3935645
Accessory Drive Shaft
Cummins®

The Cummins Accessory Drive Shaft, part number 3935645, is a component designed for use in commercial trucks. It plays a significant role in the operation of these vehicles by facilitating the transfer of power from the engine to various accessories. Understanding its function and importance can help fleet operators and technicians maintain and optimize truck performance.

Basic Concepts of Accessory Drive Shafts

An accessory drive shaft is a mechanical component that transmits rotational force from the engine to various accessories such as alternators, water pumps, and air conditioning compressors. It operates within the engine system by connecting to the crankshaft and distributing power to these accessories via a series of pulleys and belts. The efficient operation of the accessory drive shaft ensures that all connected components receive the necessary power to function correctly ¹.

Purpose of the Cummins Accessory Drive Shaft Part #3935645

The Cummins Accessory Drive Shaft, part number 3935645, facilitates the transfer of power from the engine to various accessories. This transfer enables accessories to perform their functions, such as generating electricity, cooling the engine, and providing climate control. The drive shaft’s reliable operation is integral to maintaining the overall efficiency and functionality of the truck’s engine system ².

Key Features

The Accessory Drive Shaft, part number 3935645, is constructed from high-quality materials to ensure durability and performance. Its design includes precision-machined surfaces and robust connections to the crankshaft and accessories. These features contribute to the drive shaft’s ability to withstand the rigors of commercial truck operation, providing a reliable power transfer mechanism ³.

Benefits

The Cummins Accessory Drive Shaft offers several advantages, including improved efficiency and reliability. By ensuring a consistent power transfer to engine accessories, it helps maintain optimal engine performance. Additionally, its durable construction can lead to reduced maintenance requirements and potential cost savings for fleet operators over time.

Installation and Integration

Proper installation of the Cummins Accessory Drive Shaft within a truck’s engine system involves aligning it with the crankshaft and connecting it to the appropriate accessories via pulleys and belts. It is important to follow manufacturer guidelines to ensure correct tension and alignment, which are critical for the efficient operation of the drive shaft and connected accessories.

Troubleshooting and Maintenance

Common issues with accessory drive shafts can include wear, misalignment, or belt slippage. Regular inspection and maintenance can help identify these problems early. Diagnostic procedures may involve checking for unusual noises, inspecting belt tension, and ensuring proper alignment. Maintenance practices such as lubrication and periodic replacement of worn components can enhance the drive shaft’s performance and longevity.

Performance Enhancements

The Cummins Accessory Drive Shaft contributes to overall engine performance by ensuring that accessories receive the necessary power to operate efficiently. This can lead to enhancements in power delivery, fuel efficiency, and operational smoothness, as accessories function optimally without placing undue stress on the engine.

Compatibility with Cummins Engines

The Accessory Drive Shaft, part number 3935645, is designed to fit a variety of Cummins engines. This part is integral to the engine’s operation, providing a connection between the engine’s crankshaft and various ancillary components such as the alternator, water pump, and air conditioning compressor.

Small Bore Engines

• 4B3.9
• 6B5.9
• B4.5
• B5.9 G
• B5.9 GAS PLUS CM556
• QSB3.9 30 CM550
• QSB3.9 CM2880 B138
• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB5.9 CM2880 B139
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)

Medium Bore Engines

• 6C8.3
• C8.3 G
• L8.9
• L8.9 CM2670 L134C

Large Bore Engines

• B6.7 CM2670 B164C
• F3.8 CM2350 F128C
• ISB CM550
• ISC CM554
• ISL CM554
• ISX CM570
• QSB6.7 CM2350 B105

Each of these engines, regardless of their size or specific model, relies on the Accessory Drive Shaft 3935645 to function correctly. Cummins has designed this part to meet the rigorous demands of their engines, providing a reliable and durable solution for a wide range of applications.

Understanding the Role of Part 3935645 Accessory Drive Shaft in Engine Systems

The Accessory Drive Shaft, identified by part number 3935645, is an integral component in the efficient operation of various engine systems. Its primary function is to transmit rotational force from the engine to multiple accessories, ensuring they operate in unison with the engine’s rhythm.

Integration with the Drive System

Within the drive system, the Accessory Drive Shaft connects to both the front and rear gear train accessories. This connection allows for the seamless transfer of power, enabling accessories such as alternators, air conditioning compressors, and power steering pumps to function effectively. The shaft’s design ensures minimal power loss during transmission, maintaining the efficiency of the drive system.

Interaction with Gear Train Accessories

The front and rear gear train accessories rely on the Accessory Drive Shaft for their operation. These accessories are essential for the engine’s ancillary functions, including electrical power generation and fluid circulation. The shaft’s precise engineering ensures that these accessories receive the necessary rotational force to perform their tasks without interruption.

Role in Hydraulic Systems

In hydraulic systems, the Accessory Drive Shaft plays a significant role by connecting to the hydraulic pump adapter and the hydraulic pump drive. This connection is vital for the operation of hydraulic pumps, which are responsible for generating the hydraulic pressure needed for various engine functions. The shaft’s robust construction ensures that it can handle the demands of hydraulic systems, providing reliable performance under pressure.

Mounting Considerations

The mounting of front and rear gear train accessories is another area where the Accessory Drive Shaft demonstrates its importance. Proper mounting is essential for the stability and alignment of these accessories, directly impacting their performance and longevity. The shaft’s design facilitates secure mounting, ensuring that accessories are held in place and operate within their intended parameters.

Compatibility with Kits and Adapters

When it comes to hydraulic pump adapter kits, the Accessory Drive Shaft’s compatibility is paramount. These kits often include various adapters designed to interface with different hydraulic systems. The shaft’s universal design allows it to work with a wide range of adapters, providing flexibility in engine system configurations and upgrades.

Conclusion

In summary, the Accessory Drive Shaft (part 3935645) is a versatile and essential component in engine systems, facilitating the efficient operation of drive systems, gear train accessories, and hydraulic components. Its role in transmitting power and ensuring the proper mounting and compatibility of accessories underscores its importance in maintaining the overall performance and reliability of engine systems.