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. A cable-operated excavator uses winches and steel ropes to accomplish the movements. They are a
natural progression from the steam shovels and often 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.
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