How to Stop Missed Preventive Maintenance: 7 Steps That Work
Missed PMs usually come down to the schedule, not the techs. Over the years the PM list keeps growing until it needs more hours than the crew has left after breakdowns, and the same jobs get pushed month after month. Every pushed PM raises the odds of a breakdown on that machine. This guide walks through seven steps to get PMs done on time, why they get missed, and what to check every week.
Quick Answer: Why PMs Get Missed and What to Do
| Reason PMs slip | What it looks like | Fix |
|---|---|---|
| Too many PMs | Same PMs pushed every month | Clean up the list; keep safety checks and required inspections |
| Not enough hours | PMs lose to breakdowns | Size schedule to real crew hours; spread the load |
| No owner | Nobody knows who should do it | Assign a person or crew to every PM |
| Wrong trigger | PM due when equipment is idle (or overdue when it’s busy) | Use meter or run-hour triggers |
| Vague task | Takes too long; done differently each time | Attach a step-by-step checklist |
| Parts or access | PM opened but can’t be finished | Record the reason; stock parts; plan with production |
| No follow-up | Overdue list keeps growing | Weekly 15-minute overdue review |
What Do Missed PMs Really Cost?
Missed PMs add up. The U.S. Department of Energy estimates a working preventive maintenance program saves 12% to 18% on average compared with reactive maintenance (U.S. DOE, 2010; see our maintenance statistics page). And NIST found U.S. manufacturers that relied most on reactive maintenance had 3.3 times more downtime than those that relied on it least (NIST, 2020; see our maintenance statistics page).
Here’s the order we’d tackle it in.
1. Why should you clean up the PM list first?
A shorter list of PMs that matter gets done, while a long list full of outdated tasks teaches techs that skipping is normal.
Most PM lists grow for years and never shrink. Go through yours and remove PMs for retired assets, merge duplicates, and ask about any task nobody can explain. Safety checks and required inspections always stay on the list. A shorter list of PMs that matter gets done. A long list full of busywork teaches techs that skipping is fine.
2. How many PM hours can your crew really handle?
Add up the hours your PMs need each week and compare them with the hours your crew has left after breakdowns and projects.
Add up the hours your PMs need each week and compare it to the hours your crew has left after breakdowns and projects. If the PMs need more time than you have, something will get missed. Spread monthly PMs across the month instead of stacking them all on the 1st. If the hours still don’t fit, that’s a staffing or contractor conversation to have with management, not a reason to let PMs slip.
3. Who should own each preventive maintenance task?
Every PM should have a named person or crew, so someone is responsible when it slips.
A PM assigned to "maintenance" is assigned to nobody. Put a person or a crew on every PM, so there’s someone to ask when it slips. Owners also notice when a task is wrong or out of date, which keeps the list clean.
4. When should PMs be based on run hours instead of the calendar?
Use run hours, cycles or miles when equipment works harder in some seasons than others.
Equipment that runs harder in some seasons wears faster then. Where you can, tie PMs to run hours, cycles or miles instead of the calendar. eWorkOrders can schedule PMs by date or by meter reading, so a PM comes due when the equipment needs it.
5. Why should every PM include a checklist?
A checklist makes the PM faster to do right and gives you a record of what was done.
A PM that says "inspect pump" takes longer and gets done differently by every tech. Attach a short checklist with the steps, readings and pass/fail points. It’s faster to do right, and the completed checklist becomes your record. Our PM checklist templates are a good starting point.
6. How do you find out why PMs keep slipping?
Record a reason every time a PM is late, such as parts, access, production or labor, and look at the reasons each month.
Was it parts, access, production wouldn’t release the machine, or no labor? Make the reason a required field when a PM is closed late or deferred. After a month, the reasons show you what to fix, whether that’s stocking a part, scheduling with production or moving a PM to a quieter shift.
7. How often should you review overdue PMs?
Review overdue PMs every week with your crew leads and spend most of the time fixing the cause.
Put 15 minutes on the calendar each week to look at overdue PMs with the crew leads. Reschedule what’s late, but spend most of the time on the cause. And don’t let a good-looking number fool you: our article on what your PM compliance rate hides explains what to watch besides the percentage.
How Does a CMMS Help Stop Missed PMs?
A CMMS puts every PM on a schedule with an owner, a due date and a checklist, and shows what’s overdue at a glance. That makes the weekly overdue review a five-minute job instead of a hunt through spreadsheets.
- Calendar or meter-based PMs: PMs come due by date or by meter reading in eWorkOrders.
- Assigned to a person or crew: every PM has a name on it.
- Checklists on the work order: techs see the steps and record readings on a phone or tablet.
- Reasons and history: notes on late PMs and completed work stay with the asset, so you can see what keeps slipping (what to measure).
Frequently Asked Questions
Why do preventive maintenance tasks get missed?
Usually because the schedule needs more hours than the crew has after breakdowns, PMs have no clear owner, or the PM list is full of tasks nobody trusts. Parts and equipment access are the other common causes.
How often should we review overdue PMs?
Every week. A short weekly review with crew leads catches PMs before they become missed PMs and shows the reasons they slip, so you can fix the cause.
What’s the difference between a missed PM and a late PM?
A late PM gets done after its due date; a missed PM never gets done before the next one comes due. Track both. A lot of late PMs is an early warning that missed PMs are coming.
How can a CMMS help stop missed PMs?
A CMMS puts every PM on a schedule with an owner, a due date and a checklist, shows what’s overdue, and keeps a record of what was done and why anything slipped. That makes the weekly review quick.
Final Thoughts
Missed PMs are a planning problem, not a people problem. Clean up the list, size it to your crew, give every PM an owner and review what slips every week, and the completion rate takes care of itself.
Keep Every Job on Schedule and On Record
Start with our free PM checklist templates, and keep every PM on schedule with eWorkOrders. eWorkOrders has supported maintenance operations for over 30 years, serving teams at Honda and King River Packaging, rated 4.9 on Capterra and G2.
- U.S. Department of Energy, Federal Energy Management Program, Operations & Maintenance Best Practices Guide, Release 3.0, Chapter 5 (2010)
- Thomas, D. and Weiss, B., Economics of Manufacturing Machinery Maintenance, NIST Advanced Manufacturing Series 100-34 (2020)
Statistics are also summarized on our Maintenance & CMMS Statistics page. Standards and codes change; always follow the current edition your authority having jurisdiction requires and the equipment manufacturer’s instructions.
About the author: Janet Jaquis is Marketing Director at eWorkOrders, where she writes about maintenance strategy, asset reliability, and CMMS software for maintenance and facility teams.
