Engineering “Excavators are important and widely used equipment in the construction industry. Their general purpose is excavation but other than that they are also used for many purposes like heavy lifting, demolition, river dredging, cutting of trees, etc. Excavators contain a long arm and a cabinet. At the end of the long arm, the digging bucket is provided and a cabinet is a place provided for the machine operator. This whole cabin arrangement can be rotatable up to 360o which eases the operation. Excavators are available in both wheeled and tracked forms of vehicles.