Excavator. Sunday , April 29th , 2018 - 10:21:16 AM
Melroe was purchased by Clark Equipment Company in 1969 and then by Ingersoll-Rand in 1995. In 2007 Ingersoll Rand sold Clark Equipment Company to the Doosan Group of Korea along with the rest of its construction equipment group. The Clark Equipment Company now does business as Bobcat Company. Bobcat Company owns worldwide trademark registrations for its "Bobcat" name5 which only accurately refers to equipment manufactured by Bobcat Company.
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.
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.
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