4983068
Starting Motor
Cummins®

Introduction

The Cummins 4983068 Starting Motor is a component designed for use in commercial trucks. Its purpose is to initiate engine operation by converting electrical energy into mechanical energy, which turns the engine over and allows for combustion to begin. The significance of this starting motor lies in its role in ensuring that the truck’s engine can be reliably started under various conditions, which is fundamental for the operation of commercial vehicles ¹.

Basic Concepts of Starting Motors

Starting motors, also known as starters, are electromechanical devices that play a role in initiating engine operation. They consist of several components, including the solenoid, the motor, and the drive mechanism. When the ignition key is turned, electrical current flows through the solenoid, which then engages the motor. The motor, in turn, rotates the drive mechanism, which is connected to the engine’s flywheel. This rotation allows the engine to turn over, initiating the combustion process. The conversion of electrical energy into mechanical energy is a key function of starting motors, enabling the engine to start ².

Purpose and Role of the 4983068 Starting Motor

The Cummins 4983068 Starting Motor is specifically designed to engage with the truck’s engine to facilitate starting. It ensures that the engine can be reliably ignited by providing the necessary mechanical force to turn the engine over. This starting motor is engineered to handle the demands of commercial truck engines, which often require more robust starting capabilities compared to smaller engines. Its role is vital in ensuring that the truck can be started efficiently and reliably, which is crucial for the operation of commercial vehicles.

Key Features

The Cummins 4983068 Starting Motor is characterized by several notable features. Its construction includes high-quality materials that are designed to withstand the rigors of commercial truck use. The motor is built with durable components that ensure longevity and reliable performance. Electrical specifications are tailored to meet the demands of commercial truck engines, providing efficient and powerful starting capabilities. Additionally, the design may incorporate unique technological advancements that enhance its functionality, such as improved heat dissipation features or advanced solenoid designs.

Benefits

The Cummins 4983068 Starting Motor offers several advantages. It provides improved starting performance, ensuring that the engine can be started quickly and reliably. Its durability is a significant benefit, as it is designed to withstand the harsh conditions often encountered in commercial truck operations. Efficiency is another key advantage, as the motor is engineered to convert electrical energy into mechanical energy with minimal loss, ensuring that the starting process is as efficient as possible. Additionally, any unique features incorporated into its design further enhance its functionality and reliability in commercial truck applications.

Troubleshooting and Maintenance

Common issues that may arise with the Cummins 4983068 Starting Motor include difficulty in starting the engine, unusual noises during operation, or a complete failure to engage. Diagnostic procedures for identifying problems may involve checking electrical connections, testing the solenoid, and inspecting the motor and drive mechanism for wear or damage. Recommended maintenance practices include regular inspection of electrical connections, cleaning the motor and solenoid to prevent buildup, and ensuring that all components are functioning correctly. Proper maintenance helps ensure optimal performance and longevity of the starting motor.

Cummins Overview

Cummins Inc. is a well-established company with a strong reputation in the automotive industry. Founded in 1919, Cummins has a long history of manufacturing high-quality components for commercial vehicles. The company is known for its commitment to innovation, quality, and customer satisfaction. Cummins’ products, including the 4983068 Starting Motor, are designed to meet the demanding requirements of commercial truck applications, ensuring reliable performance and durability.

Compatibility of Cummins Part 4983068 with Various Engine Models

The Cummins part 4983068, identified as a Starting Motor, is designed to be compatible with a range of Cummins engine models. This part is engineered to ensure reliable engine start-up across various engine configurations. Below is a detailed breakdown of the engine models with which this starting motor is compatible:

B6.7 and G Series Engines

• B6.7 G CMOH6.0 B125
• B119, ISB/ISD6.7 CM2150 SN

These engines, part of the B6.7 and G series, are equipped with the 4983068 starting motor. This motor is tailored to handle the specific demands of these engines, ensuring efficient and reliable start-up performance.

