Used and new Wheeled excavators
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The early years of a wheeled excavator
A wheel excavator is a heavy earth-moving machine which, together with crawler excavators, belong to one of the most important equipment types. It's a two-axled wheeled vehicle equipped with an arm and a digging bucket which can be also replaced with another working organ.
First mobile excavators were mounted on rail, tractor or truck chassis. The first companies which took advantage on demand for them were Bucyrus, Osgood and Marion. In Europe, however, it was Nordest with its Supermobile. This excavator on pneumatic tires had only 45 hp and its maximal speed was 15 km/h (9.3 mph).
After the World War II. there was a construction boom which created needs for new types of machinery. So appeared the modern wheel excavators built as one component. In 1948 the brothers Carlo and Mario Bruneri built a wheeled excavator with a 360 degree slew and fully hydraulic bucket.
Wheeled excavator - one of the main construction equipmentA wheel excavator belongs to single-bucket excavators so its main part is the arm. It's similar to a human arm with two joints in wrist and elbow. The arm moves thanks to two hydraulic cylinders filled with oil. That's the oil pressure that creates the movement and enables the bucket to dig earth.
Although wheel excavators are less stable than machines on tracks (while working it has to be supported by outriggers), they're much lighter and maneuverable. They can easily move on public roads and reach any working site without necessity to be transported, developing a speed to 60 km/h.
To the most important manufacturers of wheel excavators and other construction equipment belong: Atlas, Bobcat, Case, Caterpillar, Fiat, Hitachi, Hyundai, Komatsu, Kobelco, Liebherr, Sennebogen and Volvo.