Work independently of each other to produce the three sports. Implementation and rotating mechanism of power match. The third pump is turned on other sports work, became the second independent open circuit fast motion. In addition, the widespread use of hydraulic excavator technology, electronic technology, automatic control technology application and promotion of the excavator to create the conditions. Overall, lower domestic excavator holdings, but the high price, sales model to a finance lease or mortgage-based, large-scale recycling of used digging machine manufacturers, once the credit easing excavator sales will be rebound the best products. Can predict large-scale recycling of used digging machine information, 2011-2013, large-scale recycling of used digging machine market, pick up with the recovery of the world economy of China, Beijing large-scale recycling of used digging machine, real estate, and speed up urbanization construction proceeds, the tonnage mining machine sales will continue to grow, net of uncertainties 2011 - 2013 tonnage excavator will increase over 15% growth rate.