... main transmit, transmission power, gearbox, sets of windlass, mud pump, sewage pump,mast are set up on the chassis.(3) This rig ... with directional circulation, which is equipped with BW850/2A mud pump, It adopts the slurry as the washing fluid, it can ... four jacks and mast are hydraulic operated. Distribute box, sewage pump, master driving clutch system are air operated.(9) The appearance of rig is ...