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Parts of an Excavator. Although a wide range of machine types and equipment sizes are available, most hydraulic excavators operate on the same principle. They An excavator is a machine that is used for construction sites. It is a heavy duty equipment that can progressively excavate various types of soils . Excavators are heavy construction equipment consisting of a boom, dipper (or stick), This type of machine is now widely used throughout the world.Introduction. ? Type of Excavator Hydraulic hoe excavator are used to excavated Factors Affecting Excavators' Productivity. ? Types and