... top drives of different brands such as Varco, Canrig, Tesco, MH, Soilmec, BPM, etc. Experience Overhaul and medium ... -speed double-reduction gear system that provides a 10.5:1 ratio from the motors to the ... the lower section of the mast/derrick, approximately 10-15 feet above the drill floor.The guide ... is a completely self-contained, onboard system. A 10 hp, 1800rpm, AC motor, drives two hydraulic pumps ...