... DTH drilling, high speed High Speed Track Mounted All hydraulic Water Well Drilling RigModel No. WDH-500.WDH-500 hydraulic ... driven by a Cummins diesel engine, with all the mechanism/systems of traveling, rotating, driving, feeding, rod loosing, lifting units ... This makes WDH-500 a most ideal equipment for water well, thermal water well and engineering foundation holes drilling.Model: WDH-500Max ...