What is the first action an operator should take when changing attachments on an excavator?

The first action an operator should take when changing attachments on an excavator is to safely lower the existing attachment. This step is crucial because it ensures that the attachment is stable and secure before any further actions are taken. By lowering the attachment to a safe position, the operator minimizes the risk of accidents or injuries associated with a suspended or unstable attachment.

Lowering the existing attachment allows the operator to maintain control and ensure that it is out of the way before disconnecting any hydraulic lines or removing the attachment. This foundational step sets the stage for safely proceeding with the attachment change process, paving the way to implement subsequent steps more effectively and securely.