4936878
Alternator
Cummins®

The Cummins 4936878 Alternator is a component designed for use in commercial trucks, playing a significant role in the vehicle’s electrical system. Its primary function is to generate electrical power to charge the battery and supply power to the truck’s electrical components while the engine is running. This ensures that the truck operates efficiently and reliably, supporting various systems and accessories essential for its function ¹.

Basic Concepts of Alternators

An alternator is a device that converts mechanical energy into electrical energy. It is a key component of a vehicle’s electrical system, responsible for generating power to charge the battery and operate electrical components. Unlike generators, which produce direct current (DC), alternators produce alternating current (AC), which is then converted to DC by a rectifier within the alternator. This conversion allows the alternator to efficiently charge the battery and power the vehicle’s electrical systems ².

Purpose of the 4936878 Alternator

The Cummins 4936878 Alternator serves a vital role in the operation of a truck by generating electrical power. It charges the battery, ensuring that it remains at an optimal charge level, and powers the truck’s electrical components, such as lights, radios, and other accessories, while the engine is running. This continuous supply of electrical power is crucial for the truck’s operation, allowing it to function smoothly and efficiently ³.

Key Features

The Cummins 4936878 Alternator is characterized by its robust design and construction, utilizing high-quality materials to ensure durability and reliability. It incorporates advanced technological features, such as efficient cooling systems and precise voltage regulation, to enhance its performance. These features contribute to the alternator’s ability to operate under various conditions, providing consistent and reliable electrical power ⁴.

Benefits

The Cummins 4936878 Alternator offers several benefits, including improved efficiency, reliability, and performance. Its advanced design and construction materials contribute to its durability, ensuring long-term operation without frequent replacements. Additionally, its efficient power generation and precise voltage regulation help maintain optimal battery charge levels and support the truck’s electrical systems, enhancing overall performance and reliability.

Installation

When installing the Cummins 4936878 Alternator, it is important to consider compatibility with the specific truck model and follow any special requirements or procedures. Proper installation ensures that the alternator functions correctly and efficiently, contributing to the truck’s overall performance and reliability. It is recommended to consult the manufacturer’s guidelines or a professional technician for installation to ensure optimal results.

Maintenance and Troubleshooting

To ensure the optimal performance of the Cummins 4936878 Alternator, regular maintenance is recommended. This includes inspecting the alternator for any signs of wear or damage, cleaning it to remove any dirt or debris, and replacing worn components as needed. Additionally, troubleshooting common issues such as voltage fluctuations or charging problems can help identify and address any potential problems, ensuring the alternator continues to operate efficiently.

Cummins Overview

Cummins Inc. is a well-established manufacturer with a strong reputation in the industry for producing high-quality commercial truck components. The company has a history of innovation and commitment to quality, consistently delivering reliable and efficient products. Cummins’ dedication to advancing technology and improving performance has made it a trusted name in the commercial truck industry, providing customers with components that enhance the operation and reliability of their vehicles.

Cummins Alternator 4936878 Compatibility

The Cummins Alternator part number 4936878 is designed to be compatible with a range of Cummins engines, ensuring reliable power generation across various applications. Here is a detailed look at the compatibility of this alternator with the specified engines:

ISB Series

• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

The ISB series engines, known for their robust performance and efficiency, are well-suited for the 4936878 alternator. This alternator provides the necessary power to meet the demands of these engines, ensuring consistent performance and reliability.

ISC Series

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

The ISC series engines benefit from the 4936878 alternator, which is engineered to deliver the required electrical output. This compatibility ensures that these engines operate smoothly, with the alternator providing sufficient power for all electrical systems.

ISL Series

• ISL CM2150
• ISL CM554
• ISL9 CM2150 SN
• ISL9 CM2250

The ISL series engines, designed for heavy-duty applications, are compatible with the 4936878 alternator. This alternator is built to handle the high electrical demands of these engines, ensuring reliable power generation even under heavy loads.

ISM Series

• ISM CM570
• ISM CM570/870

The ISM series engines, known for their versatility and performance, are also compatible with the 4936878 alternator. This compatibility ensures that these engines receive the necessary electrical power to function optimally.

ISX Series

• ISX CM570

The ISX series engine is designed for high-performance applications and is compatible with the 4936878 alternator. This alternator provides the necessary power to meet the demands of this high-output engine, ensuring reliable performance.

Other Cummins Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• B5.9 G
• B5.9 GAS PLUS CM556
• C GAS PLUS CM556

The 4936878 alternator is also compatible with these other Cummins engines, ensuring that they receive the necessary power to operate efficiently. This compatibility extends the versatility of the alternator, making it suitable for a wide range of applications.

Role of Part 4936878 Alternator in Engine Systems

The alternator, specifically part 4936878, is integral to the functionality of various engine systems. It is primarily responsible for generating electrical power to recharge the battery and supply power to the electrical components while the engine is running.

When the engine is operational, the alternator is driven by a belt connected to the crankshaft. This mechanical energy is converted into electrical energy through the alternator’s internal components, including the rotor and stator. The generated electricity is then regulated by the voltage regulator, ensuring a consistent output that meets the vehicle’s electrical demands.

In conjunction with the battery, the alternator maintains the electrical system’s voltage stability. This is essential for the proper operation of components such as the ignition system, fuel injection system, lighting, and various sensors and control modules.

Additionally, the alternator works in harmony with the engine control unit (ECU) to monitor and adjust the electrical load. The ECU can signal the alternator to increase or decrease its output based on the vehicle’s operational requirements, ensuring optimal performance and efficiency.

The alternator also plays a role in the vehicle’s starting system. Once the engine is started, the alternator takes over from the battery to provide the necessary electrical power, allowing the starter motor to disengage. This seamless transition is vital for the engine’s continuous operation and the vehicle’s overall performance.

Conclusion

The Cummins 4936878 Alternator is a critical component in the electrical system of commercial trucks, ensuring efficient and reliable operation. Its robust design, advanced features, and compatibility with a wide range of Cummins engines make it a valuable asset for maintaining the electrical integrity of these vehicles. Regular maintenance and proper installation are essential to maximize the performance and longevity of this part.