In a production process not only about input, process and output. Its include about maintenance of production machines. The maintenance of a production machines is highly recommended, because it will be related with the performance of the machine in production.The same things works for die casting machines in one of biggest industry of manufacturing in Indonesia where the engine or machines is still not operate with normally due downtime happend. Because of it all, using the help of the Overall Equipment Effectiveness (OEE) method for Six Big Loses on this machines we got the big one problem is reduced speed loss which is up to 65%.

Keywords : Overall Equipment Effectiveness (OEE), Six Big Loses, Die Casting Machines.