Hydraulic propulsion unit, operation in both directions possible. Welded steal frame with drive wheel with special lining, hydraulically actuated disk brake, hydraulic motor, hydraulic control manifold with servo-valve and pressure transducers, brake wheel with special lining, speed sensing, deflection pulleys for drive cable, hydraulic piping system, highspeed cable pretensioner. Power, torque and max. rpm according to application and technical test specifications. Components are primed and painted according to customer´s requirements.