thomas. Excavator. May 23rd , 2018.
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.
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.
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.
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