... Rigs, from 250 Tons to 650 tons Model:250T,350T,500T,650T Top DriveTop Drive SystemTDS is one of the greatest ... gear oil75Alarm temperature of hydraulic oil75Transmission ratio12.8:1 Specification (500t) Nominal drilling depth (5 1/2drill pipe)7,000m(23 ... ,000ft)Rated load capacities4,500KN(500t)Drilling torque ( continuous, maximum)54KNqmRotary speed0220rpmRated power of AC ...