... , the main transmit, transmission power, gearbox, sets of windlass, mud pump, sewage pump,mast are setup on the chassis.This rig is a ... with directional circulation, which is equipped with BW850/20 mud pump, It adopts the slurry as the washing fluid, it can ... , the four jacks and mast are hydraulic operated. Distribute box, sewage pump, master driving clutch system are air operated.The appearance of ...