3979568
Alternator
Cummins®

The Cummins 3979568 Alternator is a component designed for use in commercial trucks. It serves to generate electrical power to charge the vehicle’s battery and to supply electricity to the truck’s electrical systems while the engine is running. This part is significant in maintaining the operational integrity of the truck’s electrical components and ensuring that the battery remains charged for reliable engine starting and accessory operation.

Basic Concepts of an Alternator

An alternator is a device that converts mechanical energy into electrical energy. It functions by using a rotor that spins within a stationary stator, creating a changing magnetic field that induces an alternating current (AC) in the stator windings. This AC is then converted into direct current (DC) by a rectifier, which is used to charge the battery and power the vehicle’s electrical systems. Alternators differ from generators in that they produce AC that is converted to DC, whereas generators typically produce DC directly ¹.

Purpose of the Cummins 3979568 Alternator

The Cummins 3979568 Alternator plays a role in the operation of a truck by generating electrical power to maintain the charge of the battery and to provide the necessary electricity for the truck’s electrical components while the engine is in operation. This ensures that all electrical systems, from lighting to communication devices, function correctly and that the battery is ready to start the engine when required.

Key Features

The Cummins 3979568 Alternator is characterized by its robust design and high build quality, which contribute to its reliability and longevity. It is engineered for efficiency, providing a consistent power output to meet the demands of modern commercial trucks. This alternator may also incorporate unique technological advancements that enhance its performance and durability in demanding environments.

Benefits

Using the Cummins 3979568 Alternator offers several advantages. It is known for its reliability and durability, ensuring consistent performance over time. The alternator is efficient in its power output, which helps in maintaining the truck’s electrical systems without overloading. It is designed to be compatible with specific truck models, ensuring a proper fit and function within the vehicle’s electrical system.

Installation Considerations

When installing the Cummins 3979568 Alternator, it is important to consider factors such as proper alignment with the engine’s drive belt, secure mounting to prevent vibration-related issues, and correct electrical connections to ensure efficient power transfer and to avoid potential electrical faults.

Troubleshooting Common Issues

Alternators can encounter issues such as electrical faults or mechanical wear. Common problems may include a failure to charge the battery, unusual noises from the alternator, or a burning smell indicating overheating. Diagnostic steps for resolving these issues may involve checking the electrical connections, inspecting the belt tension and condition, and testing the alternator’s output with a multimeter.

Maintenance Tips

To ensure the longevity and optimal performance of the Cummins 3979568 Alternator, regular maintenance is recommended. This includes periodic inspections for signs of wear or damage, cleaning the alternator to remove any dirt or debris that could affect its operation, and replacing any worn components such as brushes or the drive belt as needed.

Cummins Corporation Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including diesel engines and related technologies. With a history of innovation and a commitment to quality, Cummins has established a reputation for producing reliable and efficient power systems for various applications, including commercial trucks. The company’s focus on technological advancement and customer satisfaction has positioned it as a leader in the industry ².

Compatibility with Engine Models

The Cummins Alternator 3979568 is designed to be compatible with a range of engine models, ensuring reliable power generation and efficient electrical system performance. This alternator is engineered to meet the specific needs of various engine configurations, providing robust functionality across different applications.

4B3.9 Engine Series

For the 4B3.9 engine series, the alternator 3979568 ensures the engine’s electrical system operates smoothly. This alternator is engineered to handle the specific power demands and electrical requirements of the 4B3.9 engines, ensuring consistent performance and longevity.

6B5.9 Engine Series

Similarly, the 6B5.9 engine series benefits from the use of the Cummins Alternator 3979568. This alternator is tailored to support the higher power output and complex electrical needs of the 6B5.9 engines. Its design ensures that the alternator can deliver the necessary electrical power to support the engine’s operation and ancillary systems.

Grouping and Application

The Cummins Alternator 3979568 is part of a broader range of alternators designed for various engine applications. This particular model is specifically engineered to fit seamlessly with the 4B3.9 and 6B5.9 engines, ensuring compatibility and optimal performance. Its design allows it to be integrated into these engines without requiring significant modifications, making it a versatile choice for maintenance and replacement purposes.

By choosing the Cummins Alternator 3979568, users can expect reliable performance and durability, ensuring that their engines continue to operate efficiently and effectively.

Understanding the Integration of Part 3979568 Alternator in Engine Systems

The alternator, specifically part 3979568, is a component in the electrical system of an engine. Its primary function is to convert mechanical energy into electrical energy, which is then used to power the vehicle’s electrical systems and recharge the battery.

Role in the Electrical System

The alternator is driven by a belt connected to the engine’s crankshaft. As the engine runs, the alternator spins, generating electricity. This electricity is then regulated by the voltage regulator, which ensures a consistent voltage is supplied to the battery and electrical components.

Interaction with Other Components

1. Battery: The alternator works in tandem with the battery to maintain the vehicle’s electrical system. While the battery provides the initial power to start the engine, the alternator takes over once the engine is running, supplying continuous power and recharging the battery.

2. Voltage Regulator: This component monitors the electrical output of the alternator. It adjusts the field current to the alternator’s rotor, ensuring the voltage remains within a safe range, typically around 13.5 to 14.5 volts.

3. Drive Belt: The alternator is connected to the engine via a drive belt. This belt transfers the mechanical energy from the engine to the alternator, allowing it to spin and generate electricity.

4. Electrical Loads: The alternator supplies power to various electrical components in the vehicle, including the headlights, ignition system, fuel injection system, and entertainment systems. It ensures these components receive a steady and sufficient power supply.

5. ECU (Engine Control Unit): The alternator’s output is monitored by the ECU, which can adjust engine parameters to optimize alternator performance and efficiency. This includes managing the engine’s RPM to ensure the alternator operates within its optimal range.

6. Charging System Indicator: Many vehicles are equipped with a dashboard indicator that monitors the charging system. This indicator alerts the driver if there is an issue with the alternator or battery, ensuring timely maintenance and repairs.

Conclusion

In summary, the Cummins 3979568 Alternator is a vital component that ensures the vehicle’s electrical system operates efficiently. Its integration with the engine, battery, and various electrical components highlights its importance in maintaining the overall functionality and performance of the vehicle.