ISB/ISD Series Engines

• ISB/ISD4.5 CM2150
• ISB/ISD6.7 CM2150 SN

The ISB/ISD4.5 and ISB/ISD6.7 engines, both utilizing the CM2150 configuration, are also compatible with the 4983068 starting motor. This compatibility ensures that the motor can effectively manage the start-up requirements of these engines.

ISBE Series Engines

• ISBE CM2150
• ISBE4 CM850

Engines in the ISBE series, such as the ISBE CM2150 and ISBE4 CM850, are designed to work seamlessly with the 4983068 starting motor. This compatibility is crucial for maintaining the operational integrity of these engines.

QSB Series Engines

• QSB4.5 CM850 (CM2850)
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

The QSB series engines, including the QSB4.5, QSB6.7, and QSB7 models, are also compatible with the 4983068 starting motor. This compatibility ensures that the motor can handle the start-up requirements of these engines, regardless of their specific configurations.

Grouping of Compatible Engines

The compatibility of the 4983068 starting motor with various engine models can be grouped based on their series and configurations:

• B6.7 and G Series: B6.7 G CMOH6.0 B125, B119, ISB/ISD6.7 CM2150 SN
• ISB/ISD Series: ISB/ISD4.5 CM2150, ISB/ISD6.7 CM2150 SN
• ISBE Series: ISBE CM2150, ISBE4 CM850
• QSB Series: QSB4.5 CM850 (CM2850), QSB6.7 CM850 (CM2850), QSB7 CM2880 B117

This grouping highlights the broad compatibility of the 4983068 starting motor across different engine series and configurations, ensuring that it can be effectively used in a variety of applications.

Interaction with Engine Components

The Cummins 4983068 Starting Motor interacts with several key engine components to initiate engine operation:

1. Battery: The starting motor draws electrical power from the battery to generate the necessary torque for cranking the engine. A robust battery ensures that the motor receives sufficient voltage to perform effectively.
2. Starter Solenoid: This component acts as a switch that engages the starting motor with the flywheel. When the ignition key is turned, the solenoid activates, allowing the starting motor to mesh with the flywheel and begin the cranking process.
3. Flywheel: The starting motor engages with the flywheel to transfer rotational force to the crankshaft. The flywheel’s inertia helps in smoothing out the engine’s operation once it starts.
4. Crankshaft: The rotational force from the starting motor is transmitted to the crankshaft, which then begins to turn. This action initiates the pistons’ movement within the cylinders, starting the combustion process.
5. Ignition System: Once the crankshaft is in motion, the ignition system sparks the fuel-air mixture in the cylinders, igniting the combustion process that sustains engine operation.
6. Fuel System: As the engine cranks, the fuel system begins to deliver fuel to the cylinders. The starting motor’s role is complete once the engine starts and the combustion process takes over.
7. Alternator: After the engine starts, the alternator takes over the role of providing electrical power to the battery and the rest of the electrical system, relieving the battery from this task.

Operational Sequence

The operational sequence of the Cummins 4983068 Starting Motor is as follows:

1. Power Activation: When the ignition key is turned, electrical current flows from the battery to the starter solenoid.
2. Solenoid Engagement: The solenoid engages, connecting the starting motor to the flywheel.
3. Cranking Motion: The starting motor rotates, transferring rotational force to the flywheel and subsequently to the crankshaft.
4. Combustion Initiation: As the crankshaft turns, the pistons move, and the ignition system sparks the fuel-air mixture, initiating combustion.
5. Self-Sustaining Operation: Once combustion is established, the engine becomes self-sustaining, and the alternator begins to recharge the battery.

Understanding the role of the Cummins 4983068 Starting Motor within these components highlights its significance in the engine’s startup process. Proper maintenance and functionality of this part ensure reliable engine starts and overall vehicle performance.

Conclusion

The Cummins 4983068 Starting Motor is a critical component in the reliable operation of commercial truck engines. Its design and features ensure efficient and robust starting capabilities, making it compatible with a wide range of Cummins engine models. Proper maintenance and understanding of its interaction with other engine components are essential for ensuring optimal performance and longevity.