Which feature is added to enable operation of the deep digging arm?

The addition of an additional counterweight and control selection is crucial for enabling the operation of a deep digging arm on an excavator. When a deep digging arm is utilized, the center of gravity of the machine shifts significantly due to the extended reach and increased leverage that occurs during deep excavation tasks.

To maintain stability and safety during operation, a counterweight is added to offset the shift in the center of gravity. This helps prevent tipping or instability that can arise when the deep digging arm is extended or fully articulated. Additionally, control selection adjustments may be required to optimize the machine's performance and ensure that the operator can effectively handle the unique dynamics of operating with a deeper digging arm.

By incorporating both of these features—an additional counterweight to enhance stability and adjustments to control systems for precise operation—the excavator is better equipped to handle the demands of deep excavations.