... varco tds-11sa top drive for rental or lease New Varco Top Drive 500 tons rated at 7500psi Electric Model TDS-11SA with ... ) a 10.5:1 double reduction helical, quiet gear drive, hydraulic disk brakes, powered rotating head, counter balance and ... of the motor. The drilling motors, manufactured specifically for top drive applications, have internal temperature sensors, vacuum varnish impregnated windings, ...