3960345
Accessory Drive Gear
Cummins®

The Accessory Drive Gear 3960345, manufactured by Cummins, is a component designed for use in commercial trucks. It serves a specific function within the engine system, contributing to the overall operation and efficiency of the vehicle. Cummins, a well-established manufacturer in the automotive industry, is known for producing reliable and high-quality components ¹.

Basic Concepts of Accessory Drive Gear

An Accessory Drive Gear is a mechanical component that facilitates the transfer of power from the engine to various auxiliary systems within a vehicle. It operates on the principle of gear mechanics, where rotational force is transmitted through interlocking teeth. This gear interacts with other components such as belts, pulleys, and the crankshaft to drive systems like the alternator, water pump, and air conditioning compressor ².

Purpose of Accessory Drive Gear 3960345

This Cummins part plays a role in the operation of a truck by ensuring the efficient transfer of power to essential auxiliary systems. Its design and construction contribute to the smooth and reliable performance of these systems, which in turn supports the overall efficiency and functionality of the engine.

Key Features

The Accessory Drive Gear 3960345 is characterized by several key features that enhance its functionality. These include a precision-machined gear tooth profile for optimal power transmission, durable materials resistant to wear and corrosion, and a design that ensures quiet operation and minimal vibration. These features collectively contribute to the gear’s reliability and longevity ³.

Benefits

Utilizing the Accessory Drive Gear 3960345 offers several advantages. It contributes to improved engine performance through efficient power transmission to auxiliary systems. Its durable construction enhances the reliability of these systems, reducing the likelihood of unexpected failures. Additionally, the gear’s design can lead to lower maintenance and operational costs over time.

Installation Process

Installing the Accessory Drive Gear 3960345 involves several steps to ensure proper integration with the engine system. The process includes preparing the engine compartment, aligning the gear with the crankshaft, securing it in place, and verifying the alignment and tension of the drive belt. Specific tools may be required to facilitate a precise and secure installation.

Troubleshooting

Common issues with Accessory Drive Gears can include noise, vibration, or a decrease in the performance of driven systems. Identifying these issues often involves listening for unusual sounds, feeling for excessive vibration, or noticing a decline in system efficiency. Solutions may range from adjusting the gear alignment to replacing worn components.

Maintenance Tips

Regular maintenance of the Accessory Drive Gear 3960345 is vital for ensuring its longevity and optimal performance. This includes periodic inspections for signs of wear or damage, checking the alignment and tension of the drive belt, and cleaning the gear and surrounding components to prevent the buildup of debris. Adhering to a maintenance schedule can help prevent issues and extend the life of the gear.

Compatibility and Applications

The Accessory Drive Gear 3960345 is designed for use in specific types of trucks and engines, catering to various commercial truck applications. Its compatibility ensures that it can effectively integrate into different engine systems, providing reliable power transmission to auxiliary systems across a range of commercial vehicle settings.

Cummins Overview

Cummins has a long-standing reputation in the automotive industry for manufacturing high-quality components. The company’s commitment to innovation and quality is evident in its product line, which includes a variety of engine parts and accessories designed to enhance vehicle performance and reliability. Cummins’ expertise and dedication to excellence make it a trusted name in the industry.

Accessory Drive Gear 3960345 Compatibility with Cummins Engines

This part is designed to fit a variety of Cummins engines. It plays a role in the engine’s operation by driving various accessories such as the alternator, water pump, and air conditioning compressor.

Compatible Engines

• 4B3.9
• 6B5.9
• B5.9 CM2670 B166C
• B5.9 GAS PLUS CM556
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• QSB3.9 CM2880 B138
• QSB5.9 CM2880 B139

Grouping of Compatible Engines

The Accessory Drive Gear 3960345 is compatible with both the 3.9L and 5.9L engine variants. Here is a breakdown of the compatibility:

• 3.9L Engines:

  • 4B3.9
  • ISB3.9 CM2220 B107
  • QSB3.9 CM2880 B138

• 5.9L Engines:

  • 6B5.9
  • B5.9 CM2670 B166C
  • B5.9 GAS PLUS CM556
  • ISB5.9 CM2880 B127
  • QSB5.9 CM2880 B139

This part is engineered to ensure a precise fit and reliable performance across these engine models, facilitating the smooth operation of essential engine accessories.

Role of Accessory Drive Gear in Engine Systems

The Accessory Drive Gear, identified by part number 3960345, is an integral component in the efficient operation of various engine systems. It facilitates the transfer of mechanical power from the engine to auxiliary components, ensuring they function seamlessly.

Compressor Systems

In compressor systems, the Accessory Drive Gear is responsible for transmitting power from the engine to the compressor. This gear ensures that the compressor operates at the optimal speed, allowing for efficient air compression. Proper engagement of the gear is essential for maintaining the desired pressure levels within the system, which is vital for the overall performance of the engine.

Air Systems

For air systems, the Accessory Drive Gear plays a significant role in driving components such as air pumps and blowers. These systems rely on consistent and reliable power transmission to ensure that air is circulated effectively throughout the engine and its surroundings. The gear’s precise operation helps in maintaining the correct airflow, which is necessary for cooling and other air-dependent functions within the engine.

Installation Kits

When it comes to engine installation kits, the Accessory Drive Gear is often included to simplify the process of integrating auxiliary components with the engine. This gear ensures that all connected accessories receive the necessary power to function correctly during and after installation. Its inclusion in the kit highlights the importance of having a reliable drive mechanism to support the engine’s auxiliary systems.

Engine Installation

During engine installation, the Accessory Drive Gear is a key component that connects the engine to various accessories. It ensures that as the engine runs, power is efficiently distributed to components such as the alternator, water pump, and power steering pump. This reliable power transmission is essential for the smooth operation of these accessories, contributing to the engine’s overall efficiency and performance.

Conclusion

The Accessory Drive Gear 3960345 is a critical component in the efficient operation of commercial truck engines. Its role in transferring power to auxiliary systems, combined with its durable construction and precise engineering, ensures reliable performance and longevity. Regular maintenance and proper installation are essential to maximize the benefits of this Cummins part, contributing to the overall efficiency and reliability of the engine system.