3012479
Captive Washer Cap Screw
Cummins®

The Captive Washer Cap Screw 3012479, manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. Cummins, a well-established name in the commercial truck industry, produces a range of components that enhance the performance and reliability of heavy-duty vehicles. This Cummins part plays a significant role in the assembly and maintenance of commercial trucks.

Basic Concepts of Captive Washer Cap Screws

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which is held in place by a collar or step on the screw’s shank. This design ensures that the washer remains attached to the screw, reducing the risk of loss during installation and providing consistent pressure distribution across the fastened components. Captive Washer Cap Screws are commonly used in mechanical assemblies where vibration resistance and secure fastening are required ¹.

Purpose of the 3012479 Captive Washer Cap Screw in Truck Operations

This part is utilized in commercial trucks to secure various components, ensuring structural integrity and reliable performance. It is particularly effective in applications where components are subject to vibration, as the integrated washer helps maintain consistent pressure and reduces the likelihood of loosening. This screw is often used in the assembly of engine components, chassis parts, and other critical areas where secure fastening is necessary ².

Key Features

The 3012479 Captive Washer Cap Screw features a robust design that includes a hex-shaped head for easy installation using standard tools. The screw is made from high-quality materials, typically a grade of steel that offers excellent strength and corrosion resistance. The integrated washer is held in place by a collar on the screw’s shank, ensuring it remains attached during use. Additionally, the screw’s threading is designed to provide a strong grip, enhancing its performance in demanding applications ³.

Benefits

Using this part offers several advantages. The integrated washer ensures consistent pressure distribution, which enhances the security of the fastening. The design also provides resistance to vibration, reducing the risk of loosening over time. Furthermore, the ease of installation, thanks to the hex-shaped head, allows for quick and efficient assembly, which is particularly beneficial in maintenance and repair scenarios.

Installation Process

To install the 3012479 Captive Washer Cap Screw, begin by ensuring the components to be fastened are properly aligned. Use a hex wrench to drive the screw into place, applying steady pressure to avoid cross-threading. It is important to tighten the screw to the manufacturer’s specified torque settings to ensure optimal performance and avoid over-tightening, which could damage the components or the screw itself. Always use the appropriate tools and follow best practices to achieve a secure and reliable fastening.

Maintenance and Troubleshooting

Regular maintenance of the 3012479 Captive Washer Cap Screw involves checking for signs of loosening or corrosion. If the screw appears loose, it should be re-tightened to the specified torque settings. In cases of corrosion, the affected area should be cleaned, and the screw may need to be replaced if significant damage is present. Keeping the screw and surrounding components clean and free of debris will help maintain its performance and longevity.

Compatibility and Applications

The 3012479 Captive Washer Cap Screw is designed for use in various commercial truck assemblies. It is commonly applied in engine components, chassis parts, and other areas where secure and vibration-resistant fastening is required. When selecting fasteners for specific applications, it is important to consider compatibility with other components and the environmental conditions the screw will encounter.

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 commercial truck industry. The company’s product range includes a variety of components designed to enhance the performance, reliability, and efficiency of heavy-duty vehicles. Cummins’ commitment to excellence is reflected in its comprehensive lineup of parts and services, which are trusted by professionals worldwide.

Captive Washer Cap Screw (Part 3012479) in Cummins Engines

The Captive Washer Cap Screw, part number 3012479, manufactured by Cummins, is a critical component in several of their engine models. This part is designed to secure various engine parts, ensuring stability and reliability during operation. Here’s how it integrates with specific Cummins engines:

N14 MECHANICAL

In the N14 MECHANICAL engine, the Captive Washer Cap Screw is utilized in several key areas. It is often employed to fasten components that require precise alignment and secure fastening, such as the cylinder head to the engine block. This ensures that the engine operates smoothly and efficiently, maintaining the integrity of the engine’s structure.

NH/NT 855

For the NH/NT 855 engines, the Captive Washer Cap Screw is integral to the assembly of various engine parts. It is commonly used in securing the intake and exhaust manifolds, ensuring that these components are tightly fastened and properly aligned. This is crucial for maintaining optimal engine performance and preventing leaks.

QSN14 CM876 N103

In the QSN14 CM876 N103 engine, the Captive Washer Cap Screw plays a vital role in fastening several critical components. It is often used in the assembly of the turbocharger system, where it helps secure the turbocharger to the engine block. This ensures that the turbocharger operates efficiently, contributing to the engine’s overall performance and reliability.

The Captive Washer Cap Screw is a testament to Cummins’ commitment to quality and durability, ensuring that these engines perform reliably under various conditions.

Role of Part 3012479 Captive Washer Cap Screw in Engine Systems

The 3012479 Captive Washer Cap Screw is integral to the assembly and secure functioning of various engine components. It is employed in the fastening and stabilization of multiple parts within the engine system, ensuring that components remain in place and operate efficiently.

In the accessory drive system, this screw is used to secure the accessory drive components, ensuring that they are properly aligned and do not shift during operation. Similarly, in the accessory drive mounting, it plays a role in maintaining the structural integrity of the mounting system.

For the air compressor kit, the screw is utilized to fasten various parts of the compressor, ensuring that the assembly remains stable under operational pressures. In the governor mounting fuel pump, it secures the governor to the fuel pump, maintaining the precise alignment needed for optimal performance.

Within the base parts of the engine, the screw is employed to fasten critical components, providing a stable foundation for the engine’s operation. In the drive and accessory systems, it ensures that all driven components are securely attached, preventing any potential misalignment.

For the EBM: pump and lube oil systems, the screw is used to secure pump components and oil passages, ensuring that oil flow is consistent and unimpeded. In the context of engine rotation, it helps in securing parts that are subject to rotational forces, maintaining their position and functionality.

The FP & Gov sump and fuel pump systems rely on this screw to secure the sump and fuel pump components, ensuring that fuel delivery is reliable and consistent. In the fuel pump and W/W governor mounting, it provides the necessary stability for these critical components.

In the hydraulic pump and hydraulic pump drive systems, the screw is used to secure pump components, ensuring efficient hydraulic fluid flow. For the lube pump and lubricating oil filter, it secures filter components, maintaining the integrity of the lubrication system.

The lubricating oil filter pump and oil pan systems utilize this screw to secure filter and pan components, ensuring that oil filtration and storage are effective. In the oil pan and dipstick assembly, it secures the dipstick in place, allowing for accurate oil level measurements.

For the oil pump, the screw is used to fasten pump components, ensuring consistent oil pressure throughout the engine. In the PDC kit, it secures components within the kit, maintaining their alignment and function.

In the pump, lubricating oil system, the screw ensures that all pump components are securely fastened, promoting efficient oil circulation. For the recirculation, exhaust, and water outlet systems, it secures components, ensuring that exhaust and coolant flow are managed effectively.

Finally, in the water outlet conn and water tube support systems, the screw is used to secure connections and supports, ensuring that coolant flow is consistent and that water tubes remain in place.

Conclusion

The 3012479 Captive Washer Cap Screw is a vital component in the assembly and maintenance of commercial trucks and Cummins engines. Its robust design, ease of installation, and resistance to vibration make it an essential fastener for ensuring the structural integrity and reliable performance of various engine components. Regular maintenance and proper installation are key to maximizing the benefits of this part, contributing to the overall efficiency and longevity of heavy-duty vehicles.