Abstract
The Mining Industry is one of the pillars of national economic development. In this industry, heavy equipment plays an important role in the coal mining process in Indonesia. By using heavy equipment must be well structured, so that the project can run easily without any obstacles. This research aimed to evaluate the cause of the low-value OEE of the Excavator Hitachi EX2500-6 of EX157 and EX158 units and determine the way to repair so that the equipment performance can be improved. This research uses descriptive quantitative approach with value analysis methods Overall Equipment Effectiveness (OEE). The result of OEE values were analyzed using losses classification method so that the occurrence of loss factors can be found and root cause analysis performance using a causal diagram/fishbone diagram and then make any improvement recommendations that can be done by using 5W1H analysis. Based on the research results, the OEE values of two excavators were calculated and were compared with the benchmark values. The values of OEE were found to be 84% for EX157 units and 68% for EX158 units. The low value of OEE on EX158 caused by unscheduled maintenance time losses amounting to 1188.3 hours. The high of time loss is influenced by trouble on Machine Frame, Structure, Body, and Cab components amounted to 60.9%. The root causes of the losses derived from the availability of external mechanics, the competence of mechanics, the availability of spare parts, and the implementation of condition monitoring was not optimal. While remedial steps can be taken by giving technical training program for mechanics as maintenance practice methodology.
Highlights
In the world of coal mining, heavy equipment may not be familiar to be heard and seen.These tools are used to support the mining process from opening a mine, making roads, excavating, pushing and transporting mining materials to the process.PT Petrosea, Tbk has several mining equipment / heavy equipment operating in the Tabang location such as excavators, trucks, graders, dozers, and cranes
To achieve the overall equipment effectiveness (OEE), the first step that is the focus of major losses to eliminate, the analysis of the Causal (Ishikawa diagram), and the making of the recommendation or proposed improvement measures made after the known results of the calculation of the Overall Equipment Effectiveness, six big losses and the result of the root of the problem using cause and effect analysis
The OEE value of EX157 was found to be above to the benchmark value i.e. 77 % (Elevli, 2010), and the value of OEE for EX158 was found to be far less than the benchmark value
Summary
In the world of coal mining, heavy equipment may not be familiar to be heard and seen.These tools are used to support the mining process from opening a mine, making roads, excavating, pushing and transporting mining materials to the process.PT Petrosea, Tbk has several mining equipment / heavy equipment operating in the Tabang location such as excavators, trucks, graders, dozers, and cranes. In the world of coal mining, heavy equipment may not be familiar to be heard and seen. These tools are used to support the mining process from opening a mine, making roads, excavating, pushing and transporting mining materials to the process. PT Petrosea, Tbk has several mining equipment / heavy equipment operating in the Tabang location such as excavators, trucks, graders, dozers, and cranes. This heavy equipment is used to assist the process of mining operations from the loading area to the disposal area. PT Petrosea, Tbk currently has 3 types of excavator models operating that is in Tabang, Komatsu PC2000-8 are 3 units, Hitachi EX2500-6 are 2 units, and Libherr R9250 are 4 units
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