3939710
V Ribbed Belt
Cummins®

The Cummins 3939710 V Ribbed Belt is a component designed for use in commercial trucks. It serves a significant role in the operation of these vehicles by facilitating the transfer of power from the engine to various auxiliary components. Understanding its purpose and functionality is key to maintaining the efficiency and reliability of truck operations ³.

Basic Concepts of V Ribbed Belts

V Ribbed Belts are characterized by their trapezoidal cross-section, which allows them to fit snugly into corresponding pulleys. This design enhances grip and reduces slippage, ensuring efficient power transmission. Unlike flat belts, V Ribbed Belts can transmit more power and operate at higher speeds with less risk of slipping. They are also more compact, allowing for more components to be driven by a single belt ¹.

Purpose of the 3939710 V Ribbed Belt

The 3939710 V Ribbed Belt plays a role in the operation of a truck by driving several key components. It is responsible for powering the alternator, water pump, power steering pump, and other auxiliary systems. By ensuring these components receive the necessary power, the belt supports the overall functionality and performance of the truck ³.

Key Features

The 3939710 V Ribbed Belt is constructed from high-quality materials, featuring a robust rib design that enhances its durability and performance. Its material composition is tailored to withstand the rigors of commercial truck operation, providing resistance to heat, oil, and abrasion. The unique attributes of this belt, such as its precise rib alignment and tension maintenance capabilities, contribute to its efficiency and longevity ².

Benefits

Utilizing the 3939710 V Ribbed Belt offers several advantages. It contributes to improved engine efficiency by ensuring consistent power transmission to auxiliary components. Additionally, its design reduces the need for frequent maintenance, offering enhanced reliability. The belt’s durability and performance characteristics also contribute to the overall efficiency and uptime of commercial trucks ³.

Installation Considerations

When installing the 3939710 V Ribbed Belt, it is important to follow guidelines and best practices to ensure optimal performance. This includes proper tensioning procedures to avoid over or under-tensioning, which can lead to premature wear or slippage. Alignment checks are also crucial to ensure the belt runs true on all pulleys, preventing unnecessary stress and ensuring efficient operation ¹.

Troubleshooting Common Issues

Common problems associated with V Ribbed Belts include slippage, wear, and noise. Slippage can often be addressed by re-tensioning the belt or inspecting for pulley misalignment. Wear may indicate the need for replacement, while noise could signal misalignment or a failing belt. Regular inspections and maintenance can help identify and resolve these issues before they lead to more significant problems ².

Maintenance Tips

To prolong the life of the 3939710 V Ribbed Belt, regular maintenance practices are recommended. This includes periodic inspections for signs of wear or damage, cleaning the belt and pulleys to remove debris, and following manufacturer guidelines for replacement intervals. Adhering to these practices can help maintain the belt’s performance and extend its service life ³.

Cummins Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its wide range of products and strong reputation for quality and reliability. With a history of innovation and commitment to customer satisfaction, Cummins continues to be a trusted name in the industry, providing solutions that enhance the performance and efficiency of commercial vehicles ³.

V Ribbed Belt 3939710 Compatibility with Cummins Engines

The V Ribbed Belt part number 3939710, manufactured by Cummins, is designed to fit a variety of Cummins engines. This belt is integral for the proper functioning of engine accessories such as the alternator, water pump, and air conditioning compressor. Below is a detailed overview of the engines with which this belt is compatible:

4B3.9 and 6B5.9 Engines

The V Ribbed Belt 3939710 is compatible with the 4B3.9 and 6B5.9 engines. These engines are known for their robust performance and reliability, often used in heavy-duty applications. The belt ensures smooth operation of the engine accessories, maintaining efficiency and longevity of the engine components ³.

6C8.3 and ISB CM550 Engines

The 6C8.3 and ISB CM550 engines also utilize the V Ribbed Belt 3939710. These engines are part of Cummins’ lineup of medium-duty engines, providing a balance of power and fuel efficiency. The belt’s design ensures it can handle the specific demands of these engines, contributing to their overall performance ³.

ISC CM554 and ISL CM554 Engines

The ISC CM554 and ISL CM554 engines are designed for both on-highway and off-highway applications. The V Ribbed Belt 3939710 is engineered to fit these engines, ensuring the accessories are driven efficiently. This compatibility is crucial for maintaining the operational integrity of these engines in various demanding environments ³.

QSB4.5 CM2250 EC, QSB4.5 CM850 (CM2850), and QSB5.9 44 CM550 Engines

The V Ribbed Belt 3939710 is also suitable for the QSB4.5 CM2250 EC, QSB4.5 CM850 (CM2850), and QSB5.9 44 CM550 engines. These engines are part of Cummins’ QSB series, known for their versatility and durability in agricultural and industrial applications. The belt’s design ensures it can withstand the operational stresses of these engines, providing reliable performance ³.

QSB6.7 CM850 (CM2850) and QSB7 CM2880 B117 Engines

Lastly, the V Ribbed Belt 3939710 fits the QSB6.7 CM850 (CM2850) and QSB7 CM2880 B117 engines. These engines are designed for heavy-duty applications, requiring a belt that can handle high loads and maintain consistent performance. The belt’s compatibility with these engines ensures that the engine accessories are driven effectively, contributing to the overall efficiency and reliability of the engine ³.

Role of Part 3939710 V Ribbed Belt in Engine Systems

The V Ribbed Belt, identified by part number 3939710, is an integral component in the efficient operation of various engine systems. Its primary function is to transmit power from the engine’s crankshaft to multiple auxiliary components through a series of pulleys ¹.

Power Transmission to Auxiliary Components

1. Alternator Drive: The V Ribbed Belt is routed around the alternator pulley. This connection ensures that the alternator receives the necessary rotational force to generate electricity, which is vital for powering the vehicle’s electrical systems and recharging the battery.

2. Water Pump Drive: Another significant application of the V Ribbed Belt is its connection to the water pump pulley. This setup allows the belt to drive the water pump, which circulates coolant through the engine. Proper coolant circulation is essential for maintaining optimal engine temperature and preventing overheating.

3. Additional Pulleys: The V Ribbed Belt may also engage with other pulleys connected to components such as the power steering pump or air conditioning compressor. Each of these pulleys relies on the consistent power transmission provided by the belt to function correctly.

Integration and Functionality

The V Ribbed Belt’s design, with its multiple ribs, allows it to handle higher loads and transmit more power efficiently than traditional flat belts. This efficiency is crucial for modern engines that often have multiple auxiliary components requiring simultaneous power ².

Conclusion

In summary, the V Ribbed Belt (part 3939710) plays a significant role in ensuring that essential engine components receive the power they need to operate. Its reliable performance is key to the overall functionality and efficiency of the engine system ³.