4940870
V Ribbed Belt
Cummins®

The Cummins 4940870 V-Ribbed Drive Belt is a critical component in the operation of commercial trucks, designed to transfer power from the engine to various auxiliary components, ensuring their efficient and reliable function ¹.

Basic Concepts of V-Ribbed Drive Belts

V-Ribbed Drive Belts, characterized by their trapezoidal cross-section, offer superior grip and reduced slippage compared to flat belts, enhancing power transmission efficiency ². Constructed from durable materials, these belts are engineered to withstand continuous operation within an engine system, driving components such as the alternator, water pump, and air conditioning compressor.

Role of the 4940870 V-Ribbed Drive Belt in Truck Operation

This Cummins part connects the crankshaft to various engine accessories, facilitating the transfer of rotational force. This interaction is vital for maintaining the truck’s overall performance, ensuring that essential systems like the charging and cooling systems operate efficiently ³.

Key Features of the 4940870 V-Ribbed Drive Belt

The 4940870 V-Ribbed Drive Belt is composed of synthetic rubber and high-tensile textile cords, contributing to its durability and flexibility. Design enhancements such as optimized rib profiles and advanced tensioning systems distinguish this belt, offering improved performance and longevity compared to standard drive belts ⁴.

Benefits of Using the 4940870 V-Ribbed Drive Belt

Utilizing this part offers advantages such as improved efficiency in power transmission, reduced energy loss, enhanced engine performance, and a longer service life, minimizing the need for frequent replacements. Its reliability under various operating conditions makes it a preferred choice for commercial truck applications.

Installation and Maintenance Guidelines

Proper installation of the 4940870 V-Ribbed Drive Belt is crucial for optimal performance. It should be routed according to the manufacturer’s specifications, with attention to tension and alignment. Routine maintenance involves regular inspections for signs of wear and ensuring the belt remains properly tensioned, which helps maintain its efficiency and extends its service life.

Troubleshooting Common Issues

Common problems with V-Ribbed Drive Belts include slippage, cracking, and premature wear. Slippage can often be addressed by adjusting the belt tension or inspecting the pulleys for damage. Cracking may indicate material fatigue, necessitating belt replacement. Premature wear could be a sign of misalignment or excessive tension, both of which require adjustment to prevent further damage.

Cummins: A Brief 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 reputation for quality and innovation within the automotive industry. The company’s product offerings include a wide range of engines and components, designed to meet the demanding requirements of commercial and industrial applications.

V-Ribbed Drive Belt (Part 4940870) Compatibility with Cummins Engines

The V-Ribbed Drive Belt (Part 4940870) manufactured by Cummins is designed to fit seamlessly with several of their engine models. This belt is crucial for the proper functioning of engine accessories, ensuring that components such as the alternator, water pump, and air conditioning compressor operate efficiently.

QSB6.7 CM850 (CM2850) Engines

The V-Ribbed Drive Belt (Part 4940870) is compatible with the QSB6.7 CM850 (CM2850) engines. This belt is engineered to handle the specific demands of these engines, providing reliable power transmission and maintaining the necessary tension to prevent slippage. Its design ensures that the belt can withstand the operational stresses and temperatures associated with these engines.

QSB7 CM2880 B117 Engines

Similarly, the V-Ribbed Drive Belt (Part 4940870) is also suitable for the QSB7 CM2880 B117 engines. This belt is crafted to integrate smoothly with the engine’s layout, ensuring that all driven components receive the power they need. The belt’s robust construction and precise dimensions make it an ideal choice for these engines, contributing to their overall performance and longevity.

Compatibility Summary

The V-Ribbed Drive Belt (Part 4940870) is a versatile component that fits both the QSB6.7 CM850 (CM2850) and QSB7 CM2880 B117 engines. Its compatibility with these engines underscores its importance in maintaining the operational efficiency of various engine accessories. This belt’s design and material ensure it can meet the rigorous demands of these engines, providing a reliable solution for power transmission.

Role of Part 4940870 V-Ribbed Drive Belt in Engine Systems

The V-Ribbed Drive Belt, identified by part number 4940870, is integral to the efficient operation of various engine components. It is primarily responsible for transmitting power from the engine’s crankshaft to auxiliary components, ensuring they function in harmony with the engine’s operation.

Drive Mechanism

In the context of the drive mechanism, the V-Ribbed Drive Belt facilitates the transfer of rotational force from the crankshaft to other engine accessories. This belt is designed to engage with multiple pulleys, each connected to different components requiring driven power. The consistent and reliable transmission of this power is essential for the smooth operation of these accessories, which include but are not limited to, the alternator, power steering pump, and air conditioning compressor. The belt’s ribbed design enhances its grip on the pulleys, reducing slippage and ensuring a steady power transfer, which is vital for the efficient functioning of these driven components.

Fan Operation

The V-Ribbed Drive Belt also plays a significant role in the operation of the engine cooling fan. Connected to the engine’s crankshaft via the belt, the fan is activated as the engine runs, ensuring a continuous flow of air through the radiator. This airflow is essential for dissipating heat generated by the engine, maintaining optimal operating temperatures, and preventing overheating. The belt’s durability and flexibility are paramount in withstanding the constant motion and tension required for fan operation, especially under varying engine loads and speeds.

Conclusion

In summary, the V-Ribbed Drive Belt (part 4940870) is a fundamental component in the engine system, ensuring the seamless operation of driven accessories and maintaining engine cooling efficiency. Its design and functionality are tailored to meet the demands of modern engine systems, contributing to overall engine performance and reliability.