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Abstract The major concern of industrial companies is to gain maximum profit using minimum cost, and one of the most important ways to achieve minimum cost is to maintain the high efficiency of machines and reduce the number of failures and the downtime. The objective of maintenance is to maintain existing equipment by inspection, cleaning, lubrication, painting, plant protection, security pollution, and noise control. There are many types of maintenance; reactive or corrective maintenance and preventive maintenance. Reactive maintenance means the repair work required after equipment failure has occurred. Preventive maintenance (PM) is the maintenance of equipment or systems before fault occurs. Reactive maintenance (unplanned maintenance) has many overhead costs that can be avoided during the planning process. The cost of unplanned maintenance includes lost production, higher costs for parts and shipping, as well as time lost responding to emergencies and diagnosing faults while equipment is not working. When maintenance is planned, each of these costs can be reduced. Equipment can be shutdown to coincide with production downtime. Prior to the shutdown, any required parts, supplies, and personnel can be gathered to minimize the time taken for a repair. These measures decrease the total cost of maintenance. |