Analisis Penambahan Water Separator 25 Mikron pada Unit Komatsu HD 465-7 dengan Metode Root Cause Analysis (RCA) di PT GHJ Triagung Mandiri Site GAM

Heza Figo Anandya, Dr. Ir. Sugiyanto, S.T., M.Eng., IPM.

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

Industri pertambangan sangat bergantung pada ketersediaan dan keandalan alat berat untuk menunjang produktivitas. Pada unit Komatsu HD 465-7R di PT GHJ Triagung Mandiri Site Ganda Alam Makmur ditemukan masalah low power engine akibat kontaminasi air dan partikel pada bahan bakar biodiesel B35, yang berdampak pada meningkatnya breakdown time, menurunnya availability, serta tingginya biaya operasional. Penelitian ini bertujuan menganalisis efektivitas pemasangan water separator 25 mikron (Racor 25µ) terhadap peningkatan keandalan dan efisiensi biaya. Penelitian dilakukan Februari–Mei 2025 pada empat unit HD 465-7R dengan metode kuantitatif komparatif melalui Root Cause Analysis (RCA) serta perbandingan data sebelum (Januari–Maret 2025) dan sesudah pemasangan (April–Juni 2025). Parameter yang dianalisis meliputi breakdown time, Physical Availability (PA), Mechanical Availability (MA), MTTR, MTBF, dan saving cost. Hasil menunjukkan rata-rata breakdown time unit HDKM46006 menurun dari 222,04 jam/bulan menjadi 167,56 jam/bulan (turun 24,5%). Secara keseluruhan, breakdown time empat unit turun dari 184–228 jam menjadi 105–173 jam (penurunan 25–30%). Nilai PA meningkat dari 88–89% menjadi 90–92%, disertai penurunan MTTR dan peningkatan MTBF. Total potensi saving cost mencapai Rp 734.400.000 selama April–Juni 2025, dengan rata-rata Rp 183.600.000 per unit. Biaya investasi ±Rp 28.000.000 dapat kembali dalam waktu kurang dari satu bulan. Disimpulkan bahwa pemasangan Racor 25µ efektif meningkatkan keandalan, menurunkan breakdown 25–30%, dan memberikan efisiensi biaya signifikan, sehingga layak diterapkan sebagai strategi preventive maintenance berbasis data.

The mining industry heavily depends on the availability and reliability of heavy equipment to support operational productivity. In the Komatsu HD 465-7R units at PT GHJ Triagung Mandiri, Ganda Alam Makmur Site, a low power engine issue was identified due to water and particle contamination in B35 biodiesel fuel. This condition led to increased breakdown time, decreased availability, and higher operational costs. This study aims to analyze the effectiveness of installing a 25-micron water separator (Racor 25µ) in improving reliability and cost efficiency. The research was conducted from February to May 2025 on four HD 465-7R units using a comparative quantitative method through Root Cause Analysis (RCA) and comparison of data before installation (January–March 2025) and after installation (April–June 2025). The analyzed parameters include breakdown time, Physical Availability (PA), Mechanical Availability (MA), Mean Time To Repair (MTTR), Mean Time Between Failure (MTBF), and cost savings. The results show that the average breakdown time of unit HDKM46006 decreased from 222.04 hours/month to 167.56 hours/month (a 24.5% reduction). Overall, the breakdown time of the four units decreased from 184–228 hours to 105–173 hours (a reduction of 25–30%). The Physical Availability (PA) increased from 88–89% to 90–92%, accompanied by a decrease in MTTR and an increase in MTBF. The total potential cost savings reached IDR 734,400,000 during April–June 2025, with an average of IDR 183,600,000 per unit. The investment cost of approximately IDR 28,000,000 was recovered in less than one month. It can be concluded that the installation of the Racor 25µ effectively improves reliability, reduces breakdowns by 25–30%, and provides significant cost efficiency, making it feasible to be implemented as a data-driven preventive maintenance strategy.

Kata Kunci : Komatsu HD 465-7, Racor 25µ, Root Cause Analysis, Biodiesel B-35, PA, MA, MTTR, MTBF, saving cost