3066257
Regular Hexagon Jam Nut
Cummins®

Introduction

The Cummins 3066257 Regular Hexagon Jam Nut is a specialized fastener designed for use in commercial trucks. Its primary purpose is to provide a secure fastening solution in various truck components, ensuring stability and reliability in demanding operational environments. This part is integral to the maintenance and efficient operation of commercial trucks, contributing to the overall performance and longevity of the vehicle.

Basic Concepts of Regular Hexagon Jam Nuts

A Regular Hexagon Jam Nut is a type of fastener characterized by its hexagonal shape, which allows for easy tightening and loosening using standard tools. The jam nut functions by being tightened against another nut or threaded component, creating a locking mechanism that prevents loosening due to vibration or other dynamic forces. This design is particularly useful in applications where secure fastening is paramount ¹.

Purpose and Role in Truck Operation

The Cummins 3066257 Regular Hexagon Jam Nut plays a significant role in the operation and maintenance of commercial trucks. It is used in various truck components where secure fastening is required, such as in engine mounts, transmission systems, and chassis assemblies. By providing a reliable locking mechanism, this part helps maintain the integrity of these components under the stress of heavy-duty operations.

Key Features

The Cummins 3066257 Regular Hexagon Jam Nut features a hexagonal shape that facilitates easy installation and removal using standard wrenches or sockets. Its jam nut functionality involves being tightened against another nut to create a secure fastening. The material properties of this nut are designed to withstand the rigors of commercial truck use, offering durability and resistance to wear and corrosion.

Benefits

The use of the Cummins 3066257 Regular Hexagon Jam Nut in truck maintenance and operation offers several benefits. It provides enhanced security by preventing nuts from loosening due to vibration, which is common in heavy-duty truck applications. The ease of use, thanks to its hexagonal shape, allows for quick and efficient installation and removal. Additionally, its durable construction ensures long-lasting performance, reducing the need for frequent replacements ².

Installation and Usage Guidelines

To ensure optimal performance and longevity, the Cummins 3066257 Regular Hexagon Jam Nut should be installed according to specific guidelines. Begin by ensuring the primary nut is tightened to the manufacturer’s specified torque. Then, place the jam nut onto the thread and tighten it against the primary nut until a secure lock is achieved. It is important to use the correct tools and to avoid over-tightening, which can damage the threads or the nut itself.

Troubleshooting and Maintenance

Common issues with Regular Hexagon Jam Nuts include loosening due to insufficient tightening or damage from corrosion. To troubleshoot, check the torque settings and ensure the nut is properly seated. Regular maintenance involves inspecting the nut for signs of wear or corrosion and replacing it if necessary. Keeping the threads clean and free of debris will also help prolong the life of the nut and ensure reliable operation ³.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history of innovation and a commitment to quality, Cummins serves customers in approximately 190 countries and territories, providing reliable and efficient power solutions for various industries, including commercial trucking. The company’s dedication to excellence is reflected in its comprehensive product range and ongoing investment in research and development.

Compatibility with Cummins Engines

The Regular Hexagon Jam Nut, part number 3066257, manufactured by Cummins, is a versatile component designed to fit a range of Cummins engines. This part is essential for securing various parts and ensuring the integrity of the engine assembly. Below is a detailed description of its compatibility with specific Cummins engines:

ISM Series Engines

• ISM CM570
• ISM CM570/870
• ISM CM876
• ISM11 CM876 SN

M11 Series Engines

• M11 CELECT
• M11 CELECT PLUS
• M11 MECHANICAL

N14 Series Engines

• N14 CELECT PLUS
• N14 MECHANICAL

QSB6.7 Series Engines

• QSB6.7 M CM2250

QSK19 Series Engines

• QSK19 CM500

QSM11 Series Engines

• QSM11 CM570
• QSM11 CM876

QSN14 Series Engines

• QSN14 CM876 N103
• QSNT14 CM876 N102

Role in Engine Systems

The Cummins 3066257 Regular Hexagon Jam Nut is a versatile component utilized across various engine systems to ensure secure fastening and stability. In brake systems, this part is employed to lock the primary nut in place on caliper brackets, preventing loosening due to vibrations and ensuring consistent brake performance.

Within the engine assembly, the jam nut is integral in securing the fuel plumbing bracket. This bracket is responsible for organizing and routing fuel lines, and the jam nut’s role is to maintain the bracket’s position and alignment, which is essential for the efficient operation of the fuel system.

For the fuel transfer pump, the jam nut is used to secure mounting bolts, ensuring the pump remains firmly attached to the engine or frame. This stability is vital for the pump’s operation, as any movement can affect its efficiency and the overall fuel delivery system.

In the context of injectors, specifically the top-level assembly lever and the injector lever, the jam nut is utilized to secure adjustment screws or bolts. This ensures that the injector’s settings remain unchanged, which is important for maintaining precise fuel injection timing and quantity.

Similarly, for the rocker and its top-level assembly lever, the jam nut plays a role in securing the adjustment nuts. This is essential for maintaining the correct valve clearance, which is critical for engine performance and longevity.

Conclusion

The Cummins 3066257 Regular Hexagon Jam Nut is a fundamental component in ensuring the secure fastening of various engine and brake system components, contributing to the reliability and performance of the vehicle. Its compatibility with a wide range of Cummins engines underscores its versatility and importance in maintaining the structural integrity and operational efficiency of these engines.