4988274
Alternator
Cummins®

The Cummins 4988274 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 electricity to the truck’s electrical components while the engine is running. This alternator is integral to maintaining the truck’s operational efficiency and ensuring that all electrical systems function correctly ¹.

Basic Concepts of Alternators

An alternator is a device that converts mechanical energy into electrical energy. It operates within a vehicle’s electrical system to generate and regulate electrical power. The alternator consists of a rotor, stator, rectifier, and regulator. As the engine drives the alternator, the rotor spins within the stator, generating an alternating current (AC). The rectifier converts this AC into direct current (DC), which is then regulated to maintain a consistent voltage output. This regulated DC power is used to charge the battery and power the vehicle’s electrical systems ².

Purpose of the 4988274 Alternator

The Cummins 4988274 Alternator is specifically designed to meet the demanding requirements of commercial trucks. It plays a role in the truck’s operation by charging the battery and providing the necessary electrical power to operate lights, instruments, and other electrical components while the engine is running. This ensures that the truck’s electrical systems remain functional, supporting safe and efficient operation ³.

Key Features

The Cummins 4988274 Alternator is notable for its robust design and high build quality. It is engineered to deliver reliable performance under the strenuous conditions typical of commercial truck operations. Key features include a durable construction, efficient power generation, and a design that enhances cooling and reduces noise. These characteristics contribute to its reliability and effectiveness in demanding applications ⁴.

Benefits

Using the Cummins 4988274 Alternator offers several advantages. Its reliability ensures consistent performance, reducing the likelihood of electrical failures. The alternator’s durability allows it to withstand the rigors of commercial truck use, providing long-term value. Additionally, its efficiency in power generation helps maintain optimal battery charge and electrical system performance, contributing to the overall reliability and efficiency of the truck ⁵.

Installation and Compatibility

Installing the Cummins 4988274 Alternator involves fitting it onto the truck’s engine, connecting it to the electrical system, and ensuring it is properly secured. Specific requirements may vary depending on the truck model, so it is important to follow the manufacturer’s guidelines for installation. The alternator is compatible with various Cummins engines and is designed to fit a range of commercial truck makes and models, ensuring versatility and ease of use ⁶.

Maintenance and Troubleshooting

To ensure the optimal performance and longevity of the Cummins 4988274 Alternator, regular maintenance is recommended. This includes inspecting the alternator for signs of wear or damage, cleaning it to remove any debris, and checking the electrical connections for corrosion or looseness. Troubleshooting common issues such as voltage fluctuations or charging problems may involve checking the alternator’s output, inspecting the battery, and ensuring the electrical system is functioning correctly ⁷.

Performance and Efficiency

The Cummins 4988274 Alternator is designed to deliver high performance and efficiency under various operating conditions. It is capable of handling high electrical loads and maintaining a stable voltage output, ensuring that the truck’s electrical systems operate smoothly. Its ability to adapt to different driving scenarios contributes to its effectiveness in commercial truck applications ⁸.

Cummins Corporation

Cummins Inc. is a well-established manufacturer in the automotive industry, known for producing high-quality automotive components. The company has a long history of innovation and commitment to excellence, which is reflected in its products, including the 4988274 Alternator. Cummins’ reputation for reliability and performance makes it a trusted choice for commercial truck operators and maintenance professionals ⁹.

Cummins Alternator 4988274 Compatibility

The Cummins alternator part number 4988274 is designed to fit a variety of Cummins engines, ensuring reliable power generation across different applications. Here is a detailed breakdown of the engine compatibility for this alternator:

Cummins B Series Engines

• B3.9 G
• B4.5
• B4.5 RGT
• B5.9 G
• B5.9 GAS PLUS CM556

Cummins C Series Engines

• C GAS PLUS CM556

Cummins QSB Series Engines

• QSB3.3 CM2150
• QSB3.9 30 CM550
• QSB4.5 CM850 (CM2850)
• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

Cummins QSC Series Engines

• QSC8.3 CM554
• QSC8.3 CM850 (CM2850)

Cummins QSL Series Engines

• QSL8.9 CM2150 L141
• QSL9 CM554
• QSL9 CM850 (CM2850)

Cummins 4B Series Engines

• 4B3.9

Cummins 6B Series Engines

• 6B5.9

Cummins 6C Series Engines

• 6C8.3

Cummins G Series Engines

• G5.9
• G8.3

This alternator is engineered to provide robust and efficient power generation, making it a suitable choice for the listed engines. It ensures that the electrical systems of these engines are adequately supported, contributing to their overall performance and reliability ¹⁰.

Understanding the Role of Part 4988274 Alternator in Engine Systems

Part 4988274, an alternator, is integral to the functionality of various engine systems. Its primary role is to generate electrical power, which is essential for the operation of numerous components within the engine system.

Electrical Power Generation

The alternator converts mechanical energy from the engine into electrical energy. This energy is used to power the vehicle’s electrical systems and recharge the battery. The alternator is driven by a belt connected to the engine’s crankshaft, ensuring a continuous supply of power as the engine runs ¹¹.

Battery Charging

One of the key functions of the alternator is to maintain the battery’s charge. As the vehicle operates, the battery provides power to start the engine and run electrical components. The alternator ensures that the battery remains charged, allowing for consistent performance and reliability ¹².

Powering Electrical Components

The electrical power generated by the alternator is distributed throughout the vehicle to power various components. This includes the ignition system, fuel injection system, lighting, and entertainment systems. Consistent and reliable power supply from the alternator ensures these components function correctly ¹³.

Supporting Engine Management Systems

Modern engines rely heavily on electronic control units (ECUs) to manage performance, fuel efficiency, and emissions. The alternator provides the necessary power for these systems to operate, ensuring optimal engine performance and compliance with emissions standards ¹⁴.

Integration with the Drive Belt System

The alternator is typically connected to the engine via a drive belt. This belt also connects to other components such as the water pump and air conditioning compressor. The alternator’s efficient operation within this system is vital for the overall performance and reliability of the engine ¹⁵.

Role in Starting the Engine

While the primary function of the alternator is to generate power while the engine is running, it also plays a role in starting the engine. A well-charged battery, maintained by the alternator, ensures that the starter motor has sufficient power to crank the engine effectively ¹⁶.

Enhancing Vehicle Performance

By ensuring a stable and consistent power supply, the alternator contributes to the overall performance and efficiency of the vehicle. It supports the engine’s ability to run smoothly, respond to driver inputs, and maintain optimal operating conditions ¹⁷.

Conclusion

In summary, the Cummins 4988274 Alternator is a fundamental component in the engine system, providing essential electrical power that supports a wide range of functions and ensures the vehicle operates efficiently and reliably. Its robust design, high build quality, and efficient performance make it a trusted choice for commercial truck operators and maintenance professionals.