Here is why it happens, and why it is not a discipline problem you can fix by leaning on the crew. PdM compliance trails calendar PM compliance for two structural reasons: PdM work shows up on a less predictable schedule, and it needs resources that are harder to free up on short notice. Lump it in with your calendar PMs and the easy work carries the average, hiding a gap that sits on exactly the assets you most wanted to protect.
PdM work does not arrive on a tidy calendar
A calendar PM is predictable. It comes due every 30 days, or every quarter, and you can see it coming and plan the labor around it. Condition-based and predictive work is different. It generates off meter readings and condition measurements, so a work order appears when a meter crosses a threshold or a measurement point trips a limit, not on a date you picked in advance.
That unpredictability is the whole point of PdM. You are reacting to the actual condition of the asset instead of the calendar. But it plays havoc with scheduling. A vibration reading comes back bad on Tuesday and now you have a work order that needs a specialist this week, competing with everything already on the schedule. Multiply that across a fleet and your predictive work is constantly arriving at awkward times.
And it needs resources you cannot conjure on demand
The work that arrives unpredictably is also the work that needs specialized people, tools, and sometimes an outside vendor. A general mechanic cannot always pick up a vibration analysis follow-up. The thermography camera is with another crew. The replacement bearing is not in stock because nobody expected to need it this week. So the PdM work order sits, waiting for the labor, the tool, or the part to free up, while your calendar PMs, which any tech can do with stock parts, sail through on time. That is the gap, and it is structural, not attitudinal.
The gap hides on your most critical assets
Here is what makes the trailing number dangerous rather than just untidy. You do not put condition monitoring on the parking lot lights. You put it on the assets you decided were critical enough to watch continuously. So when PdM compliance trails, the shortfall is concentrated exactly where a missed catch costs the most.
What to actually do about it
First, track PdM compliance as its own number, separate from calendar PM. You cannot manage a gap you cannot see, and the combined number is built to hide this one.
Second, get ahead of the scheduling problem with tools Maximo already gives you. Calendars define who is available and on what shifts, and Assignment Manager lets you see that availability against the work waiting to be assigned. When an unpredictable PdM work order lands, that visibility is the difference between fitting it into a real opening this week and letting it drift until next month.
Third, and this is the one most people miss, find out whether your PdM work is waiting on labor or on parts, and prove it with data. Build KPIs in KPI Manager for labor and craft availability and for stockouts, turn on their history, and watch them next to your PdM work order generation and completion. If your PdM compliance dips line up with stretches of low craft availability or with stockouts, you have your answer in black and white. The predictive work is not slipping because the crew is lazy. It is slipping because the specialized labor or the part was not free when the unpredictable work arrived.
The PM Compliance Calculator will give you the separate PdM number to start watching, and the PM Compliance Self-Assessment will help you confirm the calendar side of your program is as solid as it looks.
This article covers why PdM compliance structurally trails calendar PM compliance. The Maximo KPI Guide to PM Compliance walks through the full implementation from compliance window definition through segmentation by PM vs. PdM, craft, site, and asset criticality, including KPI Manager setup for trending PdM completion against labor availability and stockout history.
Frequently Asked Questions
Why is my PdM compliance lower than my PM compliance?
PdM work arrives unpredictably, driven by meter readings and condition thresholds rather than a calendar. It also needs specialized labor, tools, and sometimes outside vendors that are harder to schedule on short notice. Calendar PMs, which are predictable and use general crafts, sail through on time while predictive work waits for resources.
Why does predictive maintenance work slip more than calendar PMs?
Calendar PMs are predictable. You can see them coming weeks ahead and plan labor around them. PdM work orders appear when a condition threshold trips, competing with everything already on the schedule. The unpredictable arrival combined with specialized resource requirements creates a structural scheduling disadvantage.
Should I track PdM compliance separately from PM compliance?
Yes. A combined number lets calendar PM compliance carry the average and hides the PdM gap. Since you put condition monitoring on your most critical assets, a PdM shortfall is concentrated where a missed catch costs the most. You cannot manage a gap you cannot see.
How do I find out if my PdM work is waiting on labor or parts?
Build KPIs in KPI Manager for labor and craft availability and for stockouts, turn on their history, and lay them next to your PdM compliance trend. If the dips line up with low availability or stockout spikes, you have your cause and your evidence. That is a resourcing conversation, not a discipline conversation.
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