3907769
Hexagon Head Cap Screw
Cummins®

The Cummins Hexagon Head Cap Screw, part number 3907769, is a specialized fastener designed for use in heavy-duty truck components. This screw is integral to ensuring the secure assembly of various truck parts, contributing to the overall reliability and performance of heavy-duty vehicles.

Basic Concepts of Hexagon Head Cap Screws

Hexagon Head Cap Screws are a type of fastener characterized by a hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. These screws function by converting rotational force into axial force, which clamps components together. In the automotive industry, they are commonly used for their strength and ease of use in a variety of applications, including engine components, chassis parts, and body panels ¹.

Purpose of the 3907769 Hexagon Head Cap Screw in Truck Operations

This Cummins part plays a specific role in the operation of heavy-duty trucks by securing critical components and systems. It is often used in applications where high tensile strength and resistance to vibration are required, such as in the engine compartment, transmission systems, and chassis assemblies. Its design ensures that components remain firmly in place under the demanding conditions experienced by heavy-duty trucks.

Key Features of the 3907769 Hexagon Head Cap Screw

The 3907769 is crafted from high-quality materials, typically a grade of steel that offers excellent strength and durability. It features a coarse thread type, which provides a strong grip and efficient load distribution. Unique design elements, such as a countersunk head, allow for flush mounting with the surface, reducing the risk of damage to adjacent parts. These features contribute to the screw’s functionality and longevity in heavy-duty applications.

Benefits of Using the 3907769 Hexagon Head Cap Screw

Utilizing this part offers several advantages. Its high tensile strength ensures a secure fastening, while its design resists loosening due to vibration. The ease of installation and removal, thanks to the hexagonal head, simplifies maintenance procedures. Additionally, the screw’s durability reduces the need for frequent replacements, contributing to cost efficiency and operational reliability.

Installation and Usage Guidelines

Proper installation of the 3907769 involves several steps to ensure a secure fit. Begin by cleaning the mating surfaces to remove any debris or contaminants. Use a torque wrench to apply the recommended torque specification, which varies depending on the application but is typically provided in the manufacturer’s guidelines. It is important to follow these specifications to avoid over-tightening, which can damage threads, or under-tightening, which can lead to loosening ².

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration and corrosion. Regular inspections can help identify these problems early. Maintenance tips include periodic checks for tightness and signs of corrosion, as well as re-tightening as necessary. Applying a thread locker can also help prevent loosening in high-vibration environments.

Cummins: Manufacturer 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 has established a reputation for quality and innovation in the automotive and heavy-duty truck industry. The company’s commitment to excellence is evident in its wide range of products, which are designed to meet the demanding requirements of heavy-duty applications. Cummins’ focus on quality ensures that components like the 3907769 are reliable and perform well under challenging conditions.

Cummins Engine Compatibility with Hexagon Head Cap Screw Part 3907769

The Cummins Hexagon Head Cap Screw part number 3907769 is a versatile component that is compatible with a wide range of Cummins engines. This screw is designed to provide a secure fastening solution in various engine applications, ensuring that components remain tightly secured during operation.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• B4.5 CM2350 B129B
• B4.5 RGT
• B5.6 CM2670 B152B
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• B6.7S
• C GAS PLUS CM556
• C8.3 G
• D4.0 CM2620 D103B
• F2.8 CM2620 F135B
• F3.8 CM2350 F120B
• F3.8 CM2350 F128C
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

Grouping of Compatible Engines

• B Series Engines:

  • B4.5
  • B4.5 CM2350 B129B
  • B4.5 RGT
  • B5.6 CM2670 B152B
  • B5.9 CM2670 B166C
  • B5.9 G
  • B5.9 GAS PLUS CM556
  • B6.7 CM2350 B135B
  • B6.7 CM2670 B153B
  • B6.7 CM2670 B164C
  • B6.7 G CMOH6.0 B125
  • B6.7S

• C Series Engines:

  • C GAS PLUS CM556
  • C8.3 G

• F Series Engines:

  • F2.8 CM2620 F135B
  • F3.8 CM2350 F120B
  • F3.8 CM2350 F128C
  • F3.8 CM2620 F137B
  • F3.8 F102
  • F4.5 CM2620 F139B
  • F4.5 CM2620 F141C

• Other Series Engines:

  • 4B3.9
  • 6B5.9
  • 6C8.3
  • D4.0 CM2620 D103B

This comprehensive compatibility ensures that the Hexagon Head Cap Screw part 3907769 can be utilized across a broad spectrum of Cummins engines, providing a reliable fastening solution for various engine components.

Role of Part 3907769 Hexagon Head Cap Screw in Engine Systems

The 3907769 Hexagon Head Cap Screw is integral in securing various components within engine systems, ensuring stability and efficient operation.

In the accessory drive pulley system, this screw is employed to fasten the pulley to the engine block or accessory bracket, maintaining alignment and tension of the drive belt. This is essential for the smooth transfer of power to accessories.

For the alternator drive system, the screw plays a role in attaching the alternator to its mounting bracket. This secure attachment is vital for the alternator’s stable operation, ensuring consistent power generation for the vehicle’s electrical systems.

In alternator mounting, the screw is used to secure the alternator to the engine, providing the necessary rigidity to withstand vibrations and ensure reliable electrical output.

Within the fan drive system, the screw is utilized to connect the fan to its mounting, allowing for efficient cooling of the engine by ensuring the fan operates at the correct angle and speed.

For fan drive mounting, the screw secures the fan drive mechanism to the engine, which is important for maintaining the correct operation of the cooling system.

In the fan pulley system, the screw is instrumental in attaching the pulley to the fan drive, ensuring that the fan rotates correctly in response to engine speed.

The fan support system uses the screw to secure the fan to its housing, providing the necessary support to handle the forces exerted during operation.

In the refrigerant compressor drive system, the screw is used to attach the compressor to its mounting, ensuring efficient operation of the vehicle’s air conditioning system.

Lastly, in the water pump drive system, the screw secures the water pump to the engine, ensuring proper circulation of coolant throughout the engine to maintain optimal operating temperatures.

Conclusion

The Cummins Hexagon Head Cap Screw, part number 3907769, is a critical component in the assembly and maintenance of heavy-duty truck engines. Its design and material properties ensure high tensile strength, resistance to vibration, and ease of use, making it an essential part for securing various engine components. Proper installation and maintenance of this screw contribute to the reliability and performance of heavy-duty vehicles.