... because a rigid lower deviated beam balance . The beam pumping unit endows some features of reliable performance,simple structure,easy operation ... for the people's Republic of SY/T5044 beam pumping unit, and the American Petroleum Institute API 11E standard ,the ... suspension center loadReducer TorqueStroke Stroke FrequencyMotor Power Machine QualityCYJ3-0.75-2.8HY25-64-30302.80.759,143.24.5CYJ3-1 ...