What is the definition of a PM Maintenance? PM Maintenance stands for Preventive Maintenance. It is an approach to equipment maintenance that focuses on preventative measures that are designed to keep equipment in good working order and reduce the need for repairs. This type of maintenance is proactive and helps to reduce the overall cost of ownership as it avoids expensive repairs and replacements. It often includes regular inspections, testing, and maintenance activities that are scheduled on a regular basis, typically every month or quarter. PM Maintenance activities can include anything from lubricating and checking fluid levels to inspecting and replacing parts. The goal of PM Maintenance is to identify and address potential problems before they become serious and result in costly repairs or replacements. PM Maintenance can help ensure that equipment is operating efficiently and reliably, reducing the chance of unexpected downtime and increasing the lifespan of the equipment.