J. Stanton McGroarty, CMfgE, CMRP, is senior technical editor of Plant Services. He was formerly consulting manager for Strategic Asset Management International (SAMI), where he focused on project management and training for manufacturing, maintenance and reliability engineering. He has more than 30 years of manufacturing and maintenance experience in the automotive, defense, consumer products and process manufacturing industries. He holds a bachelor of science degree in mechanical engineering from the Detroit Institute of Technology and a master’s degree in management from Central Michigan University. He can be reached at
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Tracking the percentage of PM work orders completed is recommended, as the two measures tend to track closely. There may be a tendency at first to reduce the scope of work orders to provide earlier closure and a higher score. This is to be avoided, since it tends to leave work undone.
Significance: The ability to plan, estimate, schedule, and complete PM work predictably is the foundation of all preventive maintenance. If this basic sequence of operations cannot be established or is constantly interrupted, all asset health care performance is in jeopardy. There is often a tendency to postpone PM work first when schedule breakers occur. This is a mistake. It may reduce the pain of schedule changes somewhat, but it begins a trip down the slippery slope to unplanned maintenance.
As with corrective maintenance, on-time PM completion rates of less than 80% indicate that a maintenance area is out of control. Sadly, measurement and improvement often start with effective rates of 0%, since definitions of completion are often not in place to support scorekeeping.
The journey from 80% to 90% on our PM-completion KPI indicates predictability has been achieved. OEE control can also be achieved as predictability of maintenance completion approaches 90%.
Getting started: The PM-completion-rate KPI demonstrates the degree of commitment to PM. PM planning must be established and woven into the routine of all PM work. Planning must include accurate estimation of resources involved in executing work orders. This requires a closed-loop system for improving inaccurate estimates. Scheduling that is driven by accurate estimates and balanced against actual staff availability must follow. Weekly planning and scheduling meetings will be required to develop and publicize accurate schedules. Finally, each work order must be closed with the return of equipment to production, the documentation of lessons learned, and the return of maintenance resources for the next job.
Assessment of today’s situation: Using today’s KPI, we would say that effective PM requires that PM planning and execution run as a predictable routine 90% of the time. If the maintenance organization gives in to the temptation to routinely perform unplanned maintenance at the expense of PM work, the system will become more and more reactive as missed PM work causes unplanned failures in the production system. Once this change occurs, reactive maintenance destroys OEE, creating a huge competitive disadvantage.