and swivel and including an hydraulically powered top drive pipe rotating device having a single hollow shaft with threads at each end for mating on one end with the drill string or tubular to be worked and on the other with a drilling swivel the top drive rotating device is attached to a wheeled support frame which moves on guide rails which are mounted to a derrick the top drive apparatus can be pivoted in a horizontal plane away from the vertical axis of the drill string or other tubulars motive force is applied directly to the drill string or other tubular being worked a pivotable pipe lifting and positioning device is mounted beneath the top drive on the wheeled support frame for picking up pipe and positioning it so that the pipe threads can mate precisely with the threads of the top drive shaft a makeup breakout wrenching device is pivotably connected to the wheeled support frame beneath the top drive application_number US 1698087 A description referring now to fig1 an hydraulically powered drilling top drive apparatus 10 according to the present invention is suspended from a commercially available swivel 11 fitted with optional bail links 12 for counterbalancing this swivel in turn is attached to a traveling block 13 which is attached by cables to a crown block 14 in the derrick 15 the top drive 10 is attached to a wheeled support frame 16 which is mounted.