4900783
Captive Washer Cap Screw
Cummins®

The 4900783 Captive Washer Cap Screw is a specialized fastener produced by Cummins, a well-established manufacturer in the automotive and heavy-duty truck industry. This component is integral to the assembly and maintenance of heavy-duty trucks, ensuring secure and reliable connections within the vehicle’s structure and systems.

Basic Concepts of Captive Washer Cap Screws

A captive washer cap screw is a type of fastener that includes an integrated washer, which remains attached to the screw during installation. This design simplifies the assembly process by reducing the number of components required and minimizing the risk of losing the washer. Captive washer cap screws are commonly used in mechanical assemblies where consistent and secure fastening is necessary ¹.

Purpose of the 4900783 Captive Washer Cap Screw

The 4900783 Captive Washer Cap Screw is designed to play a specific role in the operation and maintenance of heavy-duty trucks. It is utilized in various application areas within the truck’s structure and systems, providing secure fastening for components that are subject to significant stress and vibration. This screw ensures that critical connections remain intact, contributing to the overall reliability and safety of the vehicle ².

Key Features

The 4900783 Captive Washer Cap Screw boasts several primary characteristics that enhance its functionality and durability. Its design includes an integrated washer, which simplifies installation and ensures a consistent load distribution. The screw is made from high-quality materials, providing resistance to corrosion and wear. Additionally, its unique attributes, such as a specific thread pitch and head design, contribute to its effectiveness in heavy-duty applications ³.

Benefits

Using the 4900783 Captive Washer Cap Screw in truck maintenance and assembly offers several advantages. The integrated washer design improves reliability by ensuring that the washer remains in place during installation. This feature also simplifies the installation process, reducing the time and effort required. Furthermore, the screw’s durable construction and precise design contribute to enhanced performance and longevity in demanding applications.

Installation Process

To install the 4900783 Captive Washer Cap Screw, follow these steps:

1. Ensure the mating surfaces are clean and free of debris.
2. Align the screw with the designated hole.
3. Use a suitable torque wrench to tighten the screw to the manufacturer’s specified torque settings.
4. Verify that the screw is securely fastened and that the integrated washer is properly seated.

Required tools may include a torque wrench and a socket or screwdriver compatible with the screw’s head design.

Troubleshooting and Maintenance

Common issues associated with captive washer cap screws include loosening due to vibration and corrosion. To address these problems, regularly inspect the screws for signs of wear or damage. If loosening is detected, re-tighten the screw to the specified torque settings. To prevent corrosion, apply a suitable anti-corrosion coating or lubricant. Maintaining the screws in this manner will ensure their longevity and optimal performance.

Cummins: Manufacturer 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 strong reputation for quality and innovation in the automotive and heavy-duty truck industry. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications.

Captive Washer Cap Screw (Part 4900783) in Cummins Engines

The Captive Washer Cap Screw, identified by the part number 4900783, is a critical component in the assembly of various Cummins engines. This part is designed to secure different engine components together, ensuring stability and reliability during operation.

In the A1400 and A1700 engines, the 4900783 part is utilized in several key areas. It is often found in the engine’s mounting system, where it helps to affix the engine to the vehicle’s chassis. Additionally, it plays a role in securing the engine’s internal components, such as the cylinder head and various engine blocks, ensuring that they remain tightly fastened and aligned.

For the A2000 and A2300 engines, the 4900783 part is similarly essential. In these engines, it is frequently used in the transmission and drivetrain assemblies, where it helps to secure the transmission housing and other related components. This ensures that the drivetrain operates smoothly and efficiently, with minimal risk of loosening or misalignment.

Overall, the Captive Washer Cap Screw is a vital component in maintaining the integrity and performance of Cummins engines. Its use across various models highlights its importance in ensuring that the engine operates reliably and efficiently.

Role of Part 4900783 Captive Washer Cap Screw in Engine Systems

In the intricate assembly of engine systems, the 4900783 Captive Washer Cap Screw plays a significant role in ensuring the structural integrity and efficient operation of various components. This screw is instrumental in the secure attachment and alignment of parts, contributing to the overall performance and reliability of the engine.

Integration with the Block

The engine block, a fundamental component that houses the cylinders and forms the structure of the engine, relies on the 4900783 Captive Washer Cap Screw for several key functions. These screws are used to fasten various plates, brackets, and sensors to the block. By providing a secure and stable connection, they help maintain the precise alignment of these components, which is essential for the engine’s operational efficiency. Additionally, the captive washer design ensures that the screw remains in place during maintenance or repairs, reducing the risk of loss and ensuring quick reassembly.

Contribution to Cylinder Assembly

In the cylinder assembly, the 4900783 Captive Washer Cap Screw is utilized to attach components such as cylinder head covers, valve covers, and other ancillary parts. These screws ensure that the cylinder components are held firmly in place, which is vital for maintaining the seal and preventing leaks. The captive washer feature enhances the screw’s ability to withstand vibrations and thermal expansions, common in engine operations, thereby prolonging the lifespan of the cylinder assembly.

Support for the Cylinder Block

The cylinder block, which integrates the cylinders, pistons, and crankshaft, depends on the 4900783 Captive Washer Cap Screw for the secure attachment of external components. These screws are often used to mount accessories like the oil pump, fuel injectors, and various sensors. Their robust design ensures that these critical components remain firmly attached, even under the high stresses and vibrations experienced during engine operation. This stability is essential for the accurate functioning of these components, directly influencing the engine’s performance and durability.

Conclusion

In summary, the 4900783 Captive Washer Cap Screw is a vital element in the assembly and maintenance of engine systems. Its application across the block, cylinder, and cylinder block ensures that all components are securely fastened, aligned, and capable of withstanding the demanding conditions of engine operation.