R 408.41521 Definition.

Rule 1521. “Excavator”, for the purposes of this standard, means mobile hydraulic excavator, either crawler or rubber-tire mounted. An excavator is a self-propelled machine with an upper structure capable of continuous rotation and which digs, elevates, swings, and dumps material by action of the boom and arm or telescoping boom with bucket. Equipment that does not rotate 360 degrees, such as rubber-tired backhoe, is not considered to be an excavator.