<![CDATA[This study aims to analyze the maintenance system of production machines at PT. ABC, a company engaged in die casting molds, plastic injection molds, precision parts, and jig fixtures. Based on failure frequency data from 2023–2025, Lathe Machine 1 was identified as the machine with the highest breakdown rate, with the dynamo component being the most critical part. To determine the optimal maintenance strategy, a reliability analysis was conducted using a lognormal distribution. The results showed that the Mean Time To Failure (MTTF) of the dynamo reached 287.87 hours, while the Mean Time To Repair (MTTR) was recorded at 3.34 hours. Based on these calculations, the optimal replacement interval was determined to be 154 hours, or approximately ±21 days, with an availability level of 0.9929 and a reliability level of 0.7617. From an economic perspective, the preventive maintenance method proved to be more cost-effective compared to corrective maintenance, offering potential cost savings of up to 61.86%. These findings highlight that the implementation of preventive maintenance not only reduces maintenance costs but is also effective in minimizing machine downtime, improving operational reliability, and ensuring smooth production processes. Therefore, preventive maintenance is strongly recommended as a key strategy to enhance operational efficiency and production sustainability at PT. ABC, while also serving as a valuable reference for future decision-making in the maintenance of critical machine components. Keywords: Age Replacement, Maintenance Cost, MTTF, MTTR]]>
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