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John Deere Excavators


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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.

On the end of the stick is usually a bucket. A wide large capacity (mud) bucket with a straight cutting edge is used for cleanup and levelling or where the material to be dug is soft and teeth are not required. A general purpose (GP) bucket is generally smaller stronger and has hardened side cutters and teeth used to break through hard ground and rocks. Buckets have numerous shapes and sizes for various applications. There are also many other attachments which are available to be attached to the excavator for boring ripping crushing cutting lifting etc. Excavators in Scandinavia often feature a tiltrotator which allows attachments rotate 360 degrees and tilt +/- 45 degrees in order to increase the flexibility and precision of the excavator.

Excavators are also called diggers JCBs4 (a proprietary name in an example of a generic trademark) mechanical shovels or 360-degree excavators (sometimes abbreviated simply to "360"). Tracked excavators are sometimes called "trackhoes" by analogy to the backhoe.5 In the UK wheeled excavators are sometimes known as "rubber ducks.

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