3070394
Captive Washer Cap Screw
Cummins®

The Captive Washer Cap Screw, specifically Part #3070394 by Cummins, is a component integral to the maintenance and operation of heavy-duty trucks. Cummins Inc., a renowned manufacturer in the commercial truck industry, produces this part, underscoring its reliability and quality. This screw is designed to enhance the efficiency and durability of truck assemblies, playing a significant role in various mechanical systems ¹.

Basic Concepts

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which is held in place by a protrusion or step in the screw’s shaft. This design ensures that the washer remains attached to the screw, preventing loss during installation and providing consistent sealing and load distribution. In mechanical assemblies, these screws are used to secure components while offering enhanced sealing against leaks and improved resistance to vibration ².

Purpose of the 3070394 Captive Washer Cap Screw

This Cummins part is specifically engineered for use in commercial trucks. It plays a role in securing various truck components, ensuring they remain firmly in place under the demanding conditions of heavy-duty operations. Its application spans across different truck systems, where it contributes to the structural integrity and operational efficiency of the vehicle ³.

Key Features

The 3070394 Captive Washer Cap Screw boasts several design elements that enhance its functionality and durability. These include a robust construction that withstands high stress and vibration, a captive washer that ensures consistent sealing, and a design that facilitates easy installation and removal. These features collectively contribute to the screw’s reliability in heavy-duty applications.

Benefits

Utilizing this Cummins part offers several advantages. It improves assembly efficiency by eliminating the need for separate washers, enhances sealing capabilities to prevent leaks, and increases resistance to vibration and loosening. These benefits contribute to the overall reliability and maintenance efficiency of commercial trucks.

Installation Guidelines

Proper installation of the 3070394 Captive Washer Cap Screw is crucial for optimal performance and longevity. The process involves selecting the correct size and type of screw for the application, ensuring the mating surfaces are clean and free of debris, and using the appropriate torque settings to secure the screw without over-tightening. Following these guidelines ensures the screw functions as intended, providing secure fastening and reliable sealing.

Troubleshooting and Maintenance

Common issues with Captive Washer Cap Screws include loosening due to vibration, corrosion, and wear. Identifying these problems early can prevent more significant failures. Maintenance tips include regular inspection for signs of wear or corrosion, ensuring proper torque during installation, and replacing screws that show signs of damage or excessive wear. These practices help prolong the lifespan of the screw and associated components.

Compatibility and Applications

The 3070394 Captive Washer Cap Screw is designed for use in various commercial truck systems. Its compatibility with other Cummins components ensures seamless integration into truck assemblies, contributing to the overall performance and reliability of the vehicle.

Manufacturer Overview - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history of innovation and a commitment to quality, Cummins has established a strong reputation in the commercial truck industry. The company’s extensive product range and focus on customer satisfaction underscore its position as a trusted manufacturer in the field.

Cummins Part 3070394: Captive Washer Cap Screw in Engine Applications

This Cummins part is a critical component in the assembly and maintenance of several engine models. It is designed to provide secure fastening, ensuring that various engine parts remain tightly connected under operational stresses.

V903 and VTA903 Engines

In the V903 and VTA903 engines, the Captive Washer Cap Screw is used in several key areas. It is essential for securing components that are subject to high torque and vibration, ensuring that the engine maintains its structural integrity and operational efficiency. The screw’s design allows it to stay in place even under extreme conditions, preventing loosening and potential engine failure.

CM2250 Engine

The CM2250 engine also relies on the Captive Washer Cap Screw for its assembly. This engine, known for its robust performance, uses the screw in various critical junctures where secure fastening is paramount. The screw’s captive washer feature ensures that it remains fixed, providing a reliable connection that can withstand the engine’s operational demands.

V105 Engine

Similarly, in the V105 engine, the Captive Washer Cap Screw plays a vital role. This engine, designed for high-performance applications, requires components to be fastened securely to maintain efficiency and reliability. The screw’s design ensures that it provides a stable and durable connection, contributing to the engine’s overall performance and longevity.

The use of the Cummins part 3070394 across these engines highlights its importance in maintaining the structural integrity and operational efficiency of the engines. Its design and functionality make it an indispensable part in the assembly and maintenance of these engines.

Role of Part 3070394 Captive Washer Cap Screw in Engine Systems

In the intricate assembly of engine systems, the Part 3070394 Captive Washer Cap Screw serves as a vital fastening element, ensuring the secure attachment of various components. Its application spans across multiple engine subsystems, contributing to the overall stability and functionality of the engine.

Integration with Key Components

• Arrangement and Mounting: The Captive Washer Cap Screw is instrumental in the precise arrangement and mounting of engine components. It secures parts in their designated positions, maintaining the structural integrity of the engine.

• Oil Fill and Belt Guard: In the oil fill system, this screw ensures the secure attachment of the oil fill cap, preventing leaks and maintaining oil levels. Similarly, for the belt guard, it provides a tight fit, safeguarding the belts from external elements and ensuring smooth operation.

• Engine Brake and Lever: When integrated with the engine brake and lever mechanisms, the screw plays a role in maintaining the mechanical advantage and operational efficiency. It ensures that these components function under the designed parameters without undue stress or movement.

• Rocker and Rocker Housing Mounting: The screw is employed in the mounting of rockers and their housings. This secure attachment is essential for the proper functioning of the valve train, ensuring consistent valve operation and engine performance.

• Tube Support: In systems where tube supports are necessary, the Captive Washer Cap Screw provides the required tension and stability. This is particularly important in high-pressure or high-temperature environments where component integrity is paramount.

• Alternator Attachment: The screw is also used in securing the alternator to its mounting bracket. This ensures a stable power source for the engine’s electrical systems, contributing to the overall reliability of the engine.

Conclusion

In summary, the Part 3070394 Captive Washer Cap Screw is a fundamental component in the assembly and operation of various engine systems. Its role in securing and maintaining the position of critical parts underscores its importance in engine design and functionality.

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