The hydraulic excavator (digger) is a large vehicle that is designed for excavation and demolition purpose. Hydraulic excavators consist of a chassis, boom, bucket, and move via tracks or wheels. They range in size and function, an example of which is the similar but smaller mini excavator. All versions are generally designed for the same purpose. Hydraulic excavators weight between 3,000 and 2 million pounds and their speed ranges between 19 HP and 4,500 HP.