... vehicle chassis, transfer case, main drive system, transmission, double hoist group, mud pump, turntable, derrick, steel wire rope ... mechanical seal sand pump, positive cycle IS150-125-315 water centrifugal pump, 2 bv5121 motor vacuum pump suction vacuum, positive cycle BW850 ... a driving force, equipped with points mechanism and hydraulic system, car to walk, drilling operation installing linkage; ...