Key Metrics for Demonstrating Predictive Maintenance Success

Choosing the right metrics is critical to the success of a predictive maintenance program. What gets measured gets improved; what isn’t tracked rarely sees change. By capturing and reporting on the most relevant data points, you focus on the behaviors that matter and illuminate hidden issues for everyone involved. Most importantly, data is the currency that convinces upper‑management of real progress: "In God we trust. Everybody else brings data."

Before you select metrics, keep these guiding principles in mind:

Measure what you don’t yet understand. When a process is unfamiliar, every action feels random. Detailed measurement turns uncertainty into insight.

Simplicity wins. Metrics should be straightforward, actionable, and directly tied to business outcomes.

Link actions to goals. Pick indicators that translate your long‑term reliability strategy into concrete targets and short‑term initiatives. Ask, "What must we excel at to reach our goals?"

Secure stakeholder buy‑in. Present draft metrics to operations, finance, safety, quality, and maintenance leaders. Invite feedback: "Here’s what I’m considering—what do you think?"

Establish a shared language. Consistent metrics foster common understanding across diverse teams.

Guard against overload. Excessive data gathering can dilute focus. Prioritize the most impactful indicators to avoid spending more time measuring than improving.

Roll metrics in phases. Instead of launching 12 metrics at once, test two or three, validate their relevance, and iterate. Quick wins build momentum and prove value early.

Armed with these principles, the single most powerful metric to monitor is the proportion of total maintenance man‑hours driven by predictive maintenance. Best‑practice reliability programs typically generate about 50% of their work from predictive inspections and corrective actions—a clear benchmark for cost‑effective maintenance.

This figure illustrates the cycle to improved equipment reliability. (Click here to enlarge)

TOP 10 LIST

Below is a ranked list of essential metrics. Adapt the selection to the maturity level of your program.

1. Predictive Maintenance Effectiveness: Ratio of corrective work hours identified by PdM to hours spent on PdM inspections. Aim for 1.5–2.5 hours of corrective work per hour of PdM effort.

2. Implementation Speed & Adoption: Mean time to act on PdM recommendations and the percentage of recommendations implemented over a 12‑month rolling average. Target <45 days and >80% adoption.

3. Work‑Flow Contribution: % of total maintenance tasks generated by PdM. 50% or higher indicates strong program influence.

4. Backlog Alignment: Planned work in the scheduler’s backlog that originates from PdM. Maintain a 4–6 week backlog with 50% PdM content.

5. Schedule Adherence: PdM execution versus plan. Consistent 90%+ adherence reflects disciplined execution.

6. Analyst Productivity: Number of machines or inspection points handled per analyst per month. Benchmarks vary by context and access.

7. Asset Health: % of assets free from defects. Strive for >80% defect‑free status through robust monitoring.

8. Maintenance Cost Ratio: Maintenance spend as a % of asset value. Keep below 2.5% for efficient asset stewardship.

9. Labor Allocation: % of maintenance labor dedicated to PdM inspections. Typical targets range from 10–15%.

10. Overall Equipment Effectiveness (OEE) & Utilization: Industry leaders often exceed 92% OEE; tailor targets to your operational context.

WHAT NOT TO MEASURE

While cost avoidance is a tempting metric, it rarely appears on financial statements and offers limited managerial insight. Instead, focus on outcomes that directly influence the bottom line:

• Reduced labor costs
• Lower spare‑parts inventory
• Increased throughput capacity
• Reduced energy consumption
• Enhanced safety performance
• Improved product quality

These results provide tangible proof of value and align closely with financial performance goals.

John Schultz is a partner at Allied Reliability and a Certified Maintenance & Reliability Professional through SMRP. As the largest consulting, engineering, and service firm focused on predictive and preventive maintenance, Allied Reliability supports more than 200 plants across the U.S., Canada, Europe, and Latin America. For deeper insights, download a free copy of "PdM Secrets Revealed! How to Improve Your PdM Program or Start One from Scratch" at www.alliedreliability.com or contact John at 812‑841‑9252 or schultzj@alliedreliability.com.