Which of these is NOT a main element of a correct setup for the backhoe?

The choice that identifies an element that is NOT part of a correct setup for the backhoe focuses on the importance of safety and precision in heavy equipment operation. Operating without checking layout lines highlights a neglect of necessary preparatory steps that contribute to effective and safe machine operation.

In any heavy equipment operation, ensuring that the equipment is positioned correctly for the task is vital. Not checking layout lines can lead to inaccuracies in the work being performed, resulting in potential safety hazards and costly mistakes.

On the other hand, the other choices emphasize essential practices for setting up a backhoe correctly. Positioning the machine for stockpiling ensures that material can be efficiently moved and stored. Ensuring the machine is level is crucial for stability and safe operation, especially when performing tasks that involve digging or lifting. Correct positioning of the hoe is fundamental to achieving the desired digging angle and depth, which contributes to the overall effectiveness of the operation.

Each of these elements contributes to operational efficiency and safety, making it clear that neglecting to check layout lines goes against these principles.