Varco TDS-4S pocket guide - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Varco TDS-4S essentials. Through the years, the Varco engineering team improved on the top drive design and the TDS series was paving the road of innovation, modularity, and reliability TDS-4S Top Drive System Service Manual SM00620 Revision B March 8, Varco produces several Top Drive Drilling Systems (TDS) to rotate the drill string 01D811000457-GEN-001/01. Top Drive System Service Manual. TDS-4S. SM00620 Revision B 1-53 Varco Drillers control and instrumentation Console (VDC) . TDS-4S. The Varco TDS-4S is the number one selling top drive in The TDS-4S system components include a remote and manual blowout preventer.Refurbished NOV (Varco) TDS-4S Topdrive Motor Housing Assembly complete with GE752 DC Hi Tq Shunt Motor. Configured for Remote Cooling with 120V Ex Solenoids