thomas. Excavator. May 23rd , 2018.
Excavators (hydraulic) are heavy construction equipment consisting of a boom dipper (or stick) bucket and cab on a rotating platform known as the "house".1 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.2 Due to the linear actuation of hydraulic cylinders their mode of operation is fundamentally different from cable-operated excavators which use winches and steel ropes to accomplish the movements.
Before the 1990s all excavators had a long or conventional counterweight that hung off the rear of the machine to provide more digging force and lifting capacity. This became a nuisance when working in confined areas. In 1993 Yanmar launched the worlds first Zero Tail Swing excavator9 which allows the counterweight to stay inside the width of the tracks as it slews thus being safer and more user friendly when used in a confined space. This type of machine is now widely used throughout the world.
Attached to the end of the boom is the stick (or dipper arm). The stick provides the digging force needed to pull the bucket through the ground. The stick length is optional depending whether reach (longer stick) or break-out power (shorter stick) is required.
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