... drilling rig WDH-500 is centrally driven by a Cummins diesel engine, with all the mechanism/systems of traveling, rotating, driving ... , feeding, rod loosing, lifting units and hydraulic legs, winches, mud pumps all hydraulically controlled/driven. This allows the drilling ... thermal water well and engineering foundation holes drilling.Model: WDH-500Max. Drilling Depth : 300MHole Size: 140 - ...