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Excavators are construction equipment used for digging and earth removal. The excavator consists of an extending limb, referred to as a boom, and a cab on a swiveling platform, which is called the house. Excavators can either come with wheels or tracks which are attached to the undercarriage. The house sits on the undercarriage and can pivot using hydraulic fluid; which accomplishes all movement and function. Excavator design comes from the evolution of the steam shovel.
An excavator is a self-propelled wheeled or crawler machine with an upper portion capable of revolution, that excavates, swings and discharges material by utilizing a bucket fixed to the telescoping boom, or boom and arm, without having to move the undercarriage or chassis at any time of the machines work period.
Some notable excavator manufacturers are the Bobcat Company, Case CE, Caterpillar Inc.,CNH Global, Doosan Infracore (Daewoo Heavy Industries & Machinery) - including Solar brand, Hitachi Construction Machinery, Hydrema, Hyundai Heavy Industries, John Deere, J. C. Bamford (JCB), Komatsu Limited, ThyssenKrupp, Kobelco, Kubota, Liebherr, Manitowoc Cranes, Mitsubishi Heavy Industries, New Holland, Orenstein & Koppel (O&K), Poclain, ST Kinetics, Terex Corporation and Volvo Construction Equipment.