3936139
Accessory Drive Gear
Cummins®

Introduction

The Cummins Accessory Drive Gear 3936139 is a component designed for use in commercial trucks. It plays a role in the operation of these vehicles by facilitating the transfer of power from the engine to various auxiliary systems. This gear is integral to ensuring that essential engine accessories receive the necessary power to function correctly, thereby contributing to the overall efficiency and performance of the truck.

Basic Concepts of Accessory Drive Gear

An Accessory Drive Gear is a mechanical component that transmits power from the engine to various accessories such as the alternator, water pump, and air conditioning compressor. It operates by engaging with a corresponding gear on the accessory, allowing it to rotate and perform its function. The efficiency and reliability of the accessory drive system are vital for the proper operation of the vehicle, as these accessories play significant roles in engine cooling, electrical power generation, and climate control ¹.

Purpose of Cummins Accessory Drive Gear 3936139

The Cummins Accessory Drive Gear 3936139 is specifically designed to drive key components within the truck’s engine system. It engages with the engine’s crankshaft to transfer power to accessories such as the alternator, which generates electrical power, and the water pump, which circulates coolant through the engine to maintain optimal operating temperatures. By ensuring these accessories receive the necessary power, the Accessory Drive Gear contributes to the engine’s overall performance and reliability.

Key Features

The 3936139 Accessory Drive Gear is constructed from high-quality materials to ensure durability and longevity. Its design incorporates precise engineering to facilitate smooth operation and efficient power transfer. Unique characteristics of this gear include its robust construction, which is capable of withstanding the demanding conditions of commercial truck operation, and its compatibility with a range of Cummins engine models.

Benefits

The use of the 3936139 Accessory Drive Gear offers several advantages. It enhances engine efficiency by ensuring that accessories receive consistent and reliable power. This contributes to improved vehicle performance and reliability. Additionally, the gear’s durable construction and precise engineering result in a component that requires minimal maintenance, offering long-term value to fleet operators ².

Installation and Integration

Installing the 3936139 Accessory Drive Gear involves several steps to ensure proper integration with the engine system. It is important to verify compatibility with the specific engine model to ensure a seamless fit. The installation process requires careful alignment with the crankshaft and secure fastening to prevent any movement that could affect performance. Following manufacturer guidelines for installation is recommended to achieve optimal results.

Maintenance and Care

To ensure the longevity and optimal performance of the 3936139 Accessory Drive Gear, regular maintenance is advised. This includes periodic inspections for signs of wear or damage, ensuring that all connections are secure, and following recommended service intervals for replacement or repair. Proper maintenance not only extends the life of the gear but also contributes to the overall reliability of the vehicle.

Troubleshooting Common Issues

Common issues associated with Accessory Drive Gears can include noise, vibration, or a decrease in accessory performance. These problems may arise from wear and tear, improper installation, or lack of maintenance. Troubleshooting steps may involve inspecting the gear for damage, ensuring proper alignment and fastening, and addressing any underlying issues with the accessories it drives. Regular maintenance can help prevent many of these issues.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company’s commitment to excellence is reflected in its wide range of products, which are designed to meet the demanding requirements of commercial applications. Cummins’ focus on quality, performance, and reliability makes it a preferred choice for fleet operators worldwide.

Accessory Drive Gear 3936139 Compatibility with Cummins Engines

The Accessory Drive Gear 3936139, manufactured by Cummins, is a critical component that ensures the proper functioning of various engine accessories. This part is designed to fit a range of Cummins engines, providing a reliable and efficient means of transferring power to essential systems such as the alternator, water pump, and air conditioning compressor.

ISC Series Engines

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

The Accessory Drive Gear 3936139 is compatible with the ISC series engines, which are known for their robust performance and reliability. These engines are often used in heavy-duty applications, and the accessory drive gear ensures that the necessary accessories operate smoothly and efficiently.

ISL Series Engines

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

The ISL series engines benefit from the Accessory Drive Gear 3936139, which is engineered to handle the specific demands of these models. Whether used in on-highway or vocational applications, this part ensures that the engine’s accessories receive the power they need to function correctly.

QSC and QSL Series Engines

• QSC8.3 CM2880 C102
• QSC8.3 CM554
• QSC8.3 CM850 (CM2850)
• QSC9 CM2250 / QSL9 CM2250
• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM554
• QSL9 CM850 (CM2850)
• QSL9.3 CM2880 L113

The Accessory Drive Gear 3936139 is also compatible with the QSC and QSL series engines. These engines are designed for a variety of applications, from construction to power generation, and the accessory drive gear ensures that the engine’s accessories are powered effectively, contributing to the overall performance and longevity of the engine.

L Series Engines

• L GAS PLUS CM556
• L8.9
• L8.9 CM2670 L134C

The L series engines, which are often used in agricultural and construction equipment, are also compatible with the Accessory Drive Gear 3936139. This part ensures that the engine’s accessories receive the necessary power, enhancing the reliability and efficiency of these engines in demanding environments.

Accessory Drive Gear (Part 3936139) Component Usage

The Accessory Drive Gear (Part 3936139) is integral to the efficient operation of several engine systems. Its primary function is to transfer rotational power from the engine’s crankshaft to various accessories, ensuring they operate in sync with the engine’s performance.

Drive System Integration

In the drive system, the Accessory Drive Gear is responsible for transmitting power to the front gear train accessory. This setup ensures that the accessory components receive the necessary rotational force to function correctly. The gear’s precise teeth alignment and robust construction are designed to handle the continuous load and varying speeds typical in engine operations.

Front Gear Train Accessory

The front gear train accessory relies on the Accessory Drive Gear to maintain consistent power delivery. This accessory often includes components like the hydraulic pump drive, which requires a stable and reliable power source to operate efficiently. The gear’s role here is to ensure that the hydraulic pump receives the necessary drive force to generate the hydraulic pressure needed for various engine functions.

Hydraulic Pump Drive

Within the hydraulic system, the Accessory Drive Gear plays a significant role by driving the hydraulic pump. This pump is essential for maintaining the hydraulic pressure required for actuating various engine components, such as valves and control systems. The consistent and smooth operation of the hydraulic pump is dependent on the reliable power transfer from the Accessory Drive Gear.

Mounting and Stability

The mounting of the Accessory Drive Gear is designed to provide stability and reduce vibrations during operation. Proper mounting ensures that the gear remains aligned with the front gear train accessory, minimizing wear and tear on both components. This stability is vital for the longevity and efficiency of the entire drive system.

Conclusion

In summary, the Accessory Drive Gear (Part 3936139) is a key component in the drive system, ensuring that power is efficiently transferred to the front gear train accessory and the hydraulic pump drive. Its reliable operation is essential for the smooth functioning of these interconnected engine systems.