. SAFETY PRECAUTIONS FOR OPERATION PROHIBITED OPERATIONS It is dangerous to excavate the bottom of a rock face. Never do this. It is dangerous to use the bucket or lift arm for crane operations, so do not carry out such operations. Do not pass the bucket over the head of other workers or over the operator's seat of dump trucks or other hauling equipment. The load may spill or the bucket may hit the dump truck and cause serious personal injury or death. 2 - 26