thomas. Excavator. May 23rd , 2018.
The two main sections of an excavator are the undercarriage and the house. The undercarriage includes the blade (if fitted) tracks track frame and final drives which have a hydraulic motor and gearing providing the drive to the individual tracks and the house includes the operator cab counterweight engine fuel and hydraulic oil tanks. The house attaches to the undercarriage by way of a center pin. High pressure oil is supplied to the tracks hydraulic motors through a hydraulic swivel at the axis of the pin allowing the machine to slew 360° unhindered.
The Kellers uncle an equipment dealer for the Melroe Manufacturing Company based in Gwinner ND suggested that Melroe market the machines resulting in Melroe inviting the Kellers to exhibit at the 1958 Minnesota State Fair. Melroe introduced the four-wheeled M400 model "Skid-Steer Loader" in 1960 and began using "Bobcat" as a trade name for such products in 1962 on the 440-model loader. Les Melroe and advertising agent Lynn Bickett settled on the "Bobcat" name while exchanging name ideas during a drive between Minneapolis and Gwinner. Bickett and Sylvan Melroe developed the "tough quick and agile" slogan used in advertising the early loaders.
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.
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