This study explores servitization as an innovative market strategy for manufacturers and investigates how the decision making logics change over time in the servitization transformation process. Effectuation theory is applied to examine servitization as a new theoretical exploration. A longitudinal case study of a global heavy vehicle manufacturer's servitization process in China reveals that the decision makers adjust their decision making logics depending on the stage of the servitization process and associated risk patterns. As the servitization process evolves into a more sophisticated stage, decision makers will change their decision making logics from a causation dominant logic to an effectuation dominant logic in order to cope with the increased risks. Effectuation theory originally developed from entrepreneurship research is found to be a valid theory for the explanation of the risk and uncertainty control behaviors in the servitization transformation process of manufacturing firms.