4943908
Lock Nut
Cummins®

The 4943908 Lock Nut, a component manufactured by Cummins, is designed for use in commercial trucks. This part plays a role in securing various components and assemblies, contributing to the integrity and safety of truck operations ¹.

Basic Concepts of Lock Nuts

Lock nuts are mechanical fasteners that prevent loosening due to vibration or rotation. They provide additional resistance to turning forces that could cause a standard nut to unscrew. Lock nuts are used in applications requiring secure fastening, such as in the automotive and heavy-duty truck industries. They come in various designs, including those with nylon inserts, deformed threads, or prevailing torque features ².

Purpose of the 4943908 Lock Nut in Truck Operations

In commercial trucks, the 4943908 Lock Nut ensures that critical components remain securely fastened under dynamic conditions. It is used in applications where vibrations or rotational forces could lead to the loosening of standard nuts. By providing a more secure fastening solution, this Cummins part contributes to the overall safety and reliability of truck operations ³.

Key Features of the 4943908 Lock Nut

The 4943908 Lock Nut is designed with features that enhance its performance and reliability. Its material composition is chosen for durability and resistance to corrosion, making it suitable for the harsh environments often encountered in commercial trucking. The thread design of the lock nut is engineered to provide a strong grip on the corresponding bolt or stud, while any unique attributes, such as a nylon insert or deformed threads, further increase its locking capability.

Benefits of Using the 4943908 Lock Nut

The advantages of using the 4943908 Lock Nut include increased security of fastenings, which is particularly important in applications subject to vibration. Its design also offers resistance to loosening over time, contributing to the longevity of the fastening in harsh operating conditions. These benefits make this part a valuable component in the maintenance and operation of commercial trucks.

Installation Guidelines

Proper installation of the 4943908 Lock Nut is important to ensure optimal performance and safety. The installation process should follow manufacturer guidelines, which typically include torquing the nut to the specified level to achieve the desired locking effect without over-tightening, which could damage the threads or the component being fastened.

Troubleshooting Common Issues

Common problems associated with lock nuts, such as loosening or damage, can often be traced back to incorrect installation or environmental factors. Regular inspection and maintenance can help identify issues early. Suggested solutions may include re-torquing the nut, replacing damaged components, or applying a thread locker for additional security.

Maintenance Tips

To prolong the service life of the 4943908 Lock Nut and ensure continued reliable operation, regular inspection and maintenance are recommended. This includes checking for signs of wear or damage, ensuring that the nut remains properly torqued, and addressing any issues promptly to prevent further complications.

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 strong reputation in the commercial vehicle industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and global presence make it a trusted partner for commercial truck manufacturers and operators worldwide.

Lock Nut 4943908 Compatibility with Cummins Engines

The Lock Nut part number 4943908, manufactured by Cummins, is designed to secure various engine parts in place. This lock nut is compatible with a wide range of Cummins engines, ensuring a tight and reliable fit. Below is a detailed breakdown of the engines with which this lock nut is compatible:

ISX Series Engines

• ISX CM870
• ISX CM871
• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250
• ISX15 CM2250
• ISX15 CM2350 X101

ISM Series Engines

• ISM CM570/870
• ISM CM876

ISL Series Engines

• ISL CM2150
• ISL G CM2180
• ISL9 CM2250

QSK Series Engines

• QSK19 CM2350 K105
• QSK19 CM2350 K114
• QSK50 CM2350 K108
• QSK95 CM2350 K113

QSX Series Engines

• QSX11.9 CM2250 ECF
• QSX15 CM2250
• QSX15 CM2250 ECF

Other Series Engines

• 15N CM2380 M104B
• ISC CM2150
• ISC8.3 CM2250
• QSC9 CM2250/QSL9 CM2250
• QSL9 CM2250
• QSM11 CM876

This lock nut is engineered to meet the stringent requirements of Cummins engines, ensuring durability and performance. Its compatibility across various engine models underscores its versatility and importance in maintaining engine integrity.

Role of Part 4943908 Lock Nut in Engine Systems

The Part 4943908 Lock Nut is a component in securing various engine system connections, ensuring stability and preventing loosening under operational stress.

In the Exhaust Gas Recirculation (EGR) System, the Lock Nut is utilized to secure the EGR Cooler Kit and the EGR Valve. It ensures that the connections between the EGR Cooler and the EGR Valve remain intact, maintaining efficient recirculation of exhaust gases back into the intake manifold. This helps in reducing nitrogen oxides (NOx) emissions and improving overall engine performance.

Within the Turbocharger System, the Lock Nut plays a significant role in securing the V-Band Clamp, which is used to connect the exhaust manifold to the turbocharger. This secure connection is vital for maintaining the integrity of the exhaust flow, ensuring that the turbocharger operates efficiently without any leaks.

In the Air Handling System, the Lock Nut is employed in the Engineering/Air Handling Gasket Set to ensure that all connections are tight and leak-free. This is particularly important in maintaining the correct air-fuel ratio and ensuring that the engine receives the optimal amount of air for combustion.

Additionally, the Lock Nut is part of the Hardware Kit that accompanies various engine components. It is used to secure bolts and fasteners in the Exhaust Recirculation Air Arrangement, ensuring that all parts remain firmly in place under the high temperatures and pressures experienced during engine operation.

Overall, the Part 4943908 Lock Nut is a fundamental component in maintaining the structural integrity and operational efficiency of various engine systems.

Conclusion

The 4943908 Lock Nut is a critical component in the maintenance and operation of commercial trucks and Cummins engines. Its design and features ensure secure fastening under dynamic conditions, contributing to the safety and reliability of truck operations. Proper installation, regular maintenance, and understanding its role in various engine systems are essential for maximizing the performance and longevity of this part.