3924725
Banjo Connector Screw
Cummins®

The 3924725 Banjo Connector Screw is a component manufactured by Cummins, designed for use in commercial trucks. This article provides an overview of this Cummins part, its function, key features, benefits, and maintenance suggestions.

Basic Concepts of Banjo Connector Screws

A banjo connector screw is a type of fitting used in hydraulic and fuel systems to connect hoses or pipes. It consists of a bolt with an integrated banjo fitting, which allows for secure and leak-proof connections. The design includes a flat surface with holes for the hose or pipe to pass through, sealed by washers on either side ¹.

Function and Role in Truck Operation

The 3924725 Banjo Connector Screw plays a role in the hydraulic and fuel systems of commercial trucks by providing a secure connection point for hoses and pipes. It ensures that fluids are transferred efficiently and without leaks, contributing to the overall reliability and performance of the truck’s systems ².

Key Features

• Integrated Design: Combines a bolt and banjo fitting into one component.
• Secure Connection: Utilizes washers to create a leak-proof seal.
• Versatility: Compatible with various hose and pipe sizes.
• Durability: Constructed from high-quality materials to withstand high pressure and temperature.

Benefits

• Reliability: Ensures secure and leak-free connections in critical systems.
• Ease of Installation: Simplifies the process of connecting hoses and pipes.
• Maintenance: Designed for long-term use with minimal maintenance requirements.

Troubleshooting and Maintenance

Regular inspection of the banjo connector screw is recommended to ensure it remains in good condition. Signs of wear, corrosion, or leaks should be addressed promptly. Maintenance may include tightening connections, replacing washers, or, in some cases, replacing the connector screw entirely ³.

Compatibility of 3924725 Banjo Connector Screw

The 3924725 Banjo Connector Screw is designed to fit a variety of Cummins engines, ensuring a secure connection for hydraulic or fuel lines. Below is a detailed breakdown of the engines with which this part is compatible:

Cummins Engines Compatibility

• 4B3.9, 6B5.9, 6C8.3, B3.3, B6.7 CM2670, B153B: These engines, primarily used in various industrial and agricultural applications, benefit from the reliable connection provided by the 3924725 screw.
• ISB (Chrysler), ISB CM2150, ISB CM550, ISB CM850, ISB6.7 CM2250, ISB6.7 CM2350 B101: The ISB series engines, known for their use in heavy-duty trucks and industrial applications, are compatible with the 3924725 screw.
• ISBE CM2150, ISBE4 CM850, ISC CM2150, ISC CM554, ISC CM850, ISC8.3 CM2250: The ISBE and ISC engines, which are often found in on-highway and vocational trucks, are also compatible with the 3924725 screw.
• ISG11 CM2880 G108, ISG12 CM2880 G107, ISG12 G CMOH6.0 G111: These engines, typically used in medium-duty trucks and industrial applications, require the 3924725 screw for maintaining secure connections.
• ISL CM2150, ISL CM554, ISL G CM2180, ISL9 CM2150 SN, ISL9 CM2250: The ISL series engines, which are widely used in both on-highway and vocational trucks, are compatible with the 3924725 screw.

Role of 3924725 Banjo Connector Screw in Engine Systems

The 3924725 Banjo Connector Screw is an essential component in various engine systems, facilitating the secure connection of different parts and ensuring the efficient transfer of fluids and gases. Here’s how it integrates with several key components:

Fuel System Integration

• Fuel Filter Plumbing: The Banjo Connector Screw is used to connect the fuel filter to the fuel lines, ensuring a leak-free passage of fuel from the tank to the engine.
• Fuel Inlet Fitting: It secures the fuel inlet fitting to the fuel rail, maintaining consistent fuel pressure and flow.
• Fuel Pump Coupling: This screw is vital in connecting the fuel pump to the fuel lines, ensuring reliable fuel delivery to the engine.
• Fuel System Primer: It aids in the secure attachment of the primer to the fuel system, assisting in easy bleeding of air from the lines.

Air and Lubrication Systems

• Air Compressor: In air compressor systems, the Banjo Connector Screw ensures a tight seal between the compressor and its plumbing, preventing air leaks.
• Lubricating Oil Supply Tube: It connects the oil supply tube to the engine, guaranteeing a steady flow of lubricant to critical moving parts.

Engine Control and Breather Systems

• Engine Control Module Plumbing: The screw plays a role in connecting sensors and actuators to the Engine Control Module (ECM), ensuring accurate data transmission and control signals.
• Crankcase Breather Arrangement: It secures the breather lines, allowing safe venting of gases from the crankcase while preventing contamination.

Accessory and Drain Systems

• Rear Gear Train Accessory Drive: The Banjo Connector Screw is used to connect accessory drives, ensuring they receive the necessary fluid or gas supply.
• Drain Location: It facilitates the secure attachment of drain lines, allowing for efficient fluid removal during maintenance procedures.

Comprehensive System Support

• Fuel Tube Kit: The screw is integral in assembling fuel tube kits, ensuring all connections are secure and leak-free.
• Lower Engine Gasket Set: It assists in the installation of gaskets by providing a reliable connection point for fluid lines.
• Flywheel Housing: The screw helps in connecting fluid lines to the flywheel housing, ensuring proper lubrication and cooling.

Conclusion

In summary, the 3924725 Banjo Connector Screw is a versatile component that enhances the functionality and reliability of various engine systems by providing secure and leak-free connections. Regular maintenance and inspection are crucial to ensure its continued performance and the overall efficiency of the engine systems it supports.