Today Top Drive System has been the most widely used power device in oil/gas drilling rig. by followed, the repair and replace of spare parts for TDS become a important practice In the area of oil drilling, from the beginning, Varco top drive systems (TDS) offer unmatched performance and reliability while continuing to drive longer, heavier strings through complex formations, over 2500 Varco TDS is servicing for the oil-field around the world.