... workover rig is equipped with sub-frame, PTO, hydraulic torque converter, winch drum and brake system, gear ... Besides, it is also can equipped with rotary gear box, rotary tabel, drill platform, air slips and swivel ... tripping fast, and high working efficiency.2. Hydraulic torque converter drives smoothly and softly with stepless speed ... height (m)18 XJ45 (300KN/ 2000m) hydraulic rotary drilling rig