3900706
Slotted Set Screw
Cummins®

Introduction

The Slotted Set Screw 3900706 is a specialized fastener produced by Cummins, a leading manufacturer in the automotive and heavy-duty truck industries. This set screw is designed for use in commercial trucks, where it plays a role in securing various components and assemblies. Its robust construction and precise engineering make it a reliable choice for maintaining the integrity of truck systems.

Basic Concepts of Slotted Set Screws

A Slotted Set Screw is a type of fastener used to secure objects or components within a mechanical assembly. It features a slot across its head, allowing for easy installation and removal using a flat-head screwdriver. Slotted set screws function by applying pressure to a surface, which helps to hold components in place and prevent movement or misalignment. They are commonly used in applications where a permanent or semi-permanent fastening solution is required ¹.

Purpose of the 3900706 Slotted Set Screw in Truck Operation

The 3900706 Slotted Set Screw by Cummins is integral to the operation and maintenance of commercial trucks. It is utilized in various applications where secure fastening is necessary, such as in engine components, transmission systems, and chassis assemblies. By providing a stable and reliable connection, this set screw contributes to the overall performance and durability of truck systems. Its application areas include securing gears, shafts, and other rotating components, ensuring they remain properly aligned and function efficiently ².

Key Features

The 3900706 Slotted Set Screw boasts several key features that enhance its performance and durability. It is constructed from high-quality materials, ensuring resistance to corrosion and wear. The screw’s design specifications include a precise thread pitch and a durable slot for easy installation. Additionally, it may feature unique attributes such as a conical point for improved penetration and a hardened surface for increased strength ³.

Benefits of Using the 3900706 Slotted Set Screw

Utilizing the 3900706 Slotted Set Screw offers several advantages. It provides improved security for components, ensuring they remain firmly in place under various operating conditions. The ease of installation and removal facilitated by the slotted head allows for quick adjustments and maintenance. Furthermore, the screw’s robust construction contributes to the overall reliability of truck assemblies, reducing the likelihood of component failure and enhancing operational efficiency.

Installation Guidelines

Proper installation of the 3900706 Slotted Set Screw is crucial for ensuring secure fastening. Begin by selecting the appropriate size and type of set screw for the application. Use a flat-head screwdriver to drive the screw into the designated hole, applying steady pressure to avoid cross-threading. Ensure the screw is tightened to the manufacturer’s recommended torque specifications to achieve optimal holding power. Regularly inspect the installation to confirm the screw remains secure and has not loosened over time.

Troubleshooting and Maintenance

Common issues associated with Slotted Set Screws include loosening due to vibration or wear, and corrosion in harsh environments. To identify problems, regularly inspect the screws for signs of movement, corrosion, or damage. Maintenance tips to prolong the lifespan and effectiveness of the 3900706 Slotted Set Screw include applying a corrosion-resistant coating, using lock washers to prevent loosening, and replacing screws that show signs of wear or damage.

Safety Considerations

When working with Slotted Set Screws, it is important to observe safety practices to protect yourself and ensure proper handling. Wear personal protective equipment (PPE) such as gloves and safety glasses to prevent injury from sharp edges or flying debris. Use the correct tools for installation and removal to avoid damaging the screw or surrounding components. Follow all manufacturer guidelines and safety instructions to maintain a safe working environment.

Cummins: A Brief 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 is committed to quality, innovation, and customer satisfaction. The company’s extensive product range includes engines for on-highway and off-highway applications, as well as filtration and emission solutions. Cummins’ dedication to excellence and continuous improvement ensures that their products, like the 3900706 Slotted Set Screw, meet the highest standards of performance and reliability.

Compatibility with Cummins Engines

The Slotted Set Screw 3900706 is compatible with a wide range of Cummins engines, including:

• 4B3.9, 6B5.9, 6C8.3, B3.9 G, B4.5, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556, G5.9, G5.9 CM558, G8.3, G8.3 CM558, GTA8.3 CM558, ISB3.9 CM2220 B107, ISB5.9 CM2880 B127, ISB5.9G CM2180, ISL G CM2180, L GAS PLUS CM556, L8.9G CMOH2.0 L125B, L9.3 L105, QSB3.9 30 CM550, QSB3.9 CM2880 B138
• B6.7S, C GAS PLUS CM556, C8.3 G
• ISB5.9 GAS PLUS CM556
• QSB3.9 30 CM550

These engines benefit from the slotted design of the screw, which allows for easy adjustment and tightening, critical for maintaining engine integrity and performance.

Role of the 3900706 Slotted Set Screw in Engine Systems

In the intricate world of engine systems, the 3900706 Slotted Set Screw plays a significant role in ensuring the secure and efficient operation of various components. This small yet essential part is instrumental in maintaining the integrity and performance of the engine’s moving parts.

Application in Levers and Rockers

The Slotted Set Screw is commonly used in the assembly and adjustment of levers within engine systems. Specifically, it is employed to fasten the lever to its pivot point, ensuring that the lever operates smoothly without undue play or movement. This secure attachment is vital for the precise control of various engine functions, such as throttle management and valve operation.

In the context of rocker mechanisms, the Slotted Set Screw is utilized to hold the rocker in place on its support shaft. This application is particularly important in overhead valve (OHV) engines, where the rocker transmits motion from the camshaft to the valves. The screw ensures that the rocker remains aligned and does not shift during engine operation, which could lead to misfiring or reduced engine efficiency.

Integration with Rocker Levers and Supports

For rocker levers and their supports, the Slotted Set Screw provides the necessary tension to keep the rocker lever in constant contact with the camshaft or pushrod. This consistent contact is essential for the accurate timing of valve openings and closings, directly influencing the engine’s performance and fuel efficiency.

In scenarios where multiple rocker levers are employed, such as in engines with multiple cylinders, the Slotted Set Screw helps in fine-tuning the adjustment of each rocker lever. This adjustment is critical for balancing the engine’s operation across all cylinders, ensuring uniform power delivery and minimizing vibrations.

Ensuring Stability and Performance

Overall, the 3900706 Slotted Set Screw contributes to the stability and performance of engine components by providing a secure and adjustable fastening solution. Its role in maintaining the precise alignment and operation of levers and rockers underscores its importance in the complex interplay of engine mechanics.

Conclusion

The 3900706 Slotted Set Screw by Cummins is a vital component in the maintenance and operation of commercial trucks and various Cummins engines. Its robust construction, precise engineering, and versatile applications make it an indispensable part for securing and adjusting critical engine components. Proper installation, regular maintenance, and adherence to safety practices ensure the longevity and reliability of this Cummins part, contributing to the overall performance and efficiency of truck and engine systems.