Improving the Spare Parts Inventory Management: A Case Study of Sankampaengmotorgroup

Abstract

This research aims to reduce the time required for searching and retrieving spare parts by improving the inventory management system. The study was conducted as a case study at Sankampang Motorgroup, whose business involves construction contracting and the maintenance of electrical and mechanical equipment. As a result, a large volume of spare parts must be stocked to support operational continuity. However, the existing inventory management system lacked efficiency, leading to delays in searching for and issuing spare parts. In this study, industrial engineering and logistics tools were applied to improve warehouse operations. The root causes of the problems were first analyzed using a fishbone diagram, which revealed that process-related and material-related factors had the greatest impact on operational performance. Inventory data on spare parts withdrawals over a one-year period were then collected and analyzed using ABC analysis to classify items according to their level of importance. The results showed that 18 items were classified as Group A, 46 items as Group B, and 106 items as Group C. The ABC classification results were subsequently integrated with warehouse layout design and visual control techniques to optimize the arrangement and storage of materials according to their usage frequency and importance. The results indicated that the average time required to retrieve spare parts before improvement was 21.20 minutes, whereas after implementation it was reduced to 12.15 minutes. This represents a reduction of 9.45 minutes, or 44.06%. The findings demonstrate that the application of ABC analysis in combination with warehouse layout redesign and visual control can significantly reduce search time and enhance the operational efficiency of the spare parts warehouse.