The three main parts of excavator are engine, hydraulic pump and distribution valve.

Liugong excavator fittings excavates the material mainly is the soil, the coal, the silt and after the preloosened soil and the rock. From the perspective of the development of construction machinery in recent years, excavators have developed relatively fast, and excavators have become one of the most important construction machinery in engineering construction. The three most important parameters of an excavator are operating weight (mass), engine power and bucket capacity.

The first excavator: the appearance of electric motor and internal combustion engine makes the excavator have advanced and appropriate electric device, so all kinds of excavator products are born one after another. In 1899, an electric excavator appeared. After The first World War, diesel engines were also used in excavators. The mechanical excavators driven by diesel engines (or electric motors) were the first excavators.

The second generation excavator: With the extensive use of hydraulic technology, excavators have more scientific and applicable transmission devices, hydraulic transmission instead of mechanical transmission is a great leap in excavator technology. In 1950 a hydraulic excavator was born in Germany. Mechanical drive hydraulic excavator is the second generation.

The third generation excavator: the extensive application of electronic technology, especially computer technology, makes the excavator have automatic control system, and also makes the excavator develop to the direction of high performance, automation and intelligence. The germination of electromechanical integration occurred around 1965, and the use of electromechanical integration technology in mass production of hydraulic excavators in 1985 or so, when the main purpose is to save energy. Electronic excavator is the symbol of the third generation excavator.

Use model：922D