Incorporating German "Mannnesmann" hydraulics. Two-level tension (high and low), closed hydraulic circuit for bullwheels, infinitely variable speed control. "Combination usage" doubles pulling force, where the output power is 2.5 times larger than single puller's. Tension or pull force can be preset; Spring applied brake, reliable overload protection mechanism, easy to operate. The unit can also act as tensioner for tension stringing pulling ropes, or used in reconductoring application. Note: "Combination usage" must be ordered separately and need training.