P PT. Mabertech Interindo is a company that engaged in manufacturing of electrical component products. The types of products produced are terminals, screws, and coils. This research only focus on production line which has the highest downtime, which is terminal that has an average of 56% each month. The production process of terminal product are forming process, tumbling, tapping, and platting which is done at subcontract. The forming process on multiforming machines has the highest downtime of all the processes on the terminal production line with an average of 44% per month. The company applies corrective maintenance system, which the maintenance or repair of the machine can be done when the machine had been damaged. Some components often got damaged due to unscheduled maintenance. Due to the problem itself, there are some critical components; bearings, big gear, crank shaft, gear shaft, gear, and ejector. This research aims to proposed improvement for machine maintenance system that experienced the highest downtime, i.e Multiforming machine. The age replacement method is used to maintain the machine according to the age of component life. Age Replacement calculation results in a preventive maintenance schedule for critical components, which after preventive maintenance is applied, downtime of machine will be minimized by 49%. Before preventive maintenance is implemented, downtime total in one year was 1811.1 hours, but after preventive maintenance is implemented, the downtime total will be 930.6 hours.