To what depth can the deep digging attachment arm allow excavation?

The deep digging attachment arm of a hydraulic excavator is specifically designed to enhance the machine's capability for reaching greater depths during excavation tasks. The correct answer indicates that a depth of 40 feet (12.19 meters) is achievable with this attachment. This depth allows operators to effectively reach deeper soil layers and excavate for various applications, such as foundations, pipelines, or other underground structures.

In practice, achieving this depth involves not only the design of the attachment itself but also the hydraulic capabilities of the excavator. The mechanics of the hydraulic system must work in tandem with the arm's design to ensure stability and efficiency while digging at such depths. Additionally, 40 feet is a commonly referenced maximum depth for many industrial excavating tasks, making it a practical choice for operators requiring versatility in their equipment for projects that involve deep excavation.

The other options presented—depths of 30 feet, 35 feet, and 45 feet—reflect either lower capabilities or exceed typical operational limits for most hydraulic excavators with deep digging attachments, leading to the conclusion that 40 feet is both a feasible and optimal depth for operations involving such equipment.