Why-why analysis is known as a quality control tool to inquire the root cause of a problem. In this study "5-why" analysis is referring to Toyota Production System (TPS) and being used to improve the predictive maintenance strategy in a molding company. The "5-why" analysis is effectively used in factories adopted TPS, for a machine dependent company every minute of unplanned machine stops during production run is a cost and time lost. This study was focus on application and methodology for predictive maintenance base on the "Mean time to failure statistic" to reduce the number of production loses due to machine break-down. The "5-why" analysis method is used in order to know the machine condition and main issues. With the purpose to apply the "5-why" in predictive maintenance strategy at injection molding machine this study was performed as a case study.
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