Scheduling Preventive Maintenance to Increase the Effectiveness of Injection Molding Machines Using the Overall Equipment Effectiveness Method at PT. Mah Sing Indonesia

Abstract

This study aims to evaluate the Overall Equipment Effectiveness (OEE) in a production environment from January to December 2023. Utilizing quantitative analysis, monthly OEE values were assessed, revealing significant variations. No month achieved the World Class OEE standard of 85%, with the highest value recorded in August (54%) and the lowest in December (35%). The average OEE for the period was approximately 44.67%, substantially below the established benchmark. The primary factor contributing to the low OEE was identified as the low Availability rate, leading to significant machine downtime. Following the implementation of a structured preventive maintenance schedule, machine downtime markedly decreased from 21,540 minutes to 1,464 minutes. Recommendations for moulding machine maintenance include weekly servicing outside production hours, during production halts, or after producing 260,000 units. For other machines, monthly, semi-annual, or annual maintenance schedules are proposed. The study concludes that proper preventive maintenance scheduling can significantly enhance OEE and reduce machine downtime, thereby improving overall production efficiency.