3939694
Plain Union Elbow
Cummins®

The 3939694 Plain Union Elbow is a component manufactured by Cummins, a well-established name in the commercial truck industry. This part is utilized in the fluid systems of commercial trucks, where it plays a role in directing the flow of fluids. Understanding the function and application of the Plain Union Elbow is important for maintaining the efficiency and reliability of truck fluid systems.

Basic Concepts of Plain Union Elbow

A Plain Union Elbow is a type of fitting used in piping systems to change the direction of fluid flow by a specific angle, typically 90 degrees. Its basic design includes a central body with two connection points at perpendicular angles. This fitting allows for the redirection of fluid without causing significant disruption to the flow. Elbows are commonly used in piping systems to navigate around obstacles or to fit within the spatial constraints of an engine compartment ¹.

Purpose of the 3939694 Plain Union Elbow

The 3939694 Plain Union Elbow is designed to facilitate the smooth transition of fluid within a truck’s system. It plays a role in maintaining the integrity of the fluid pathway by allowing the fluid to change direction without causing turbulence or pressure loss. This is particularly important in systems where space is limited, and direct fluid paths are not feasible ².

Key Features

The 3939694 Plain Union Elbow is constructed with materials that offer durability and resistance to the corrosive effects of various fluids. It features connection types that ensure a secure fit within the system, reducing the likelihood of leaks. The design specifications of this elbow are tailored to enhance its functionality, ensuring that it can withstand the operational pressures and temperatures encountered in commercial truck applications ³.

Benefits

Incorporating the 3939694 Plain Union Elbow into truck fluid systems offers several advantages. It contributes to improved fluid dynamics by allowing for a smooth change in fluid direction. The design of this elbow also facilitates ease of installation, which can reduce downtime during maintenance procedures. Additionally, its construction materials and design contribute to lower maintenance requirements over time.

Installation Considerations

When installing the 3939694 Plain Union Elbow, it is important to follow guidelines that ensure proper alignment and secure connection. Torque specifications provided by the manufacturer should be adhered to in order to prevent over-tightening, which could damage the fitting, or under-tightening, which could lead to leaks. Compatibility with other system components must also be considered to ensure a cohesive and functional fluid system.

Troubleshooting Common Issues

Common issues with the 3939694 Plain Union Elbow may include leaks or blockages. Troubleshooting these problems involves inspecting the connections for proper torque and examining the elbow for signs of wear or damage. Addressing these issues promptly can help maintain the efficiency of the fluid system and prevent more significant problems from arising.

Maintenance Tips

Routine maintenance of the 3939694 Plain Union Elbow is important for ensuring long-term performance. This includes regular inspections for signs of wear, corrosion, or leaks. Cleaning the elbow as part of system maintenance can prevent buildup that may affect fluid flow. Knowing when to consider replacement based on the condition of the elbow and the operational demands of the truck is also a key aspect of maintenance.

Cummins: Manufacturer Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and fluid systems. With a history of innovation and a commitment to quality, Cummins has established a strong reputation in the commercial truck industry. The company’s focus on advancing technology and meeting the needs of its customers underscores its position as a trusted manufacturer of automotive components.

Cummins Engine Compatibility with Part 3939694

The Plain Union Elbow, part number 3939694, manufactured by Cummins, is a component in various engine configurations. This part is designed to fit seamlessly within the engine’s system, ensuring proper fluid flow and maintaining the integrity of the engine’s structure. Here is a detailed look at the compatibility of this part with the listed engines:

4B3.9 Series

• 4B3.9
• QSB3.9 30 CM550
• QSB3.9 CM2880 B138

6B5.9 Series

• 6B5.9
• QSB5.9 30 CM550

6C8.3 Series

• 6C8.3
• C8.3 G

B4.5 Series

• B4.5

B5.9 Series

• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556

C Series

• C GAS PLUS CM556
• L GAS PLUS CM556

ISB Series

• ISB CM550
• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

ISL Series

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250

L8.9 Series

• L8.9
• L8.9 CM2670 L134C

The Plain Union Elbow part 3939694 is engineered to fit these engines, ensuring compatibility across various models and configurations. This part is crucial for maintaining the fluid dynamics within the engine, preventing leaks, and ensuring the longevity of the engine’s performance.

Role of Part 3939694 Plain Union Elbow in Engine Systems

The 3939694 Plain Union Elbow is integral in facilitating the smooth operation of various engine systems by ensuring efficient fluid transfer and maintaining system integrity.

In the drive system, the Plain Union Elbow connects different sections of the drive lines, allowing for the uninterrupted flow of fluids or gases necessary for the operation of the drive components. This connection is vital for the consistent performance of the drive, as any disruption in fluid flow could lead to inefficiencies or failures.

Within the front gear train accessory, the Plain Union Elbow plays a role in linking the accessory to the main hydraulic lines. This ensures that the accessory receives the necessary hydraulic fluid to operate effectively. The elbow’s design allows for easy maintenance and replacement, reducing downtime during repairs.

For the front gear train accessory drive, the Plain Union Elbow is used to connect the drive to the hydraulic system. This connection is essential for transmitting the required hydraulic pressure to the drive, ensuring it functions correctly and efficiently.

In the context of the hydraulic pump adapter, the Plain Union Elbow is employed to join the adapter to the hydraulic lines. This connection is important for the adapter to regulate and direct the hydraulic fluid to the pump, maintaining the pump’s performance and longevity.

The hydraulic pump adapter kit often includes the Plain Union Elbow to ensure all components within the kit are properly connected. This setup is designed to simplify the installation process and ensure that the hydraulic system operates as intended.

For the hydraulic pump drive, the Plain Union Elbow is used to connect the drive to the hydraulic lines, ensuring that the pump receives the necessary fluid to operate. This connection is key to the efficient functioning of the pump drive, as it allows for the precise delivery of hydraulic fluid.

Lastly, in the mounting of the front gear train accessory, the Plain Union Elbow is utilized to connect the accessory to the hydraulic system. This ensures that the accessory is properly supplied with hydraulic fluid, which is necessary for its operation and the overall efficiency of the engine system.

Conclusion

The 3939694 Plain Union Elbow by Cummins is a vital component in the fluid systems of commercial trucks. Its role in directing fluid flow, maintaining system integrity, and ensuring efficient operation across various engine configurations underscores its importance. Proper installation, maintenance, and understanding of its function are essential for the longevity and reliability of truck fluid systems.