If you’re still using that old white board or those excel spreadsheets, it is next to impossible to get an accurate indicator of preventive maintenance compliance. Saying that, without a CMMS it is next to impossible to adequately track any maintenance metrics or costs. The easiest way to calculate your preventive maintenance compliance is using your Maintenance Assistant CMMS. It is quite common for organizations to use the preventive maintenance compliance metrics to measure maintenance performance although PM compliance gets a mixed reception from operations managers. PM compliance could be 100% yet system downtime could still be a major issue. This is because the formula only measures whether the PM was complete or not, regardless if it was weeks late. Therefore, you should work to the 10% rule of preventive maintenance. The 10% rule states that a preventive maintenance action should be completed within 10% of the scheduled maintenance interval. For example, a quarterly PM every 90 days, should be completed within 9 days of the due date or it is out of compliance. The 10% rule helps keep your PM intervals constant, reducing the time variable variation, thus improving reliability.
If done correctly, measuring preventive maintenance compliance and charting that against unscheduled breakdowns and costs is an excellent way to determine if your PM program is working for you or if it needs to be adjusted with either more frequent PMs or longer PMs to balance uptime, productivity, maintenance costs, reliability and asset life