New Hydraulic Wrench to remove or assemble a complete string of crawler track grouser in a very short time. The wrench control is actuated by turning the hand grip to operate the directional valve wich is spring centered, so that it will always return to off position when the grip is released. Instantaneous control of wrench: forward, reverse or stop. Accurate control of torque. Manual variable speed. Hydrostatic transmission with axial piston pump.
