The hydraulic elements of ZT-1500 Directional Drilling Rig (including hydro pump, motor, Pressure valves, oil ... hoses etc.) The hydraulic elements of ZT-1500 Directional Drilling Rig (including hydro pump, motor, Pressure valves, oil ... transmission. Both of feed force and the Pullback force are 1500 KN. The drill rods are fastened and loosed by the ...