... is enhanced;7,Safe wire -controlled walking system;8,The floatable of the main axle can ... stress;9,Comparing to the traditional hydraulic system, the advanced hydraulic system improve15-20% of the work efficiency, ... lost and saves 15-20% energy;10,Cooling system is equipped on the power head, which can ... (YQ3000-L) rig, which is the best drilling rig compared with the similar capacity rigs in China ...