3917990
Flexible Hose
Cummins®

Introduction

The Cummins 3917990 Flexible Hose is a component designed for use in commercial trucks. It facilitates the transfer of fluids or gases between different parts of the truck. This hose is engineered to withstand the demanding conditions typical of heavy-duty applications, ensuring reliable performance and longevity.

Basic Concepts of Flexible Hoses

Flexible hoses are used extensively in automotive and industrial applications to convey fluids and gases. They are preferred over rigid pipes due to their ability to accommodate movement and vibration, which are common in dynamic systems like those found in trucks. Flexible hoses are constructed from materials that offer durability, flexibility, and resistance to various environmental factors, allowing them to perform effectively under a range of conditions ¹.

Purpose of the Cummins 3917990 Flexible Hose

The Cummins 3917990 Flexible Hose is specifically designed to transport fluids or gases within the truck’s system. It connects critical components, ensuring a secure and efficient flow. The hose is tailored to handle the specific pressures and temperatures associated with its application, contributing to the overall functionality and reliability of the truck’s system ².

Key Features

The Cummins 3917990 Flexible Hose boasts several key features that enhance its performance and durability. It is made from high-quality materials that provide excellent flexibility and resistance to wear and tear. The hose’s design includes reinforced layers to withstand high pressure and temperature variations, ensuring it remains intact and functional under demanding conditions. Additionally, its construction allows for easy installation and maintenance, making it a practical choice for commercial truck applications ³.

Benefits

The use of the Cummins 3917990 Flexible Hose offers several advantages. Its flexibility reduces stress on connected components, minimizing the risk of damage or failure. This hose also contributes to enhanced safety by preventing leaks, which can be hazardous in a commercial truck environment. Furthermore, its durable construction ensures long-term reliability, reducing the need for frequent replacements and maintenance.

Installation Considerations

When installing the Cummins 3917990 Flexible Hose, it is important to follow guidelines to ensure proper alignment and secure fitting. This involves checking for compatibility with the truck’s system and using appropriate methods to secure the hose in place. Careful installation helps maintain the integrity of the hose and ensures optimal performance.

Maintenance and Troubleshooting

Regular maintenance of the Cummins 3917990 Flexible Hose is key to its longevity and performance. This includes inspecting the hose for signs of wear, such as cracks or leaks, and addressing any issues promptly. Troubleshooting common problems may involve tightening connections, replacing worn sections, or adjusting the hose to reduce stress on the system.

Performance in Various Conditions

The Cummins 3917990 Flexible Hose is designed to perform reliably under a variety of operating conditions. It can withstand extreme temperatures, high pressure, and vibration, making it suitable for the demanding environments encountered by commercial trucks. Its robust construction ensures consistent performance, contributing to the truck’s overall efficiency and safety.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions. With a history spanning over a century, Cummins has established a strong reputation in the commercial truck industry for producing high-quality, reliable components. The company’s extensive product range includes engines, filtration systems, and aftermarket parts, all designed to meet the needs of heavy-duty applications.

Cummins Flexible Hose 3917990 Compatibility

The Cummins Flexible Hose part number 3917990 is designed to fit a variety of Cummins engines, ensuring a secure and flexible connection for various fluid transfer applications. Here is a detailed breakdown of the engines that this part is compatible with:

ISC Series Engines

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

ISL Series Engines

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

QSC Series Engines

• QSC8.3 CM2880 C102
• QSC8.3 CM554
• QSC8.3 CM850(CM2850)

QSL Series Engines

• QSL8.9 CM2150 L141
• QSL9 CM554
• QSL9 CM850(CM2850)

Other Cummins Engines

• 4B3.9
• 6B5.9
• 6C8.3
• C8.3 G
• L GAS PLUS CM556
• L8.9
• L8.9 CM2670 L134C
• QSM11 CM570

This flexible hose is engineered to provide durability and flexibility, making it suitable for the demanding environments these engines operate in. It ensures a reliable connection, minimizing the risk of leaks and maintaining the efficiency of fluid transfer systems.

Role of Part 3917990 Flexible Hose in Engine Systems

The part 3917990 Flexible Hose is integral to the efficient operation of various engine systems. It facilitates the transfer of fluids and gases between different components, ensuring seamless functionality and performance.

Compressor and Air Systems

In compressor and air systems, the flexible hose allows for the dynamic transfer of compressed air. This is essential for maintaining the pressure required for efficient operation of pneumatic tools and systems. The flexibility of the hose accommodates the movement and vibrations inherent in these systems, reducing the risk of leaks and system failures.

Drive and Front Gear Train Accessory

When integrated with the drive and front gear train accessory, the flexible hose plays a role in transmitting fluids that lubricate and cool moving parts. This ensures that the gear train operates smoothly, reducing wear and tear and enhancing the longevity of the accessory.

Heat Exchanger and Lift Pump

In heat exchanger applications, the flexible hose is used to circulate coolant or other heat transfer fluids. This is vital for maintaining optimal operating temperatures within the engine. Similarly, in lift pump systems, the hose ensures a consistent flow of fuel or other fluids, which is necessary for the reliable operation of the pump.

Mounting and Plumbing

For mounting and plumbing applications, the flexible hose provides a versatile solution for connecting various components within the engine system. Its flexibility allows for easier installation and maintenance, accommodating the spatial constraints often found in engine compartments.

Keel Cooler and Corrosion Resistance

In keel cooler systems, the flexible hose is used to circulate coolant through the keel cooler, which is essential for dissipating heat from the engine. The hose’s resistance to corrosion ensures durability in harsh environments, maintaining the integrity of the cooling system over time.

Resistor and Overall System Integration

The flexible hose also plays a supporting role in systems involving resistors, where it may be used to manage the flow of fluids that help in temperature regulation or other functions. Its integration into the overall engine system ensures that all components work in harmony, contributing to the engine’s efficiency and reliability.

Conclusion

The Cummins 3917990 Flexible Hose is a critical component in the operation of commercial trucks, offering durability, flexibility, and reliable performance under demanding conditions. Its compatibility with a wide range of Cummins engines and its role in various engine systems underscore its importance in maintaining the efficiency and safety of these vehicles.