... the workover rig is equipped with sub-frame, PTO, hydraulic torque converter, winch drum and brake system, gear box, duplex ... system, etc. Besides, it is also can equipped with rotary gear box, rotary tabel, drill platform, air slips and swivel and so ... reasonably, tripping fast, and high working efficiency.2. Hydraulic torque converter drives smoothly and softly with stepless speed regulation. And ...