4990977
V Ribbed Belt
Cummins®

Introduction

The Cummins 4990977 V-Ribbed Belt is a component designed for use in commercial trucks. It facilitates the transfer of power from the engine to various accessories, ensuring the smooth and efficient operation of these vehicles. This belt is integral to maintaining the functionality of critical systems within the truck.

Basic Concepts of V-Ribbed Belts

V-Ribbed Belts are characterized by their trapezoidal cross-section, which allows them to fit into corresponding grooves on pulleys. This design enhances grip and reduces slippage, making them efficient for transmitting power in automotive applications ¹. Unlike flat belts, V-Ribbed Belts offer greater durability and can handle higher loads. They are commonly used in the drivetrain of trucks to power accessories such as alternators, water pumps, and air conditioning compressors.

Purpose of the 4990977 V-Ribbed Belt

This Cummins part plays a role in the operation of a truck by driving various engine accessories. It connects the crankshaft to components like the alternator, water pump, and power steering pump, ensuring these systems receive the necessary power to function. This belt is essential for maintaining the operational integrity of the truck’s engine and accessory systems.

Key Features

The 4990977 V-Ribbed Belt is constructed with high-quality materials to ensure durability and performance. It features a robust rubber compound for the belt body, providing flexibility and resistance to wear. The belt’s design includes multiple ribs that enhance its grip on pulleys, reducing the likelihood of slippage. Additionally, it is engineered to withstand the high temperatures and dynamic loads typical in commercial truck environments.

Benefits

Using the 4990977 V-Ribbed Belt offers several advantages. It contributes to improved efficiency in power transmission, reducing the load on the engine. The belt’s design and materials result in reduced maintenance requirements, as it is built to last under demanding conditions. Furthermore, its reliable performance enhances the overall reliability of the truck’s engine and accessory systems.

Installation

When installing the 4990977 V-Ribbed Belt, it is important to follow guidelines and best practices to ensure proper fit and function. This includes routing the belt correctly around all pulleys and ensuring it is tensioned to the manufacturer’s specifications. Specific considerations may include the alignment of belt tensioners and the use of appropriate tools to avoid damage to the belt or pulleys.

Troubleshooting

Common issues with the 4990977 V-Ribbed Belt may include slippage, cracking, or fraying. To diagnose these problems, one should inspect the belt for signs of wear, check the tension, and ensure proper alignment on the pulleys. Addressing these issues promptly can prevent more significant problems and maintain the efficiency of the truck’s engine accessories.

Maintenance

To ensure optimal performance and longevity of the 4990977 V-Ribbed Belt, regular maintenance practices are recommended. This includes periodic inspections for wear and damage, checking tension levels, and replacing the belt according to the manufacturer’s guidelines or when signs of significant wear are observed. Proper maintenance helps to avoid unexpected failures and ensures the continued reliable operation of the truck.

Cummins Overview

Cummins is a well-established manufacturer in the commercial truck industry, known for its wide range of engines and components. With a history of innovation and quality, Cummins products are designed to meet the demanding requirements of commercial vehicle applications. The company’s reputation for reliability and performance makes its components, like the 4990977 V-Ribbed Belt, a preferred choice for truck operators and maintenance professionals.

V-Ribbed Belt 4990977 Compatibility with Cummins Engines

The V-Ribbed Belt part number 4990977, manufactured by Cummins, is designed to fit a variety of Cummins engines. This belt is crucial for the proper functioning of the engine’s ancillary components, ensuring that systems like the alternator, water pump, and air conditioning compressor operate efficiently.

ISB/ISD Series Engines

• ISB/ISD 4.5 CM2150 B119
• ISB/ISD 6.7 CM2150 SN

The V-Ribbed Belt 4990977 is compatible with both the ISB/ISD 4.5 and ISB/ISD 6.7 engines. These engines are part of the CM2150 series, which are known for their robust performance and reliability in various applications, from heavy-duty trucks to industrial machinery.

ISBE Series Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

The ISBE series engines, including the CM2150, CM800, and CM850, also utilize the V-Ribbed Belt 4990977. These engines are typically found in on-highway and vocational applications, providing a balance of power and efficiency.

QSB Series Engines

• QSB 4.5 CM850 (CM2850)
• QSB 6.7 CM850 (CM2850)

The QSB series engines, both the 4.5 and 6.7 variants, are compatible with the V-Ribbed Belt 4990977. These engines are often used in off-highway applications, such as construction and agricultural equipment, where durability and performance are paramount.

This belt is engineered to withstand the rigors of these demanding environments, ensuring longevity and consistent performance across the various engine models.

Role of Part 4990977 V-Ribbed Belt in Engine Systems

The part 4990977 V-Ribbed Belt is integral to the efficient operation of various engine components, ensuring they function in harmony. One of its primary roles is in the Water Pump Drive system.

In this system, the V-Ribbed Belt transfers rotational force from the engine’s crankshaft to the water pump. This transfer is essential for the circulation of coolant throughout the engine. As the belt drives the water pump, coolant is pumped through the engine block, absorbing heat generated by combustion. The heated coolant then travels to the radiator, where it releases the absorbed heat and cools down before returning to the engine. This continuous cycle helps maintain optimal engine temperature, preventing overheating and ensuring consistent performance ².

The V-Ribbed Belt’s design, with its multiple ribs, allows it to handle higher loads and transmit more power compared to traditional flat belts. This makes it well-suited for driving not only the water pump but also other auxiliary components such as the alternator, power steering pump, and air conditioning compressor. Each of these components relies on the consistent and reliable power transmission provided by the V-Ribbed Belt to function correctly.

Conclusion

The Cummins 4990977 V-Ribbed Belt is a critical component in the operation of commercial trucks, ensuring the efficient transfer of power to essential engine accessories. Its robust design, compatibility with various Cummins engines, and role in maintaining engine temperature and accessory functionality make it a vital part of the truck’s drivetrain system. Regular maintenance and proper installation are key to ensuring the longevity and reliability of this part.