3928861
Accessory Drive Gear
Cummins®

The Accessory Drive Gear 3928861, manufactured by Cummins, is a component designed for use in commercial trucks. Cummins, a well-established name in the engine manufacturing industry, produces this gear to enhance the functionality and efficiency of truck engines. The Accessory Drive Gear 3928861 is integral to the operation of commercial trucks, ensuring that various engine accessories function correctly.

Basic Concepts of Accessory Drive Gear

An Accessory Drive Gear is a mechanical component that transfers rotational force from the engine to various accessories. It is part of the engine’s drive system and interacts with components such as the alternator, water pump, and air conditioning compressor. The gear ensures these accessories receive the necessary power to operate efficiently ¹.

Purpose of Accessory Drive Gear 3928861

The Accessory Drive Gear 3928861 plays a role in the operation of a truck by driving various engine accessories. It is responsible for transferring power from the engine to components like the alternator, which generates electricity, and the water pump, which circulates coolant. This gear ensures that these accessories operate in sync with the engine, contributing to the overall performance and reliability of the truck ².

Key Features

The Accessory Drive Gear 3928861 is characterized by several features that enhance its performance and durability. It is made from high-quality materials that resist wear and tear, ensuring longevity. The design specifications of this gear are tailored to fit seamlessly within Cummins engines, promoting efficient power transfer. Additionally, it may include unique attributes such as noise reduction features or enhanced tooth profiles for better engagement with driven components ³.

Benefits

The Accessory Drive Gear 3928861 offers several advantages. It contributes to improved engine efficiency by ensuring that accessories receive consistent power. The gear’s reliable performance enhances the overall reliability of the truck’s engine system. Furthermore, its compatibility with Cummins engines ensures that it integrates smoothly into the engine system, maintaining optimal performance.

Installation and Integration

Proper installation of the Accessory Drive Gear 3928861 is vital for its effective operation. It should be installed according to the manufacturer’s guidelines to ensure it fits correctly within the engine system. Specific considerations may include aligning the gear with other components and ensuring it is securely fastened. Integration into the engine system requires attention to detail to avoid issues such as misalignment or improper tension, which could affect performance.

Troubleshooting and Maintenance

Identifying common issues with the Accessory Drive Gear 3928861 involves monitoring for signs of wear, such as noise or vibration, which may indicate problems. Diagnostic procedures should include checking for proper alignment and tension. Maintenance practices to ensure optimal performance include regular inspection for wear and tear, lubrication as per the manufacturer’s recommendations, and timely replacement of the gear if significant wear is detected.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a strong reputation in the commercial truck industry for producing reliable and high-performance engines. The company’s product range includes a variety of engines and components designed to meet the demanding requirements of commercial vehicles.

Compatibility with Cummins Engines

The Accessory Drive Gear part number 3928861 is designed to fit seamlessly with a range of Cummins engines. This part is integral to the engine’s accessory drive system, ensuring the proper functioning of various engine components.

For the 4B3.9 and 6B5.9 engines, the Accessory Drive Gear part 3928861 is engineered to interface with the engine’s belt-driven accessories, such as the alternator, water pump, and air conditioning compressor. Its precision design ensures optimal performance and longevity of these critical components.

In the case of the B5.9 G engine, the Accessory Drive Gear part 3928861 is specifically tailored to the unique layout and accessory requirements of this engine model. It ensures that the engine’s accessories operate efficiently and reliably.

The ISB CM550 engine also benefits from the Accessory Drive Gear part 3928861, which is designed to work with the engine’s belt-driven accessories, maintaining the balance and efficiency of the engine’s operation.

For the QSB5.9 44 CM550 engine, the Accessory Drive Gear part 3928861 is crafted to meet the specific demands of this engine’s accessory system. It ensures that all belt-driven components function correctly, contributing to the overall performance and durability of the engine.

Understanding the Role of Accessory Drive Gear 3928861 in Engine Systems

The Accessory Drive Gear 3928861 is an integral component in the efficient operation of various engine systems. It facilitates the transfer of mechanical power from the engine’s crankshaft to several auxiliary components, ensuring they function harmoniously.

Air Compressor

In systems equipped with an air compressor, the Accessory Drive Gear 3928861 is responsible for transmitting power to compress air. This compressed air is essential for various functions, including operating pneumatic tools and maintaining pressure in air suspension systems. The seamless transfer of power ensures consistent performance and reliability of the air compressor.

Front Gear Train Accessory Drive

The front gear train accessory drive system relies on the Accessory Drive Gear 3928861 to distribute power to multiple components located at the front of the engine. This system typically includes components such as the alternator, power steering pump, and air conditioning compressor. The Accessory Drive Gear 3928861 ensures that each component receives the necessary power to operate efficiently, contributing to the overall performance and durability of the engine.

Hydraulic Pump Drive

For engines incorporating a hydraulic pump, the Accessory Drive Gear 3928861 plays a significant role in powering the pump. The hydraulic pump is responsible for generating hydraulic pressure, which is used to operate various systems such as power brakes, steering, and suspension. The consistent and reliable transfer of power by the Accessory Drive Gear 3928861 is essential for the hydraulic pump to maintain optimal pressure levels and ensure the smooth operation of these systems.

Vacuum Pump

In engines that utilize a vacuum pump, the Accessory Drive Gear 3928861 is tasked with providing the necessary power to create and maintain vacuum pressure. This vacuum pressure is vital for various functions, including operating brake boosters, emission control systems, and certain types of fuel injection systems. The Accessory Drive Gear 3928861 ensures that the vacuum pump operates efficiently, contributing to the engine’s overall performance and efficiency.

Conclusion

Overall, the Accessory Drive Gear 3928861 is a key component in the engine’s accessory drive system, ensuring that power is efficiently distributed to various auxiliary components. Its role in facilitating the operation of these components is essential for the engine’s performance, reliability, and longevity.