3939890
Alternator Bracket
Cummins®

The 3939890 Alternator Bracket is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industries. This bracket is significant in the context of heavy-duty trucks as it plays a role in the vehicle’s electrical system by securing the alternator, which is vital for power generation and distribution ⁴.

Basic Concepts of Alternator Brackets

An alternator bracket serves as a mounting point for the alternator within a vehicle’s engine compartment. Its function is to hold the alternator in place and ensure it operates correctly within the vehicle’s electrical system. The bracket interfaces with both the alternator and the engine, providing a stable platform for the alternator to function efficiently ¹.

Purpose of the 3939890 Alternator Bracket

The 3939890 Alternator Bracket is designed to secure the alternator in heavy-duty trucks. By providing a stable mounting solution, it facilitates the alternator’s role in generating electrical power, which is then used to charge the battery and power the vehicle’s electrical systems. This bracket ensures that the alternator remains in the correct position and operates under the appropriate conditions for optimal performance ².

Key Features

The 3939890 Alternator Bracket is characterized by its robust design and material selection, which contribute to its performance and durability. It is crafted from high-quality materials to withstand the rigors of heavy-duty truck operations. Unique attributes of this bracket may include precision engineering for exact fitment, corrosion-resistant coatings for longevity, and a design that accommodates the specific contours of the alternator and engine it supports ³.

Benefits

The advantages of the 3939890 Alternator Bracket include enhanced stability for the alternator, which can lead to improved reliability of the electrical system. A securely mounted alternator is less likely to experience vibrations that could affect its performance. Additionally, the bracket’s design may contribute to the overall efficiency of the vehicle’s electrical system, potentially improving vehicle performance ⁴.

Installation Considerations

When installing the 3939890 Alternator Bracket, it is important to follow guidelines and best practices to ensure proper fitment. Preparatory steps may include cleaning the mounting area and inspecting the bracket for any damage. The tools required for installation will depend on the specific truck model, but typically include wrenches and possibly a torque wrench to secure the bracket to the specified torque settings. Alignment procedures should be followed to ensure the alternator is correctly positioned relative to the engine and other components ¹.

Troubleshooting and Maintenance

Common issues with alternator brackets can include loosening over time due to engine vibrations or corrosion. Diagnostic procedures for identifying problems may involve visual inspections for signs of wear or damage, as well as checking the tightness of the bracket’s mounting bolts. Maintenance tips to prolong the lifespan of the 3939890 Alternator Bracket include regular inspections for corrosion or damage, ensuring the bracket remains securely fastened, and addressing any issues promptly to prevent further complications ².

Cummins: Manufacturer 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 and innovation in the automotive and heavy-duty truck industries. The company’s product range includes a variety of components and systems designed to enhance the performance and reliability of vehicles.

Cummins Alternator Bracket 3939890 Compatibility

The Cummins Alternator Bracket part number 3939890 is designed to fit a variety of Cummins engines, ensuring a secure and reliable mounting for the alternator. This bracket is engineered to maintain the alternator’s position and alignment, which is crucial for the proper functioning of the engine’s electrical system.

B5.9 Series

The B5.9 G and B5.9 GAS PLUS CM556 engines are part of the B5.9 series, which are known for their robust performance and reliability. The 3939890 alternator bracket is specifically designed to fit these engines, providing a stable mounting point that can withstand the rigors of continuous operation.

ISB Series

The ISB CM550 and ISB CM850 engines are part of the ISB series, which are widely used in various applications due to their efficiency and durability. The 3939890 alternator bracket is compatible with these engines, ensuring that the alternator is securely mounted and properly aligned. This compatibility is essential for maintaining the electrical system’s integrity and preventing any potential issues that could arise from a loose or misaligned alternator.

By using the 3939890 alternator bracket, technicians and operators can ensure that the alternator is correctly positioned, which is vital for the overall health and performance of the engine. This bracket is a critical component in maintaining the electrical system’s functionality and reliability across these Cummins engines ³.

Role of Part 3939890 Alternator Bracket in Engine Systems

The Alternator Bracket, identified by part number 3939890, serves as a fundamental component in the integration of the alternator within various engine systems. This bracket is engineered to provide a secure and stable mounting point for the alternator, ensuring it remains firmly in place despite the vibrations and movements inherent to engine operation.

When installed, the Alternator Bracket interfaces directly with the engine block or a designated mounting surface, offering a robust foundation for the alternator. This secure attachment is essential for the alternator’s efficient operation, as it allows for the proper alignment of the alternator’s pulley with the engine’s drive belt. The alignment is key to the transfer of mechanical energy from the engine to the alternator, facilitating the generation of electrical power necessary for the vehicle’s electrical systems.

Furthermore, the Alternator Bracket plays a role in managing the thermal environment around the alternator. By maintaining a consistent position, it aids in the efficient dissipation of heat generated during operation, contributing to the longevity and reliability of the alternator.

In summary, the Alternator Bracket (part 3939890) is integral to the alternator’s mounting and operational efficiency within engine systems. Its design and placement are tailored to support the alternator’s function, ensuring a stable, aligned, and thermally managed environment for optimal performance ⁴.

Conclusion

The 3939890 Alternator Bracket is a critical component in the electrical systems of heavy-duty trucks, ensuring the alternator is securely mounted and operates efficiently. Its robust design, compatibility with various Cummins engines, and role in maintaining the alternator’s alignment and thermal management contribute to the overall reliability and performance of the vehicle’s electrical system.