features:* Imported VOLVO engine, more power and better performance.* Imported Rexrot main pump and valve group or Hawe main pump and Italy Atos valve group. * Hydraulic system has constant power control function that can make sure drive not damaged by over load.* Equip with high-low pressure switching valve. Switch easily, quick and reliable.* Patent technology of piston return zero function makes easier to daily maintain and replace piston.* Adopt electric-hydraulic exchange technology to realize high efficiency.* Independence forcedly cooling system makes oil temperature lower. * Automatic lubricate system, maintain machine all time.* Main electric components are imported, better reliable.* 6m operate box makes operate easily and safety.* Faults alarming system.