3974668
Lock Washer
Cummins®

The Cummins 3974668 Lock Washer is a specialized component designed for use in commercial truck maintenance and operation. This lock washer serves a specific purpose in ensuring the integrity of bolted connections, which is vital for the safe and efficient functioning of commercial trucks. Understanding its role and significance can contribute to better maintenance practices and operational reliability.

Basic Concepts of Lock Washers

Lock washers are mechanical devices used in fastening applications to prevent loosening of nuts and bolts due to vibration or other dynamic forces. Unlike regular washers, which primarily distribute load and protect surfaces, lock washers incorporate features such as split designs, serrations, or conical shapes to create friction or bite into the mating surfaces. This additional friction helps maintain the tightness of the connection under varying conditions ¹.

Purpose of the Cummins 3974668 Lock Washer

The Cummins 3974668 Lock Washer is engineered to play a role in the operation and maintenance of commercial trucks by ensuring the integrity of bolted connections. It is designed to withstand the rigors of heavy-duty applications, where vibrations and dynamic loads are common. By preventing nuts and bolts from loosening, this lock washer helps maintain secure fastenings, which is crucial for the safety and performance of truck components.

Key Features

The Cummins 3974668 Lock Washer boasts several key features that enhance its performance. Its design includes a split configuration that provides additional friction when tightened, helping to keep the fastener in place. The material composition is chosen for its durability and resistance to corrosion, ensuring long-term reliability in demanding environments. Additionally, the lock washer is engineered to accommodate a range of bolt sizes, making it a versatile component for various applications.

Benefits of Using the Cummins 3974668 Lock Washer

Incorporating the Cummins 3974668 Lock Washer into truck assemblies offers several advantages. Its design contributes to improved vibration resistance, which is particularly beneficial in commercial trucks that experience significant road vibrations. The lock washer also enhances load distribution across the fastening area, reducing the risk of surface damage and ensuring even pressure. Furthermore, it increases fastening security by preventing unintended loosening, which can lead to component failure or safety hazards.

Installation Guidelines

Proper installation of the Cummins 3974668 Lock Washer is vital for its effectiveness. To install, place the lock washer under the nut or bolt head, ensuring that the split portion of the washer is oriented correctly to engage with the mating surfaces. Tighten the nut or bolt to the manufacturer’s specified torque settings to ensure the lock washer functions as intended. It is important to avoid over-tightening, which can damage the washer or the fastener, and to check for proper alignment to prevent uneven loading.

Troubleshooting and Maintenance

In truck maintenance, it is important to identify issues related to lock washers, such as loosening or damage. Regular inspections should be conducted to check for signs of wear or corrosion. If a lock washer appears damaged or fails to maintain a secure connection, it should be replaced promptly to prevent further issues. Routine checks and replacements ensure the ongoing reliability of bolted connections in commercial trucks.

Common Applications

The Cummins 3974668 Lock Washer finds typical uses in various commercial truck assemblies. It is commonly employed in engine components, chassis attachments, and other critical fastening points where vibration resistance and secure connections are paramount. Its versatility makes it suitable for a wide range of applications across different truck models and systems.

About Cummins

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 truck industry, Cummins is known for its commitment to quality, innovation, and customer satisfaction. The company’s extensive product range and history of excellence make it a trusted name in the industry.

Lock Washer 3974668 Compatibility with Cummins Engines

The Lock Washer part number 3974668, manufactured by Cummins, is designed to fit seamlessly with a variety of Cummins engines, ensuring secure fastening and preventing loosening due to vibrations. This part is integral to maintaining the integrity of bolted connections in these engines.

Engines 6B5.9 and 6C8.3

For the 6B5.9 and 6C8.3 engines, the Lock Washer 3974668 is specifically engineered to fit the critical components where vibration resistance is paramount. These engines, known for their robust performance, require reliable fastening solutions to maintain operational efficiency and safety. The washer’s design ensures that bolts remain tight, reducing the risk of failure under operational stress.

Engines K19, K38, and K50

Similarly, the Lock Washer 3974668 is compatible with the K19, K38, and K50 engines. These engines benefit from the washer’s ability to provide a secure lock, which is essential in high-stress environments where vibrations can otherwise lead to loosening of connections. The part’s precision engineering ensures it fits perfectly, providing the necessary stability and reliability for these engines.

Role of Part 3974668 Lock Washer in Engine Systems

The part 3974668 Lock Washer is an essential component in ensuring the stability and integrity of various engine system assemblies. When integrated into the engine panel, this lock washer prevents loosening of fasteners due to vibrations, thereby maintaining the structural integrity of the panel.

In the engine instrument setup, the lock washer plays a significant role in securing gauges and sensors. By preventing the screws from backing out, it ensures that the instruments remain accurately calibrated and firmly in place, which is vital for precise readings and reliable performance.

For the radiator, the lock washer is used in conjunction with bolts and nuts that hold the radiator in position. This application is particularly important as it ensures that the radiator remains securely mounted, allowing for efficient heat dissipation and maintaining optimal engine temperature.

Similarly, in the radiator mounting system, the lock washer is employed to secure the mounting brackets. This ensures that the radiator is held firmly in place, reducing the risk of displacement or damage during operation. The secure fit also aids in the consistent performance of the cooling system, contributing to the overall efficiency of the engine.

Conclusion

The Cummins 3974668 Lock Washer is a critical component in the maintenance and operation of commercial trucks, ensuring the integrity of bolted connections under demanding conditions. Its design, featuring a split configuration and durable material, provides enhanced vibration resistance and secure fastening. Proper installation and regular maintenance are essential to maximize its benefits and ensure the safety and performance of truck components. The compatibility of this part with various Cummins engines underscores its versatility and importance in engine systems, highlighting Cummins’ commitment to quality and reliability in the commercial truck industry.