4930839
Belt Tensioner Support
Cummins®

Introduction

The Belt Tensioner Support 4930839, manufactured by Cummins, is a critical component in the engine systems of heavy-duty trucks. This part ensures the proper tension of the belts that drive various engine accessories, contributing to the efficient and reliable operation of the engine system.

Basic Concepts of Belt Tensioner Support

A Belt Tensioner Support is designed to maintain the correct tension in the belts of an engine’s accessory drive system. It automatically adjusts the tension on the belt as the engine operates, which is essential for the efficient and reliable operation of engine accessories such as the alternator, water pump, and air conditioning compressor ¹. Proper belt tension prevents slippage, reduces wear, and ensures the smooth operation of these accessories.

Purpose of Belt Tensioner Support 4930839

The Belt Tensioner Support 4930839 maintains optimal tension in the engine’s accessory drive belts, ensuring they remain properly aligned and do not slip. This contributes to the overall efficiency and reliability of the engine system by preventing inefficient operation of the accessories they drive ².

Key Features

This Cummins part is constructed from high-quality materials resistant to wear and corrosion, ensuring long-lasting operation in the demanding environment of a truck engine. It includes precision-machined components for smooth operation and accurate tension adjustment. Additionally, it may feature a self-adjusting mechanism that maintains the correct belt tension under varying engine conditions ³.

Benefits

The Belt Tensioner Support 4930839 improves engine efficiency, reduces belt wear, and enhances the reliability of the accessory drive system. This leads to longer belt life, reduced maintenance requirements, and more consistent performance from engine accessories.

Installation and Compatibility

Proper installation of the Belt Tensioner Support 4930839 is essential for its effective operation. Installation guidelines should be followed to ensure correct positioning and securing. Compatibility with specific truck models and engine types should be verified to ensure optimal performance and longevity.

Troubleshooting and Maintenance

Regular maintenance and troubleshooting are important for the longevity and optimal performance of the Belt Tensioner Support 4930839. Common issues may include signs of wear, such as noise from the tensioner or visible damage to the belt. Regular inspection and maintenance can help identify these issues early, allowing for timely replacement or repair.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong reputation in the automotive industry, Cummins is committed to producing high-quality engine components and systems that meet the demanding requirements of heavy-duty applications.

Compatibility with Cummins Engines

The Belt Tensioner Support 4930839 is compatible with a range of Cummins engines, including the 4B3.9, 6B5.9, B5.9, QSB3.9, and QSB5.9 series. This part ensures the proper tension of the engine’s serpentine belt, contributing to the efficient operation and longevity of the belt and related components.

Role of Part 4930839 Belt Tensioner Support in Engine Systems

The Belt Tensioner Support, identified by part number 4930839, is integral to the efficient operation of several key components within an engine system. It ensures that the belt, which drives various engine accessories, maintains the correct tension. Proper tension is essential for the reliable transfer of power and the smooth operation of these accessories.

Interaction with the Drive Belt

The drive belt transfers rotational force from the crankshaft to various engine components. The Belt Tensioner Support holds the tensioner in place, allowing it to apply the necessary force to the belt. This ensures that the belt does not slip or become too tight, which could lead to inefficient operation or damage to the belt and other components.

Supporting the Alternator

The alternator generates electricity to power the vehicle’s electrical systems and recharge the battery. The drive belt connects the alternator to the engine’s crankshaft. The Belt Tensioner Support maintains the correct tension on the belt, ensuring that the alternator receives consistent power transfer. This consistency is necessary for the alternator to function effectively and provide a stable electrical supply.

Coordination with the Tensioner

The tensioner automatically adjusts the tension of the belt as it wears or stretches over time. The Belt Tensioner Support provides a stable mounting point for the tensioner, allowing it to move freely and make the necessary adjustments. This dynamic interaction between the support and the tensioner ensures that the belt remains at the optimal tension, enhancing the durability and performance of the belt and the driven components.

Ensuring Belt Longevity

By maintaining the correct tension, the Belt Tensioner Support contributes to the longevity of the drive belt. A belt that is either too loose or too tight can wear out prematurely, leading to potential breakdowns and the need for repairs. The support ensures that the tensioner can make real-time adjustments, prolonging the life of the belt and reducing maintenance requirements.

Conclusion

The Belt Tensioner Support 4930839 is a key component in the engine system, facilitating the efficient and reliable operation of the drive belt, alternator, and tensioner. Its role in maintaining proper belt tension is essential for the overall performance and durability of the engine’s accessory drive system.