Hydraulic torque converters have developed from a single model to two large series of 13 models, including D65, D85, D155, D355, D6D, D7G, D8L and so on, basically covering all models of hydraulic torque converters used for the bulldozers in China. Our products are supplied as components for major bulldozer manufacturers. D65 hydraulic torque converter and D85 hydraulic torque converter have been chosen by the General Arms Department as the products for the bulldozers used by the engineering soldiers. Some products have been exported with the main unit to Sudan, Yugoslavia, Pakistan and Iran in large quantity. Some components have been exported Italy and the South-east Asian countries.