thomas. Excavator. May 23rd , 2018.
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.
Hydraulic excavator capabilities have expanded far beyond excavation tasks with buckets. With the advent of hydraulic-powered attachments such as a breaker a grapple or an auger the excavator is frequently used in many applications other than excavation. Many excavators feature a quick coupler for simplified attachment mounting increasing the machines utilization on the jobsite. Excavators are usually employed together with loaders and bulldozers. Most wheeled compact and some medium-sized (11 to 18-tonne) excavators have a backfill (or dozer) blade. This is a horizontal bulldozer-like blade attached to the undercarriage and is used for levelling and pushing removed material back into a hole.
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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