Most maintenance teams do not choose reactive maintenance as a strategy. It just happens — there is always a fire to put out, and "plan for next month" keeps getting pushed to next month.
But the cost of reactive maintenance is well-documented, and the gap between reactive and preventive teams is significant enough that making the transition is one of the highest-return investments a maintenance manager can make. This guide explains the difference, the economics, and how to make the shift practically.
What Is Reactive Maintenance?
Reactive maintenance (also called corrective or breakdown maintenance) is responding to equipment failure after it has happened. The equipment stops working → someone reports it → a technician is dispatched → the equipment is repaired.
This is sometimes the right approach. For non-critical equipment where failure has no safety consequences and parts are cheap, reactive maintenance is perfectly rational. You do not need to schedule preventive maintenance on a desk lamp.
The problem is that most maintenance teams apply reactive maintenance to everything by default, including equipment where failure is expensive, dangerous, or difficult to recover from quickly.
What Is Preventive Maintenance?
Preventive maintenance (PM) is performing maintenance tasks at regular intervals — time-based, usage-based, or condition-based — to prevent failures before they happen.
Time-based PM: Replace the filter every 90 days, regardless of condition. Simple to schedule and track.
Usage-based PM: Service the conveyor bearing every 2,000 operating hours. Requires tracking usage, but more accurately reflects actual wear.
Condition-based PM: Inspect when vibration readings exceed a threshold. The most efficient form, but requires sensors and monitoring infrastructure.
Most teams start with time-based PM and move toward usage-based as they mature.
The Cost Difference
The economics are clear, and consistently documented across industries:
Emergency repair premium: Emergency repairs cost 3–9× more than planned repairs. The premium comes from expedited parts shipping, overtime labour, and the cost of the failure itself — contaminated product, missed orders, customer penalties.
Downtime costs: Unplanned downtime in manufacturing averages $260,000 per hour (Aberdeen Research). Even for smaller operations, an unexpected production line stoppage for 4 hours is typically far more expensive than a $200 planned service.
Mean Time Between Failures (MTBF): Well-maintained equipment fails less often. Teams that implement structured PM programs typically see 20–40% reduction in failure incidents over 12 months.
Parts costs: Reactive maintenance tends to require complete component replacements; preventive maintenance catches wear early, often allowing cheaper interventions (regreasing, tightening, cleaning) instead of full replacements.
A simple example: A compressor that costs $15,000 to replace, with quarterly service at $400 per visit, has a 4-year payback horizon for PM even assuming PM prevents only one failure over that period.
Why Teams Stay Reactive
Understanding the barriers helps overcome them:
"We don't have time to plan." This is the maintenance version of "we're too busy driving to stop for petrol." PM looks like overhead until you account for the time spent on reactive repairs — which is typically 3–5× the time the same work would take as planned maintenance.
"We don't know what to schedule." Without a system, it is hard to know what assets exist, let alone what they need. Starting with a basic asset register — even an incomplete one — makes this tractable.
"Management doesn't support it." The language management understands is money. Calculating the cost of your last three emergency repairs and comparing to PM costs for those assets is usually compelling.
"Our current system can't handle it." A shared calendar and email cannot manage PM at scale. A CMMS (even a simple, cheap one) makes PM scheduling and tracking practical for teams of 3 to 30 people.
The 80/20 of Transitioning to Preventive Maintenance
You do not need to switch everything at once. The highest-impact approach:
Step 1: Identify your critical assets (Week 1)
Which assets, if they fail, cause the most damage? Look for:
- Equipment whose failure stops production or operations
- Assets with long lead times for parts
- Equipment with safety implications
- Assets with a history of expensive failures
This is typically 20–30% of your asset list but 80% of your downtime costs.
Step 2: Create PM schedules for critical assets (Week 2)
Start with manufacturer recommendations from the OEM manual as your baseline. Add tasks based on your failure history. For critical assets, err toward more frequent inspections at first; you can always extend intervals as you gather data.
Step 3: Use a CMMS to track it (Week 2–3)
Without tracking, PM becomes another whiteboard that fades. A CMMS makes PM schedules into automatic reminders, completion records, and compliance metrics. Most teams are fully set up in under two hours.
Step 4: Measure and adjust (Month 2 onward)
Track your PM compliance rate (what percentage of scheduled PM was completed on time) and your emergency repair rate. Both should improve over 3–6 months. Adjust PM intervals based on what you find.
Common PM Mistakes to Avoid
Too many schedules too soon. Starting with 80 PM schedules and failing to complete 60% of them is worse than 10 schedules with 95% completion. Start narrow, build the habit, expand.
Ignoring completion notes. The value of PM is not just that you did it — it is what you found. Technicians should note any abnormal findings. This data is gold for predicting future failures.
Not tracking parts used. If PM consistently uses a specific part, you should stock it. CMMS platforms link parts to work orders, making it easy to see what gets used and when.
Treating all equipment equally. Non-critical equipment does not need the same PM attention as production-critical assets. Focus your limited PM bandwidth where the consequences of failure are highest.
Frequently Asked Questions
What percentage of maintenance should be preventive vs reactive? World-class maintenance organisations target 80%+ planned maintenance (PM + planned corrective maintenance combined) with less than 20% reactive. Most teams starting out are at the opposite ratio. Moving to 50/50 within 12 months is a realistic and impactful goal.
How do I justify the cost of preventive maintenance to management? Calculate the total cost of your last 3–5 emergency repairs: parts, labour, overtime, production loss, and expediting costs. Compare this to the annual PM cost for the same assets. The ROI is usually clear within the first conversation.
What is a good CMMS for managing preventive maintenance schedules? Maintoro starts at $15/user/month with unlimited preventive maintenance schedules. There is a free plan for teams of up to 2 users. You can have your first PM schedules running within an hour of signing up — no professional services required.
Related reading
- Preventive maintenance complete setup guide — building the program from scratch
- Preventive maintenance checklist — practical PM task list
- Reduce equipment downtime — downstream impact of PM discipline
- PM schedule template — annual planner with intervals
- CMMS for manufacturing — PM-driven manufacturing operations