1.It is forbidden to use a bucket to crush solid objects; if large rocks or hard objects are encountered, they should be removed first and then continue to work; it is forbidden to excavate rocks of grade 5 or above that have been blasted.

2.It is forbidden to arrange the excavator to operate in the upper and lower excavation sections at the same time; when the excavator moves in the working face, the ground should be leveled first, and the obstacles in the passage should be removed.

3.It is forbidden to jack up the excavator with the full extension of the bucket cylinder. When the bucket does not leave the ground, the excavator cannot run sideways or rotate.

4.It is forbidden to drag other objects laterally with the excavator arm; hydraulic excavators cannot use the impact method for excavation.