3904839
Alternator Support
Cummins®

The 3904839 Alternator Support is a component designed to facilitate the operation of commercial trucks by providing a stable mounting point for the alternator. This part ensures that the alternator remains securely in place, allowing it to function effectively within the truck’s electrical system. Cummins, a well-established manufacturer in the diesel engine industry, produces this alternator support, leveraging its expertise to deliver reliable and durable components for commercial vehicles ¹.

Basic Concepts of Alternator Support

An alternator support serves as a mounting bracket that holds the alternator in position within a truck’s engine compartment. The alternator, a key component of the electrical system, generates electricity to power the truck’s electrical accessories and recharge the battery. The alternator support plays a role in maintaining the alternator’s alignment and stability, which is vital for its efficient operation. It interacts with other components such as the engine, battery, and electrical wiring, ensuring a cohesive and reliable electrical system ².

Purpose of the 3904839 Alternator Support

The 3904839 Alternator Support is designed to maintain the alternator’s position within the truck’s engine compartment. By providing a secure mounting point, it ensures that the alternator operates efficiently and remains aligned with the engine’s drive belt. This support is integral to the alternator’s function, as it allows the alternator to spin at the correct speed and angle, generating the necessary electrical power for the truck’s systems ³.

Key Features

The 3904839 Alternator Support is constructed with high-quality materials to ensure durability and reliability. It features precise mounting points that align with the alternator and engine components, facilitating easy installation and secure fitting. The design incorporates robust materials that can withstand the vibrations and stresses encountered in commercial truck operations, enhancing its functionality and longevity.

Benefits

The 3904839 Alternator Support offers several advantages, including improved durability and enhanced reliability of the electrical system. Its sturdy construction helps to minimize the risk of alternator misalignment or failure, contributing to the overall performance and efficiency of the truck. Additionally, the support’s design ensures that the alternator operates within optimal parameters, promoting consistent electrical output and reducing the likelihood of electrical system issues.

Installation Process

Installing the 3904839 Alternator Support involves several steps to ensure proper fitting and functionality. Begin by locating the mounting points on the engine and aligning the support with these points. Use the appropriate tools to secure the support in place, ensuring that it is firmly attached and aligned with the alternator. Double-check the alignment and tightness of the mounting bolts to confirm that the support is correctly installed. Following these steps will help to ensure that the alternator support functions effectively within the truck’s electrical system.

Troubleshooting Common Issues

Common issues with alternator supports may include misalignment, loose mounting, or damage from vibrations. These problems can lead to alternator failure or inefficient electrical system performance. To address these issues, inspect the support for signs of wear or damage, ensure that the mounting bolts are tight, and check the alignment of the alternator with the engine’s drive belt. Making necessary adjustments or replacements can help to resolve these problems and restore the electrical system’s reliability.

Maintenance Tips

Regular maintenance of the 3904839 Alternator Support is important to ensure its continued performance and reliability. Inspect the support periodically for signs of wear, corrosion, or damage. Clean the support and surrounding areas to remove any debris or buildup that could affect its function. If any issues are detected, make the necessary repairs or replacements to maintain the integrity of the electrical system. Adhering to these maintenance practices will help to prolong the lifespan of the alternator support and ensure optimal truck performance.

Cummins: Manufacturer Overview

Cummins Inc. is a leading manufacturer in the diesel engine industry, with a rich history of innovation and expertise. The company has established a strong reputation for producing high-quality, reliable engines and components for commercial trucks and other heavy-duty applications. Cummins’ commitment to excellence and continuous improvement has made it a trusted name in the industry, providing fleet operators with the confidence that their vehicles are equipped with top-tier components.

Cummins Alternator Support Part 3904839 Compatibility

The Cummins Alternator Support part number 3904839 is designed to be compatible with a range of Cummins engines. Specifically, it fits seamlessly with the following engine models:

• 4B3.9
• 6B5.9

These engines are part of Cummins’ lineup, known for their robust performance and reliability. The alternator support part 3904839 is engineered to provide a secure mounting for the alternator, ensuring optimal performance and longevity of the alternator within these engine systems.

For engines like the 4B3.9 and 6B5.9, the alternator support part 3904839 is crucial in maintaining the electrical system’s efficiency. It ensures that the alternator is properly aligned and secured, reducing wear and tear on the alternator and its associated components. This support part is integral for maintaining the overall health of the engine’s electrical system, providing a stable and reliable power source for the vehicle or machinery it powers.

Role of Part 3904839 Alternator Support in Engine Systems

The Alternator Support (part number 3904839) is an integral component in the mounting and stabilization of the alternator within various engine systems. Its primary function is to securely hold the alternator in place, ensuring it remains properly aligned with the engine’s accessory drive system. This support is essential for the efficient operation of the alternator, which is responsible for generating electrical power to charge the battery and power the vehicle’s electrical systems.

When installed, the Alternator Support interfaces directly with the engine block or other structural components, providing a stable foundation for the alternator. This stability is vital for maintaining the correct belt tension in the accessory drive system, which includes components such as the crankshaft pulley, idler pulleys, and tensioner pulleys. Proper belt tension ensures that the alternator rotates at the correct speed to generate the necessary electrical output.

Additionally, the Alternator Support helps to dampen vibrations transmitted from the engine to the alternator. By reducing these vibrations, the support contributes to the longevity and reliable operation of the alternator. This is particularly important in high-performance or high-stress engine environments where vibrations can be more pronounced.

In summary, the Alternator Support (part 3904839) plays a significant role in the overall functionality and durability of the alternator within the engine system. Its proper installation and maintenance are key to ensuring the alternator operates efficiently and reliably, contributing to the vehicle’s electrical system performance.

Conclusion

The 3904839 Alternator Support is a critical component in the operation of commercial trucks, ensuring the alternator remains securely mounted and aligned within the engine compartment. Its robust construction and precise design contribute to the durability and reliability of the truck’s electrical system. Regular maintenance and proper installation are essential to maximize the performance and longevity of this Cummins part.