The Caterpillar E120B excavator is a mid-sized machine that was manufactured in the 1990s and belongs to Caterpillar's E Series lineup. It has been widely used in various construction and earthmoving applications. Please note that the information provided here is based on general knowledge, and specific details may vary depending on the machine's configuration and condition.

Here are some key features and specifications commonly associated with the Cat E120B:

1. Size and Power: The Cat E120B is considered a mid-sized excavator, offering a balance between power and maneuverability. Its size makes it suitable for a range of applications, including residential construction and light to medium-duty excavation projects.
2. Engine: The Cat E120B is typically equipped with a Caterpillar 3114 engine that delivers reliable power and performance. The engine is known for its durability and ability to handle various tasks.
3. Operating Weight: The operating weight of the Cat E120B can vary depending on the specific configuration and any additional attachments. Generally, it falls within the range of 11 to 13 metric tons.
4. Bucket Capacity: The bucket capacity of the Cat E120B can vary based on the configuration and attachments. It is typically available in a range of 0.5 to 0.8 cubic meters, providing capacity for medium-scale excavation and material handling tasks.
5. Reach and Digging Depth: The Cat E120B typically offers a reach of around 7 to 8 meters and a digging depth of approximately 4 to 5 meters. These specifications make it suitable for a variety of light to medium-duty excavation projects.
6. Hydraulic System: The Cat E120B is equipped with a hydraulic system that provides efficient operation of the boom, arm, and bucket. It offers good digging power and control for productive performance.
7. Operator Comfort: The Cat E120B is designed with operator comfort in mind. It features a comfortable and ergonomic cab with adjustable controls, good visibility, and reduced noise levels. The operator's working environment is optimized for improved productivity and reduced fatigue.

The Cat E120B can be used in a variety of applications, including:

1. General Excavation: It is well-suited for general excavation tasks, such as digging trenches, foundations, and basements. Its power and reach allow it to handle medium-scale projects efficiently.
2. Construction and Site Development: The Cat E120B can contribute to construction and site development projects, including land clearing, grading, and backfilling. It can assist in various tasks that require medium-sized excavation equipment.
3. Utilities and Infrastructure: It can be used for installing utilities, such as water and sewer lines, as well as assisting in road construction and infrastructure projects.