secure connection between the engine and its driven components. This part is crucial for maintaining the integrity of the power transmission system. Below is a detailed breakdown of the engines that are compatible with this coupling disc:

4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines are part of the B Series family, known for their robust design and reliability. The 3906869 is engineered to fit these engines, ensuring a tight and efficient connection that can withstand the high torque and power output of these models.

6C8.3 and B4.5 CM2350 B129B

The 6C8.3 engine, along with the B4.5 CM2350 B129B, benefits from the 3906869. This part is designed to handle the specific torque and rotational demands of these engines, providing a reliable interface between the engine and the driven components.

B5.9 G and D4.0 CM2620 D103B

Both the B5.9 G and D4.0 CM2620 D103B engines are compatible with the 3906869. This part ensures that the connection between the engine and its driven components remains secure, even under high-stress conditions.

F4.5 CM2620 F139B and ISB CM550

The F4.5 CM2620 F139B and ISB CM550 engines are designed for heavy-duty applications, and the 3906869 is engineered to meet these demands. This part provides a reliable and durable connection, ensuring optimal performance and longevity.

ISB/ISD4.5 CM2150 B119 and ISB/ISD6.7 CM2150 SN

The ISB/ISD4.5 CM2150 B119 and ISB/ISD6.7 CM2150 SN engines are part of the ISB/ISD family, known for their versatility and power. The 3906869 is designed to fit these engines, providing a secure and efficient connection that can handle the high torque and power output.

ISBE CM2150, ISBE CM800, and ISBE4 CM850

The ISBE series engines, including the CM2150, CM800, and CM850, are designed for a range of applications, from construction to power generation. The 3906869 is engineered to fit these engines, ensuring a reliable and efficient connection.

ISF3.8 CM2220 AN and QSB5.9 CM550

The ISF3.8 CM2220 AN and QSB5.9 CM550 engines are part of the Cummins lineup, designed for various industrial applications. The 3906869 is compatible with these engines, providing a secure and efficient connection that can withstand the demands of heavy-duty use.

Role of the 3906869 in Engine Systems

The 3906869 is an integral component in the synchronization and efficient operation of various engine systems. It facilitates the seamless transfer of rotational force between the main pump and the auxiliary pump, ensuring that both systems operate in harmony.

In the context of the auxiliary pump, the Coupling Disc allows for the precise transmission of power, which is essential for the pump’s function in providing additional fluid flow when the primary system demands it. This ensures that the auxiliary pump can respond quickly to changes in system requirements, maintaining optimal performance and reliability.

When integrated with the main pump, the Coupling Disc ensures that the rotational energy is consistently and efficiently transferred. This is particularly important in high-demand scenarios where the main pump must deliver a steady and powerful fluid stream. The Coupling Disc’s role here is to maintain synchronization, reducing the likelihood of mechanical stress and enhancing the longevity of the pump components.

Overall, the 3906869 plays a significant role in enhancing the operational efficiency and reliability of both the main and auxiliary pump systems within the engine. Its ability to facilitate smooth power transmission is key to the sustained performance of these critical components ².

Conclusion

The 3906869 Coupling Disc is a critical component in the drivetrain of commercial trucks, designed to ensure efficient and reliable power transmission from the engine to the transmission and other drivetrain components. Its robust design, compatibility with a wide range of Cummins engines, and the benefits it offers in terms of performance and reliability make it a valuable component in the maintenance and operation of commercial vehicles.