4389733
Hexagon Head Cap Screw
Cummins®

Introduction

The Cummins 4389733 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. It is engineered to meet the demanding requirements of heavy-duty applications, ensuring secure and reliable fastening of various components within the truck’s structure and engine system.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of bolt characterized by its hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. These screws are commonly used in mechanical assemblies to secure components together. The hexagonal shape of the head provides a firm grip, reducing the risk of slippage during installation or removal ¹.

Purpose and Role in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of commercial trucks. It is utilized in various application areas within the truck, including but not limited to, securing engine components, attaching body panels, and fastening chassis parts. By providing a strong and durable connection, this screw contributes to the overall structural integrity and performance of the truck ².

Key Features

The 4389733 is distinguished by several key features that enhance its functionality and durability. It is typically made from high-strength materials such as alloy steel, which offers excellent resistance to wear and corrosion. The screw features a coarse thread type, which allows for quick and secure fastening. Its hexagonal head design ensures easy installation and removal, while also providing a robust grip to prevent loosening under vibration or stress ³.

Benefits

Using this Cummins part offers several benefits. The screw’s design and material composition provide enhanced security, ensuring that components remain firmly attached even under demanding conditions. Its resistance to vibration helps maintain a tight connection over time, reducing the need for frequent re-tightening. Additionally, the ease of installation and removal simplifies maintenance procedures, allowing for efficient repairs and adjustments.

Installation Considerations

Proper installation techniques are crucial to ensure the optimal performance and longevity of this part. It is recommended to use the appropriate torque specifications provided by the manufacturer to achieve the correct tension without over-tightening, which could lead to damage. Additionally, applying a thread locker or anti-seize compound can help prevent loosening and corrosion, further enhancing the screw’s reliability.

Troubleshooting and Maintenance

Common issues associated with Hexagon Head Cap Screws include loosening due to vibration, corrosion, and wear. To address these problems, regular inspections should be conducted to check for any signs of damage or loosening. If corrosion is detected, cleaning the affected area and applying a protective coating can help prevent further deterioration. In cases of wear or damage, replacing the screw with a new one is recommended to maintain the integrity of the fastening.

Manufacturer Overview - Cummins

Cummins Inc. is a globally recognized leader in the design, manufacture, and distribution of engines and related technologies. With a rich history of innovation and quality, Cummins has established a strong reputation for producing reliable and high-performance automotive components. The Cummins 4389733 Hexagon Head Cap Screw is a testament to the company’s commitment to excellence, offering truck operators and maintenance professionals a dependable solution for their fastening needs.

Hexagon Head Cap Screw 4389733 in Cummins Engines

The 4389733 is a critical component in various Cummins engines, ensuring structural integrity and operational efficiency. This part is designed to fit seamlessly within the engine architecture, providing a reliable fastening solution for different engine components.

QSK19 Series

In the QSK19 series engines, the 4389733 is utilized in multiple configurations:

• QSK19 CM2350 K105
• QSK19 CM2350 K114

These engines benefit from the screw’s ability to secure various parts, ensuring that the engine’s internal components remain tightly fastened and properly aligned.

QSK50 Series

The QSK50 series engine, specifically the:

• QSK50 CM2350 K108

also incorporates the 4389733. This engine model relies on the screw’s precision and strength to maintain the structural integrity of its components under high operational stresses.

QSK95 Series

For the QSK95 series engine:

• QSK95 CM2350 K113

the 4389733 plays a pivotal role in securing critical engine parts, ensuring that the engine operates smoothly and efficiently.

QST30 Series

In the QST30 series engine:

• QST30 CM2350 T101

the 4389733 is used to fasten components that are crucial for the engine’s performance and durability. Its design allows for easy installation and removal, facilitating maintenance and repair processes.

Role of Part 4389733 Hexagon Head Cap Screw in Engine Systems

The 4389733 is integral to the assembly and securement of various components within engine systems. Its robust design ensures reliable fastening, which is essential for the proper functioning and durability of the engine’s parts.

Aftertreatment Device

In the aftertreatment device, the 4389733 screw is used to fasten critical components such as the sensor housing and the mounting kit. This ensures that the sensors are securely positioned to accurately monitor emissions and other vital parameters. The secure attachment of the mounting kit is also essential for the structural integrity of the aftertreatment device.

Aftertreatment Injector Kit

Within the aftertreatment injector kit, the 4389733 screw plays a role in securing the injector to the engine block or the junction box. This securement is vital for maintaining the precise alignment and operation of the injector, which is responsible for delivering treatment fluids to reduce emissions.

Decomposition Reactor

In the decomposition reactor, the 4389733 screw is employed to fasten the reactor components together. This includes securing the reactor to the engine system and ensuring that all internal components, such as the sensor housing, are firmly in place. This securement is important for the efficient breakdown of harmful emissions.

Junction Box

The junction box, which serves as a central point for electrical connections within the engine system, utilizes the 4389733 screw to ensure all connections are tightly secured. This prevents any loose connections that could lead to electrical issues or failures in the engine’s operation.

Service Kit

In a service kit, the 4389733 screw is often included to facilitate the reassembly of components after maintenance or repair. It ensures that all parts are correctly and securely reattached, maintaining the engine’s performance and reliability post-service.

Conclusion

Overall, the 4389733 Hexagon Head Cap Screw is a fundamental component in the securement and reliable operation of various engine system parts, contributing to the overall efficiency and longevity of the engine.