thomas. Excavator. May 23rd , 2018.
Hydraulic excavators usually couple engine power to (commonly) three hydraulic pumps rather than to mechanical drivetrains. The two main pumps supply oil at high pressure (up to 5000 psi) for the arms swing motor track motors and accessories while the third is a lower pressure (~700 psi) pump for pilot control of the spool valves; this third circuit allows for reduced physical effort when operating the controls. Generally the 3 pumps used in excavators consist of 2 variable displacement piston pumps and a gear pump. The arrangement of the pumps in the excavator unit changes with different manufacturers using different formats.
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.
Bobcat Company is an American-based manufacturer of farm and construction equipment part of Doosan Group of South Korea. Its American headquarters is in West Fargo North Dakota USA formerly in Gwinner North Dakota. Its European headquarters moved in 2017 from Waterloo Belgium to Dobris (near Prague) in Czech Republic where Bobcat operates one of its European manufacturing plants. It was a subsidiary of the Ingersoll Rand Company from 1995 until July 2007 when it was sold for US$4.9 billion to Doosan Infracore.1 The company sells skid steer loaders compact excavators compact utility vehicles compact tractors and other small hydraulic equipment under the Bobcat brand name. It is one of the few major manufacturing companies operating in North Dakota.
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