Analisis Pengendalian Spare Part Service Menggunakan Metode EOQ Pada Unit Double Trailer diPerusahaaan Hauling Batu Bara

Novy Pratama Andriani, Dr. Ilham Ayu Putri Pratiwi, S. T.

2026 | Tugas Akhir | D4 TEKNIK PENGELOLAAN DAN PERAWATAN ALAT BERAT

Perusahaan hauling batu bara sangat bergantung pada kinerja unit double trailer yang mendominasi 53?ri total populasi alat. Tingginya intensitas operasional menyebabkan kebutuhan spare part service bersifat rutin dan fluktuatif. Pengelolaan persediaan yang belum optimal menimbulkan kondisi overstock maupun stockout yang berdampak pada peningkatan biaya dan terganggunya kegiatan perawatan, sehingga diperlukan metode pengendalian persediaan yang lebih terstruktur. Penelitian ini menganalisis penerapan metode Economic Order Quantity (EOQ) pada spare part service unit double trailer berdasarkan data pemakaian tiga komponen, yaitu fuel filter, water separator, dan oil engine selama periode November 2024 hingga Oktober 2025, mencakup biaya pemesanan, biaya penyimpanan, dan lead time. Hasil perhitungan EOQ kemudian dibandingkan dengan metode pengelolaan yang diterapkan perusahaan untuk menilai efisiensinya. Metode EOQ terbukti menghasilkan kebijakan pemesanan yang lebih optimal dan menurunkan total biaya persediaan dibandingkan metode perusahaan. Penghematan terbesar terjadi pada fuel filter sebesar 64,78%, diikuti water separator 62,84%, dan oil engine 33,54%, dengan total penghematan keseluruhan sebesar 38%. Temuan ini menunjukkan bahwa metode EOQ efektif meningkatkan efisiensi pengelolaan persediaan dan mendukung kelancaran operasional perusahaan. 

Coal hauling companies are highly dependent on the performance of double trailer units, which dominate 53% of the total equipment population. The high operational intensity results in a routine and fluctuating demand for service spare parts. Suboptimal inventory management leads to overstock and stockout conditions that increase costs and disrupt maintenance activities, highlighting the need for a more structured inventory control method. This study analyzes the application of the Economic Order Quantity (EOQ) method for service spare parts of double trailer units based on usage data of three components, namely fuel filter, water separator, and oil engine during the period of November 2024 to October 2025, covering ordering costs, holding costs, and lead time. The EOQ calculation results were then compared with the company's existing inventory management method to evaluate its efficiency. The EOQ method proved to generate more optimal ordering policies and reduce total inventory costs compared to the company's method. The greatest cost savings were achieved for fuel filter at 64.78%, followed by water separator at 62.84%, and oil engine at 33.54%, with an overall total savings of 38%. These findings indicate that the EOQ method is effective in improving inventory management efficiency and supporting the company's operational continuity. 

Kata Kunci : inventory control, spare parts, Economic Order Quantity (EOQ), double trailer, coal hauling.