Which attachment requires the use of a tag line, a holding line, and a closing line to operate?

The clamshell attachment is designed for digging, scooping, and moving materials, typically in excavation or handling tasks. It features two hinged jaws that open and close, allowing it to grasp and lift loose materials like soil, gravel, or debris.

To operate a clamshell safely and effectively, the use of a tag line, a holding line, and a closing line is essential. The tag line maintains control of the clamshell from a safe distance, ensuring that the operator can guide its movement without interference. The holding line provides additional stability, preventing the attachment from swinging uncontrollably during operation. The closing line is critical for ensuring that the jaws of the clamshell close properly to securely grip the material being lifted.

These lines are important safety features in making sure that the clamshell operates in a controlled manner, preventing accidents and ensuring efficient handling of materials. This structure of operation is specific to clamshells and is not typically required for other attachments like buckets or grapples, which may operate under different handling risks and methods.