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Excavation Work


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thomas. Excavator. May 21st , 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.

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.

Excavators (hydraulic) are heavy construction equipment consisting of a boom dipper (or stick) bucket and cab on a rotating platform known as the "house".1 The house sits atop an undercarriage with tracks or wheels. They are a natural progression from the steam shovels and often mistakenly called power shovels. All movement and functions of a hydraulic excavator are accomplished through the use of hydraulic fluid with hydraulic cylinders and hydraulic motors.2 Due to the linear actuation of hydraulic cylinders their mode of operation is fundamentally different from cable-operated excavators which use winches and steel ropes to accomplish the movements.

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