2863697
Captive Washer Cap Screw
Cummins®

Introduction

The Captive Washer Cap Screw 2863697 is a specialized fastener produced by Cummins, a leading manufacturer in the commercial vehicle industry. This screw is designed for use in commercial trucks, where it plays a role in various mechanical assemblies. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications, ensuring reliable performance and durability in the field ¹.

Basic Concepts

A Captive Washer Cap Screw is a type of fastener that incorporates a washer within its design. This integration ensures that the washer remains in place during installation, reducing the risk of loss and simplifying the assembly process. The primary function of this screw is to secure components together while distributing load and preventing damage to the surfaces it connects. In mechanical assemblies, these screws are often used in applications where vibration and movement are common, as the captive washer helps maintain a consistent and secure connection ².

Role in Truck Operation

The 2863697 Captive Washer Cap Screw is utilized in various areas of commercial trucks to ensure structural integrity and performance. It is commonly found in engine components, chassis assemblies, and other critical areas where secure fastening is required. By providing a reliable connection, this screw helps maintain the alignment and stability of truck components, which is vital for the overall operation and safety of the vehicle. Its application in these areas underscores the importance of using high-quality fasteners in heavy-duty environments ³.

Key Features

The 2863697 Captive Washer Cap Screw boasts several key features that enhance its functionality and durability. It is constructed from high-strength materials, ensuring it can withstand the rigors of commercial truck use. The design includes a captive washer that is integral to the screw, eliminating the need for separate washers and reducing the complexity of installation. Additionally, the screw features a hexagonal head for easy tightening with standard tools, and its thread design provides a strong grip on the connected components.

Benefits

Using the 2863697 Captive Washer Cap Screw offers several advantages. The integrated washer design simplifies the installation process, reducing the time and effort required for assembly. This screw also contributes to improved reliability, as the captive washer ensures a consistent and secure connection, minimizing the risk of fastener loss or failure. Over time, the durability and ease of use of this screw can lead to potential cost savings by reducing the need for frequent replacements or repairs.

Troubleshooting and Maintenance

To ensure the longevity and optimal performance of the 2863697 Captive Washer Cap Screw, regular maintenance and proper installation are recommended. Common issues may include corrosion or wear, which can be mitigated by using the correct torque settings during installation and applying appropriate coatings or treatments to protect against environmental factors. If problems arise, inspecting the screw for signs of damage or loosening and addressing these issues promptly can help maintain the integrity of the assembly.

Cummins Engines

The Captive Washer Cap Screw, part number 2863697, is a component in several Cummins engine models. This part is integral to the assembly and functionality of these engines, ensuring secure fastening and stability.

ISM Series Engines

• ISM CM570 and ISM CM570/870: The Captive Washer Cap Screw is used in these engines to secure various components, ensuring that parts remain tightly fastened under operational stresses. Its design allows for easy installation and removal, which is crucial during maintenance and repairs.

• ISM CM876: In the ISM CM876 engine, this part plays a similar role, providing the necessary fastening for critical engine components. Its reliability and strength are essential for maintaining engine integrity.

ISM11 Series Engines

• ISM11 CM876 SN: This engine variant also utilizes the Captive Washer Cap Screw to secure components, ensuring that the engine operates smoothly and efficiently. The screw’s design helps in maintaining the alignment and stability of parts during operation.

M11 Series Engines

• M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL: These engines incorporate the Captive Washer Cap Screw in their design to fasten various parts securely. The screw’s captive washer feature provides added security, preventing loosening due to vibrations and operational stresses.

QSM11 Series Engines

• QSM11 CM570 and QSM11 CM876: In these engines, the Captive Washer Cap Screw is used to fasten components that require precise alignment and stability. Its design ensures that parts remain securely fastened, contributing to the overall reliability and performance of the engine.

The Captive Washer Cap Screw is a versatile and essential component across these Cummins engine models, ensuring that critical parts remain securely fastened and aligned during operation. Its design and functionality are tailored to meet the demands of each specific engine variant, contributing to the overall performance and longevity of the engines.

Role in Engine Systems

In the context of engine systems, the part 2863697 Captive Washer Cap Screw is instrumental in ensuring the secure attachment and reliable operation of various components. One of its primary applications is within the rocker lever assembly.

Rocker Lever Assembly

The rocker lever, a pivotal component in the valve train of an engine, relies on precise and steadfast connections to function effectively. The Captive Washer Cap Screw, part 2863697, is employed to fasten the rocker lever to its pivot point, typically the rocker arm stud. This secure attachment is essential for maintaining the correct geometry and operational dynamics of the valve train.

By integrating the captive washer within the screw design, this part ensures that the washer remains in place during assembly and disassembly processes. This feature mitigates the risk of washer loss, which could lead to improper torque application and subsequent component failure.

Additionally, the design of the Captive Washer Cap Screw aids in distributing the clamping force evenly across the connection point. This even distribution is vital for preventing stress concentrations that could lead to fatigue or fracture of the rocker lever or its pivot point over time.

Conclusion

The 2863697 Captive Washer Cap Screw by Cummins is a critical component in the maintenance and operation of commercial trucks and Cummins engines. Its design, featuring an integrated washer, simplifies installation and ensures a secure, consistent connection. The screw’s high-strength materials and hexagonal head facilitate easy tightening and reliable performance under heavy-duty conditions. Regular maintenance and proper installation practices are essential to maximize the longevity and effectiveness of this part, contributing to the overall reliability and safety of the vehicle and engine systems.