4936879
Alternator
Cummins®

The Cummins 4936879 Alternator is a component designed for use in commercial trucks. Its purpose is to generate electrical power to charge the vehicle’s battery and supply electricity to the truck’s electrical systems while the engine is running. This alternator is significant in maintaining the operational integrity of the truck’s electrical system, ensuring that all electrical components function correctly during operation ³.

Basic Concepts of an Alternator

An alternator is a device that converts mechanical energy into electrical energy. It operates using a rotor that spins within a stationary set of coils, known as the stator, generating an alternating current (AC) that is then converted into direct current (DC) by a rectifier. This DC power is used to charge the battery and power the vehicle’s electrical systems. Alternators differ from generators in that alternators produce AC that is converted to DC, whereas generators directly produce DC ².

Purpose of the 4936879 Alternator in Truck Operation

The 4936879 Alternator plays a role in the electrical system of a commercial truck by ensuring a consistent supply of electrical power. It charges the battery during engine operation and provides the necessary electricity to power the truck’s electrical components, such as lights, radio, and other systems. This ensures that the truck can operate its electrical systems without draining the battery, maintaining a balance between power consumption and generation ³.

Key Features of the 4936879 Alternator

The Cummins 4936879 Alternator is characterized by its robust design and construction. It is built with high-quality materials to withstand the demanding conditions of commercial truck operations. The alternator incorporates advanced technological features, such as efficient cooling systems and durable bearings, to enhance its performance and longevity. These features contribute to its reliability and effectiveness in heavy-duty applications ¹.

Benefits of Using the 4936879 Alternator

Installing the 4936879 Alternator in commercial trucks offers several advantages. It provides improved reliability, ensuring consistent electrical power supply under various operating conditions. The alternator’s efficient design contributes to better fuel economy by reducing the load on the engine. Additionally, its robust construction allows it to perform well under heavy-duty conditions, making it a suitable choice for commercial truck applications ³.

Installation Considerations

Proper installation of the 4936879 Alternator is important for its optimal performance and longevity. It is designed to be compatible with a range of commercial truck models. Professional installation is recommended to ensure that the alternator is correctly fitted and aligned, and that all electrical connections are secure. This helps prevent issues such as electrical shorts or inefficient power generation ².

Maintenance and Troubleshooting

Regular maintenance practices are recommended to ensure the longevity and optimal performance of the 4936879 Alternator. This includes checking the alternator’s connections, inspecting the belt for wear, and ensuring the cooling system is functioning correctly. Common troubleshooting tips for addressing potential issues include checking for loose connections, inspecting the belt tension, and ensuring the alternator is receiving proper voltage from the engine ¹.

Performance in Various Conditions

The 4936879 Alternator is designed to perform under a range of operating conditions. It can operate effectively in extreme temperatures, high altitudes, and under heavy load situations. Its robust construction and advanced features allow it to maintain consistent electrical output, ensuring that the truck’s electrical systems remain functional regardless of the operating environment ³.

Cummins Corporation Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions. With a history spanning over a century, Cummins has established a reputation for quality and innovation in the automotive and heavy-duty truck industry. The company offers a comprehensive product range, including engines, filtration, emissions solutions, and power systems, catering to various industries and applications. Cummins’ commitment to excellence and customer satisfaction has solidified its position as a trusted name in the industry.

Cummins Alternator 4936879 Compatibility

The Cummins Alternator part number 4936879 is designed to be compatible with a range of Cummins engines, ensuring reliable power generation and electrical support across various applications. Below is a detailed breakdown of the engines with which this alternator is compatible:

6C8.3 Series

• 6C8.3
• 6C8.3 CM558

G8.3 Series

• G8.3
• G8.3 CM558

G855 Series

• G855
• G855 CM558

GTA8.3 Series

• GTA8.3 CM558

ISB Series

• ISB CM550
• ISB5.9G CM2180

ISBE Series

• ISBE CM800
• ISBE4 CM850

ISC Series

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

ISL Series

• ISL CM2150
• ISL CM554
• ISL G CM2180

B Series

• B4.5
• B5.9
• B5.9 G
• B5.9 GAS PLUS CM556
• C GAS PLUS CM556

G Series

• G5.9
• G5.9 CM558

This alternator is engineered to meet the specific electrical requirements of these engines, ensuring efficient power generation and system reliability. The compatibility with a broad range of Cummins engines makes the 4936879 alternator a versatile choice for various heavy-duty applications.

Role of Part 4936879 Alternator in Engine Systems

The alternator, specifically part 4936879, is an essential component in the engine system, responsible for generating electrical power to sustain the vehicle’s electrical systems while the engine is running. It works in conjunction with several other components to ensure the vehicle operates efficiently.

Interaction with the Engine

The alternator is driven by a belt connected to the engine’s crankshaft. As the engine runs, the crankshaft rotates the alternator, which in turn generates electricity. This electrical energy is used to power various systems within the vehicle, including the ignition system, lighting, and electronic control units ².

Battery Relationship

The alternator maintains the battery’s charge by converting mechanical energy from the engine into electrical energy. This ensures that the battery remains sufficiently charged to start the engine and power electrical components when the engine is not running ³.

Electrical System Support

In addition to charging the battery, the alternator supplies power to the vehicle’s electrical systems while the engine is operating. This includes the fuel injection system, which relies on a consistent electrical supply to deliver the precise amount of fuel needed for combustion ¹.

Integration with the Voltage Regulator

The alternator works in tandem with the voltage regulator to maintain a stable output voltage, typically around 13.8 to 14.4 volts. The voltage regulator monitors the electrical system’s voltage and adjusts the alternator’s output to prevent overcharging or undercharging the battery ².

Contribution to Starter Motor Function

During engine start-up, the alternator assists in providing the necessary electrical power to the starter motor. Once the engine is running, the alternator takes over the role of supplying power to the electrical systems, allowing the starter motor to disengage ³.

Support for Accessory Drive Belts

The alternator is often part of a system involving multiple accessory drive belts. These belts may also drive components such as the power steering pump, air conditioning compressor, and water pump. The alternator’s efficient operation ensures that these components receive the necessary power without overloading the engine ¹.

Role in On-Board Diagnostics

Modern vehicles are equipped with on-board diagnostic systems that monitor the performance of various components, including the alternator. The alternator’s output is continuously monitored to ensure it is within specified parameters, helping to diagnose potential issues before they lead to system failures ².

Conclusion

In summary, the 4936879 Alternator plays a significant role in maintaining the electrical integrity of the engine system, ensuring that all interconnected components function harmoniously. Its robust design, efficient performance, and compatibility with a wide range of Cummins engines make it a reliable choice for commercial truck applications ³.