3074975
Regular Hexagon Jam Nut
Cummins®

The Regular Hexagon Jam Nut, part number 3074975, is a specialized fastening component manufactured by Cummins, a prominent name in the automotive and heavy-duty truck industry. This part is designed for use in commercial trucks, where it plays a role in securing various components and assemblies, ensuring the reliability and safety of the vehicle ¹.

Basic Concepts of Regular Hexagon Jam Nuts

A Regular Hexagon Jam Nut is a type of lock nut characterized by its hexagonal shape and jam nut design. This design allows it to be tightened against another nut or a threaded component, creating friction that prevents loosening. The hexagonal shape provides a stable surface for tools to grip, facilitating easy and secure installation ².

Purpose and Role in Truck Operation

In the context of commercial truck operations, the Regular Hexagon Jam Nut serves to secure critical components and assemblies. Its primary role is to maintain the integrity of fastenings under dynamic conditions, such as vibrations and varying loads, which are common in heavy-duty truck applications ³.

Key Features

The Regular Hexagon Jam Nut features a hexagonal shape that allows for efficient tightening and loosening with standard tools. Its jam nut design enhances security by creating additional friction when tightened against another nut or threaded component. The nut is typically made from high-strength materials, ensuring durability and resistance to wear and corrosion. Additionally, its design may include features such as a serrated inner surface to further increase resistance to loosening ⁴.

Benefits

The Regular Hexagon Jam Nut offers several benefits in heavy-duty applications. Its design provides improved security against loosening, which is crucial in environments where vibrations and dynamic loads are present. The material composition ensures durability and resistance to corrosion, contributing to the longevity of the fastening. Moreover, its reliability in securing components enhances the overall safety and performance of commercial trucks ⁵.

Installation Guidelines

Proper installation of the Regular Hexagon Jam Nut involves several steps to ensure optimal performance. Begin by cleaning the threaded area to remove any debris or corrosion. Use the appropriate tool to apply the specified torque, ensuring the nut is tightened to the manufacturer’s recommendations. It is advisable to use a torque wrench for precision. After initial tightening, the jam nut should be tightened against another nut or the threaded component to create the desired friction. Regular inspection and maintenance are recommended to ensure the fastening remains secure over time ⁶.

Troubleshooting and Maintenance

Common issues with the Regular Hexagon Jam Nut may include loosening, corrosion, or damage. To address loosening, re-tighten the nut to the specified torque and ensure proper friction is created with the jam nut design. Corrosion can be mitigated by applying a compatible anti-seize compound during installation. If damage is detected, replace the nut to maintain the integrity of the fastening. Regular inspections should be conducted to identify and address any issues promptly ⁷.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong reputation in the automotive industry, Cummins is committed to producing high-quality components for commercial vehicles. Their products are known for reliability, performance, and durability, making them a preferred choice for heavy-duty truck applications ⁸.

Compatibility with Cummins Engines

The Regular Hexagon Jam Nut, identified by part number 3074975 and manufactured by Cummins, is a crucial component in the assembly and maintenance of several Cummins engine models. This part is specifically designed to fit seamlessly with the following engines:

• N14 CELECT PLUS
• QSN14 CM876 N103
• QSNT14 CM876 N102

These engines, while distinct in their specific configurations and applications, share a commonality in their design that necessitates the use of the Regular Hexagon Jam Nut. This compatibility ensures that the nut can effectively secure and stabilize various components within the engine assembly, contributing to the overall reliability and performance of the engine ⁹.

Role of Part 3074975 Regular Hexagon Jam Nut in Engine Systems

In engine systems, the Regular Hexagon Jam Nut is instrumental in securing various components, ensuring their stability and proper function.

Securing the Adjusting Screw

The jam nut is often paired with an adjusting screw to fine-tune the tension or clearance within the engine. By locking the primary nut in place, it prevents the adjusting screw from shifting out of its calibrated position, thus maintaining the desired mechanical advantage or clearance.

Stabilizing the Lever

When integrated with a lever mechanism, the jam nut plays a significant role in stabilizing the lever’s pivot point. This stability is essential for consistent operation, whether the lever is used for valve actuation, throttle control, or other functions within the engine system.

Enhancing Rocker Stability

In systems utilizing rockers, the jam nut is employed to secure the rocker in its designated position. This ensures that the rocker maintains its intended motion and contact points with other components, such as valves or pushrods, contributing to the engine’s overall performance and reliability.

Supporting the Rocker Lever

For rocker levers, which often require precise adjustment, the jam nut is used to lock the primary nut after the lever has been set to the correct position. This prevents any unintended movement that could affect the valve timing or operation, ensuring the engine runs smoothly and efficiently.

Conclusion

The Regular Hexagon Jam Nut, part number 3074975, is a vital component in the maintenance and operation of commercial trucks and Cummins engines. Its design and features ensure secure fastening, durability, and resistance to loosening and corrosion. Proper installation and maintenance are essential to maximize its benefits and ensure the reliability and safety of the vehicle.