... chassis. The transfer case, main driving system, gearbox, slurry pump, and rotary table, drill tower and steel wire ropes, ... direct circulation drilling method. Equipped with BW850/2A slurry pump, it adopts slurry as the drilling fluid, and finally achieves direct ... the four levelling legs are hydraulically controlled. The slurry pump's valves are pneumatically controlled.Applications The rotary table ...