From Firefighting to Planned Maintenance: PM Compliance, Spares and Criticality

The maintenance team is good at what it does. That is part of the problem. They are so good at recovering from breakdowns that the whole plant has come to rely on it. Most of the week goes to emergencies. Preventive maintenance gets pushed “until next week,” and next week brings its own emergencies. The work-order backlog grows every month.

Then a critical machine goes down and the needed part is not on the shelf. Someone drives across the state to get one, or it is flown in overnight at a premium. Meanwhile, the storeroom is full of parts for equipment that was scrapped years ago.

If this sounds familiar, you are not dealing with a people problem or even a budget problem. You are dealing with a system problem. Reactive maintenance is self-reinforcing: breakdowns consume the time that should go to prevention, which causes more breakdowns. Breaking the cycle requires a deliberate plan. This guide lays one out.

How to tell how deep the hole is

Before you fix anything, measure where you stand. Five numbers give a clear picture:

• Planned vs. reactive ratio. What share of maintenance labor goes to planned work (PMs, scheduled repairs, improvements) versus unplanned breakdown work? Mature operations do the large majority of their work as planned. Many struggling plants have that ratio inverted.
• PM compliance. Of the PMs scheduled in a period, how many were completed on time? Late PMs count as missed — a PM done three weeks late protects very little.
• Backlog. How many weeks of work are waiting, and is it growing or shrinking?
• MTBF (mean time between failures). How long, on average, does critical equipment run between breakdowns?
• MTTR (mean time to repair). How long does it take to restore equipment once it fails, including waiting for parts and technicians?

Start with your ten most critical assets. You do not need plant-wide data to begin, and focusing narrowly makes the numbers more reliable.

Step 1: Rank equipment by criticality

You cannot plan everything at once, and trying to is a common reason maintenance improvement stalls. Criticality ranking tells you where to focus first.

Score each asset on the consequences of its failure:

• Safety and environmental impact
• Quality impact — does failure or degradation cause defects?
• Delivery impact — is it a constraint? Is there a backup?
• Cost impact — repair cost, lost production, scrap
• Failure frequency and time to repair

Combine these into a simple ranking — typically three tiers: critical, important, and run-to-failure acceptable. Build it with production, quality and maintenance together so the result is trusted. The ranking will drive PM priority, spares strategy, work-order priority and improvement focus.

One important consequence: some equipment should be deliberately run to failure. If an asset is cheap, non-critical and easy to replace, spending PM hours on it takes time away from assets that matter. Making that choice explicit frees capacity.

Step 2: Protect planned time for critical assets

The hardest part of escaping reactive maintenance is finding the time to do planned work when breakdowns consume everything. The answer is to start small and protect it fiercely.

Reserve a defined amount of technician time each week for PMs on the critical tier only. Treat those hours as non-negotiable except for genuine safety emergencies. As breakdowns on critical assets decline, the freed-up time funds planned work on the next tier. This is how the ratio shifts — gradually, then noticeably.

Step 3: Optimize the PMs themselves

Many PM programs are cluttered with tasks that add little value. Others miss the failure modes that actually cause breakdowns. Review PMs for critical assets with a few questions:

• What failure modes cause most of the downtime on this asset? Does the PM address them?
• Is each task preventing a failure, detecting early signs of failure, or neither?
• Is the frequency based on evidence (failure history, runtime, condition) or just the calendar?
• Could any inspection tasks be done by operators during normal operation?
• Are the instructions clear, with specific acceptance criteria rather than “check condition”?

Removing low-value tasks and adding the right ones often improves reliability while reducing total PM hours.

Step 4: Plan and schedule the work

Planning and scheduling are separate disciplines, and both matter. Planning means preparing each job before it is assigned: scope, steps, parts, tools, permits, estimated hours. Scheduling means assigning prepared jobs to specific people and time windows, coordinated with production.

A technician who arrives at a job with the parts, tools and instructions ready is far more productive than one who spends half the job looking for them. A weekly schedule agreed with production turns maintenance windows from arguments into routines.

