ANALISIS KERUSAKAN UNIT EXCAVATOR KOBELKO SK210LC DENGAN PENDEKATAN FAULT TREE ANALYSIS PADA CV. CAHAYA INDRA LAKSANA

Excavators greatly assist human work with a work system that wants to be completed quickly and has a greater production capacity compared to conventional power. Heavy equipment if used continuously will shorten its life. Therefore, maintenance is important on Excavators. This study uses the Fault Tree Analysis (FTA) method as a tool that can determine basic damage to the object being studied which is continued by calculating MTBF (Mean Time Between Failure), MTTR (Mean Time To Repair), and Availability. This method is used to determine how long the tool can operate before damage occurs, as well as the time needed to repair damage to the tool, then the effectiveness of the tool's performance within a certain period of time. The results of the analysis with FTA explain the basic damage to the Gear Swing due to operator error, dirty oil being inserted, late oil changes, poor oil quality, insufficient grease lubrication and/or contaminated grease. Damage to the injector is broken due to the quality of the cheap diesel filter, late replacement of the diesel filter, poor diesel, the tank is condensing and has not been drained for a long time. Damage to the hydraulic hose is broken because it is time to replace it, the relief valve is jammed, rubber flakes are broken inside, the hose specifications are not right and/or the engine overheats. The MTBF calculation results of this tool are 91.25 hours, MTTR is 8.84 hours, Availability is 90.3%..