The excavators are heavy duty construction machines. They are used for digging the ground or carrying large objects. There are usually two tracks on the frame of the vehicle. The operator sits on the cabin and controls the excavator. There is a platform, rotating at the angles of 180 or 360 degrees around the tracks. One set of controls drives the vehicles front or back while the other set controls the arm and the rolling digger. The control of the machine is made via the hydraulic fluid, hydraulic cylinders and the hydraulic motors.
The size of the excavators may vary depending on the work to be done. Some of them feature wheels instead of tracks.