Excavators are heavy construction equipment consisting of a boom, stick, bucket and cab on a rotating platform known as the house. The house sits atop an undercarriage with tracks or wheels. They are a natural progression from the steam shovels and often mistakenly called power shovels. All movement and functions of a hydraulic excavator are accomplished through the use of hydraulic fluid, with hydraulic cylinders and hydraulic motors. Due to the linear actuation of hydraulic cylinders, their mode of operation is fundamentally different from cable-operated excavators which uses winches and steel ropes to accomplish the movements.

Excavators are also called diggers, JCBs , mechanical shovels, or 360-degree excavators . Tracked excavators are sometimes called trackhoes by analogy to the backhoe. In the UK, wheeled excavators are sometimes known as rubber ducks. (source : wikipedia)

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