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Mining operations heavily depend on the reliability of heavy equipment to maintain productivity. One of the main causes of production disruptions is Breakdown Unschedule (BUS), which refers to equipment failures occurring outside scheduled maintenance periods. Data from PT Karunia Armada Indonesia indicate that the CMT106 Dump Truck experienced the highest BUS frequency. Pareto analysis identified the cabin system as the primary contributor to BUS, with the cabin mounting being the dominant cause due to loose, broken, and missing mounting bolts. This study aims to improve the reliability of the cabin mounting using the Quality Control Circle (QCC) method. Improvements were implemented through the use of Grade 10.9 bolts, the addition of spring washers, the application of thread locker, and periodic tightening and inspections. The results showed that failures decreased from 97 to 4 incidents (95.9%), downtime was reduced from 96 hours to 2.55 hours, and operational cost savings reached IDR 220,482,000 per year.
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Mercy et al. (2026) studied this question.
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