3906756
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw, part number 3906756, manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. This screw plays a significant role in the assembly and maintenance of various truck components, ensuring secure and reliable connections. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of fastener characterized by its hexagonal head, which allows for efficient torque application using common tools such as wrenches or sockets ¹. In the automotive industry, these screws are widely used for their ability to provide strong, secure fastening in various applications. They are typically made from materials like steel, stainless steel, or alloy steel, which offer excellent strength, corrosion resistance, and durability. The mechanical function of a Hexagon Head Cap Screw involves threading into a pre-drilled hole, creating a tight and stable connection between components ².

Purpose and Role in Truck Operation

This Cummins part is specifically designed for use in heavy-duty trucks. It plays a role in the assembly and maintenance of critical truck components, ensuring that parts remain securely fastened under significant stress and vibration. This screw is often used in applications where high torque and resistance to loosening are required, such as in engine mounts, chassis components, and other structural assemblies ³.

Key Features

The 3906756 Hexagon Head Cap Screw features a hexagonal head design, which provides a robust interface for tool engagement, allowing for precise torque application. Its threading specifications are tailored to ensure a strong, secure fit in the corresponding holes. Additionally, this screw may include unique attributes such as a corrosion-resistant coating or enhanced threading to improve performance and reliability in demanding environments ⁴.

Benefits

Using the 3906756 Hexagon Head Cap Screw offers several benefits. Its design allows for improved torque application, ensuring that components are securely fastened. The screw’s resistance to loosening helps maintain the integrity of connections over time, even under heavy-duty conditions. Additionally, the durable construction of the screw ensures long-lasting performance, reducing the need for frequent replacements ⁵.

Installation Guidelines

Proper installation of the 3906756 Hexagon Head Cap Screw involves several steps to ensure a secure fastening. Begin by ensuring the mating surface is clean and free of debris. Use a tap to create a precise thread in the pre-drilled hole if necessary. Insert the screw and use a wrench or socket to tighten it to the recommended torque specification. It is important to avoid over-tightening, which can damage the screw or the surrounding material ⁶.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening over time due to vibration or insufficient torque during installation. To address these issues, regularly inspect screws for signs of loosening and re-tighten as needed. If corrosion is present, consider replacing the screw to prevent further degradation. Proper maintenance, including regular inspections and torque checks, can help prolong the lifespan of the screw and ensure ongoing performance ⁷.

Cummins: Manufacturer Overview

Cummins Inc. is a renowned manufacturer with a rich history in the commercial truck industry. The company offers a wide range of products, including engines, powertrain components, and aftermarket parts. Cummins is known for its commitment to quality and innovation, ensuring that its components, like the 3906756 Hexagon Head Cap Screw, meet the highest standards of performance and reliability. The company’s dedication to excellence has earned it a strong reputation among truck manufacturers and operators ⁸.

Hexagon Head Cap Screw 3906756 Compatibility with Cummins Engines

The Cummins part number 3906756, a Hexagon Head Cap Screw, is designed to be compatible with a range of Cummins engines. This part is integral in securing various components within the engine assembly, ensuring structural integrity and operational efficiency.

Compatibility with Specific Engine Models

• 4B3.9 and 6B5.9 Engines The Hexagon Head Cap Screw 3906756 is utilized in both the 4B3.9 and 6B5.9 engines. These engines, known for their robust performance, require reliable fastening solutions to maintain the alignment and stability of critical engine parts. The screw’s design ensures that it can withstand the operational stresses and thermal fluctuations inherent in these engines ⁹.

• B5.9 G and B5.9 GAS PLUS CM556 Engines For the B5.9 G and B5.9 GAS PLUS CM556 engines, the 3906756 screw plays a crucial role in securing components that are exposed to high temperatures and pressures. Its hex head design allows for easy and precise tightening, which is essential for maintaining the engine’s operational parameters ¹⁰.

• ISX CM870 Engine The ISX CM870 engine, a high-performance model, also benefits from the use of the 3906756 Hexagon Head Cap Screw. This engine, designed for heavy-duty applications, requires fastening solutions that can endure significant mechanical and thermal stresses. The screw’s durability and strength make it an ideal choice for this engine’s demanding environment ¹¹.

Grouping of Engine Models

The engines listed can be grouped based on their performance characteristics and the environments in which they operate. The 4B3.9 and 6B5.9 engines, while robust, are typically used in medium-duty applications. The B5.9 G and B5.9 GAS PLUS CM556 engines, on the other hand, are designed for more specialized tasks, often involving gas-powered operations. The ISX CM870 engine represents the pinnacle of Cummins’ engineering, designed for heavy-duty, high-performance applications ¹².

Application Considerations

When using the 3906756 Hexagon Head Cap Screw in these engines, it is important to consider the specific operational conditions and the mechanical stresses the screw will encounter. Proper installation and maintenance of this screw are critical to ensuring the longevity and reliability of the engine components it secures ¹³.

Part 3906756 Hexagon Head Cap Screw Component Usage

The part 3906756 Hexagon Head Cap Screw is instrumental in securing various components within engine systems, ensuring stability and reliable operation.

Air Isolation Valve

In the air isolation valve system, the 3906756 Hexagon Head Cap Screw is used to fasten the valve housing to the engine block or manifold. This secure attachment prevents any unwanted movement or vibration that could lead to air leaks or inefficient operation ¹⁴.

Alternator Location

When positioning the alternator, the 3906756 Hexagon Head Cap Screw plays a key role in mounting the alternator to its designated location on the engine. This ensures that the alternator remains firmly in place, allowing it to generate electricity consistently without the risk of dislodging ¹⁵.

Mounting Components

For both the alternator and refrigerant compressor, the 3906756 Hexagon Head Cap Screw is utilized in the mounting brackets. These screws provide the necessary tension and stability to keep the components aligned and securely attached to the engine. This is essential for maintaining the structural integrity and operational efficiency of the engine system ¹⁶.

Refrigerant Compressor

In the refrigerant compressor assembly, the 3906756 Hexagon Head Cap Screw is employed to attach the compressor housing to the engine block. This secure fastening is vital for the compressor’s stable operation, ensuring it can effectively manage refrigerant flow without any risk of detachment or misalignment ¹⁷.

Conclusion

The 3906756 Hexagon Head Cap Screw is a critical component in the assembly and maintenance of heavy-duty truck engines. Its robust design, compatibility with various Cummins engines, and key role in securing critical components make it an essential part for ensuring the reliability and performance of commercial trucks. Proper installation, maintenance, and understanding of its applications are vital for maximizing the benefits of this Cummins part.