thomas. Excavator. May 23rd , 2018.
Modern hydraulic excavators come in a wide variety of sizes. The smaller ones are called mini or compact excavators.7 For example Caterpillars smallest mini-excavator weighs 2060 pounds (930 kg) and has 13 hp; their largest model is the largest excavator available (a record previously held by the Orenstein & Koppel RH400) the CAT 6090 which weighs in excess of 2160510 pounds (979990 kg) has 4500 hp and a bucket as large as 52.0 m³.
In the 1950s Louis and Cyril Keller operated Keller Welding and Repair near Rothsay Minnesota. In 1956 Eddie Velo a turkey farmer in the area described to the Kellers a need for a machine small enough to maneuver inside a pole barn and light enough to operate on its upper level. The brothers developed a small three-wheeled design with a belt-driven transmission and delivered it to Velo on February 4 1957.3 Velo allowed the Kellers full access to his operations and after the Kellers learned of drawbacks with the belt-driven transmission they developed and patented a more robust clutch-based transmission system in 1958. The new transmission became the basis of the Melroe M60 loader.
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.
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