Producers of liquid concrete are predicted to continue to grow. PT. RAJA Beton Indonesia engaged in readymix business in 2017 - 2019 experienced several times the damage to the production machine during the production process that caused a cost that is not cheap. Appropriate methods are needed to minimize maintenance costs. So the purpose of this research is to find out the preventive maintenance of Batching Plant with modularity design approach in PT. RAJA Beton Indonesia effectively and efficiently to produce a minimum total maintenance cost. Preventive maintenance with modularity design method is done by collecting data with documentation, interviews, and observations. The analysis technique starts from determining the company's initial total cost, and is continued by determining the total cost of this method which in some processes involves minitab 18 software. The results showed that the cost of maintenance using preventive maintenance with modularity design method resulted in a cheaper cost compared to the cost incurred by the company with corrective maintenance.

Keywords : Preventive Maintenance; Correcrive Maintenance; Minitab 18; Modularity Design