Measure plan vs. actual: of the work scheduled for the week, how much was completed as planned? This is one of the most revealing numbers in maintenance. Low plan-vs-actual usually means breakdowns are still overriding the plan, jobs are poorly prepared, or production is not releasing equipment as agreed.

Step 5: Fix the spares strategy

The spare parts problem — the right part never on the shelf, the wrong parts everywhere — comes from managing all spares the same way. The fix is to manage them by criticality.

For critical-asset spares

• Identify the parts whose failure would stop a critical asset, especially long-lead or single-source parts.
• Set min/max levels based on failure history, supplier lead time and consequence of a stockout.
• Make sure stored parts are identified, protected and actually usable (some parts degrade on the shelf).
• Link parts to assets and PMs in the maintenance system so kits can be prepared in advance.

For everything else

• Review slow-moving and obsolete inventory — parts for equipment no longer in service, duplicates, and items with no usage for years.
• Decide what to keep, return, sell or write off, with finance involved.
• Consider supplier-held stock or standard catalog items for common, non-critical parts.

The result is usually a storeroom with a lower total value but much better availability of the parts that actually matter.

Step 6: Attack repeat failures with root cause analysis

If the same asset keeps failing the same way, repairing it faster is not the answer. Pick the worst repeat failures on critical equipment and run a structured root cause analysis — 5 Whys, fishbone diagrams, or failure analysis — and implement a fix that eliminates or detects the cause. One eliminated chronic failure can free more technician hours than any scheduling improvement.

Step 7: Bring operators in with TPM

Total Productive Maintenance (TPM) recognizes that the people who run equipment every day are best placed to notice early signs of trouble. Autonomous maintenance gives operators a defined role:

• Basic cleaning, inspection and lubrication routines, done as part of their shift
• Abnormality tags to flag leaks, noises, loose fasteners or other issues early
• Visual controls — gauge markings, match marks, lubrication points — that make abnormal conditions obvious

This is where workplace organization earns its place: a clean, organized machine is one where problems are visible. But operator care only works when maintenance responds to the tags operators raise. If tags are ignored, the routines will die quickly.

For a broader overview of TPM’s pillars, see our Total Productive Maintenance guide.

Step 8: Build the weekly maintenance rhythm

Sustained improvement depends on a simple, repeated cadence:

• Weekly scheduling meeting with production to agree the coming week’s planned work and equipment windows
• Weekly review of plan vs. actual, PM compliance, backlog and top breakdowns
• Monthly review of MTBF, MTTR, spares availability and progress on repeat failures

Keep the metrics visible and the meetings short. The purpose is to catch drift early and keep planned work protected.

Do we need a new CMMS?

Usually not first. Most plants already have a computerized maintenance management system that is under-used. Clean asset data, a criticality ranking, disciplined work-order practice and clear priority rules matter far more than which software you use. Once the process is working, the system’s limitations become clear and any upgrade decision is much better informed.

Common mistakes

• Trying to fix everything at once instead of starting with the critical tier
• Letting planned time be raided for non-critical emergencies
• Keeping PMs nobody has reviewed in years
• Stocking spares by habit instead of by criticality and lead time
• Launching operator care without maintenance follow-through on abnormality tags
• Buying software to solve a process problem

How QMSLean helps

We baseline your planned-vs-reactive ratio, PM compliance, backlog, MTBF and MTTR; build the criticality ranking with your team; optimize PMs; set spares min/max by criticality; launch operator care; and run root cause on repeat failures. Then we hand your planners a weekly rhythm they run without us and help extend the model to the next tier of assets.

See our situation page: “Maintenance is all firefighting. PMs slip, and the spare is never on the shelf.” Related reading: how to find the capacity you already have.

Tell us what’s going on

Describe your maintenance situation and a Lean practitioner will reply with how we would approach it. Request a Situation Review, try the free ROI Calculator, or contact us at [email protected].