Preventive Maintenance: Staying ahead of failures
Reactive maintenance (corrections and breakdowns) reacts to problems.
Preventive maintenance tries to avoid them.
Preventive Maintenance in P4 is designed to:
reduce unexpected breakdowns,
stabilize equipment availability,
shift maintenance from urgent to planned work.
The goal is not perfection.
The goal is fewer surprises.
What is preventive maintenance in P4?
Preventive maintenance is maintenance that:
is triggered before a failure happens,
is based on time or condition,
creates Maintenance Orders automatically.
In P4, preventive maintenance is driven by Preventive Plans.
Preventive Plans define:
when maintenance should happen,
why it should happen,
Execution still happens the same way:
via Maintenance Orders,
assigned to technicians,
logged and reported.
Prevention changes how orders are created, not how they are executed.
Preventive Plans: the core concept
A Preventive Plan is a set of rules.
Each plan can be:
assigned to one or more pieces of Equipment,
triggered by time,
triggered by measuring points,
or both.
Preventive Plans answer:
When should maintenance be triggered automatically?
They do not:
execute work,
assign technicians,
replace planning decisions.
They only create Maintenance Orders at the right time.
Two ways preventive maintenance is triggered
Preventive Plans work using two main trigger types.
1. Time-based preventive maintenance
Time-based prevention is the simplest form.
Typical examples:
monthly inspection,
quarterly lubrication,
annual calibration.
A time-based plan defines:
frequency (e.g. every month),
lead time (how early the order is created).
Example:
maintenance is due on the 15th,
the order is created on the 8th,
planners have time to assign and prepare.
Time-based prevention creates predictability.
2. Condition-based preventive maintenance (Measuring Points)
Condition-based prevention reacts to equipment behavior.
Triggers are based on:
temperature,
pressure,
vibration,
operating cycles,
counters or sensor values.
When a defined threshold is reached a Maintenance Order is created automatically.
This allows maintenance to react to real usage, not just calendars.
Shift factor: keeping intervals consistent
Preventive maintenance rarely happens exactly on schedule.
Orders may be:
completed earlier,
delayed due to production,
postponed for valid reasons.
P4 handles this using a Shift Factor.
Shift Factor:
shifts future preventive orders,
keeps intervals consistent,
prevents drift over time.
This avoids:
maintenance slowly moving away from reality,
uncontrolled clustering of orders.
What happens when a preventive trigger fires?
When a preventive condition is met:
a Maintenance Order is created automatically,
the order is clearly marked as preventive,
it enters the normal maintenance flow.
From that point:
planners assign it,
technicians execute it,
execution is logged,
results are reported.
Preventive Orders are not special during execution.
They follow the same rules as any other order.
Preventive maintenance and reactive maintenance together
Preventive maintenance does not eliminate failures.
In reality:
preventive work reduces frequency,
reactive work still exists,
both flows run in parallel.
P4 is designed to handle this mix:
preventive orders stabilize workload,
reactive orders handle reality.
Good maintenance is not “only preventive”.
It is balanced.
Common first mistakes with preventive maintenance
Creating too many preventive plans
Start small. A few good plans beat many bad ones.
Using preventive plans as reminders
Preventive plans create orders, not notifications.
Ignoring execution quality
Poorly logged preventive work has no value.
Expecting immediate improvement
Preventive maintenance shows results over time.
These mistakes are normal during early adoption.
When to start preventive maintenance
Preventive maintenance works best when:
basic reactive maintenance is already stable,
execution and logging are understood,
equipment structure is reasonably clean.
If execution is chaotic:
prevention will amplify chaos, not reduce it.
Start prevention after the basics are under control.
What you should be able to do now
After completing this step, you should:
understand how preventive maintenance works in P4,
know the difference between time-based and condition-based prevention,
understand how preventive orders are created,
see how preventive maintenance fits into the overall maintenance flow.
Next step
Monitoring & Reporting: Understanding maintenance results
This is where executed maintenance turns into insight, KPIs, and continuous improvement.