Introduction: Why Most Planned Maintenance Systems Fail
Many plants believe they are practicing Planned Maintenance.
They have PM checklists. They have calendars. They have CMMS schedules.
Yet breakdowns continue.
Maintenance teams remain overloaded.
Shutdowns overrun.
Spare parts are always “urgent.”
And firefighting never really stops.
The problem?
Most organizations implement maintenance activities — not a maintenance system.
True Planned Maintenance (Keikaku Hozen) is not about scheduling tasks. It is a structured reliability framework that eliminates failure modes, stabilizes equipment conditions, and aligns maintenance strategy with business risk.
For TPM practitioners and industry leaders, this distinction is critical.
1. What Planned Maintenance Really Means in TPM
In the TPM framework, Planned Maintenance (Keikaku Hozen) is the pillar responsible for:
- Eliminating breakdowns
- Reducing chronic losses
- Improving MTBF
- Reducing MTTR
- Stabilizing equipment conditions
- Optimizing lifecycle cost
It is a system that transforms maintenance from reactive repair to controlled asset management.
The Most Common Misinterpretation
Many plants reduce Planned Maintenance to:
- Monthly PM checklists
- Time-based replacements
- Routine inspections
This leads to:
- PM overload
- Little risk prioritization
- No link to failure modes
- Recurring breakdowns
That is not Keikaku Hozen.
Keikaku Hozen is about selecting the right strategy for each failure mode, based on criticality and risk.
2. The Strategic Purpose of Planned Maintenance
A mature Planned Maintenance system must deliver measurable outcomes:
1. Zero Chronic Breakdowns
Not by reacting faster — but by preventing recurrence.
2. Controlled Maintenance Cost
Emergency work is expensive. Planned work stabilizes labor and parts usage.
3. Lifecycle Cost Optimization
Maintenance decisions must consider total equipment life cost — not just current repair expense.
4. Stability in OEE
Planned Maintenance directly influences:
- Availability
- Performance
- Quality stability
3. The System Architecture of Planned Maintenance
A strong Planned Maintenance Pillar includes these structural elements:
A. Equipment Criticality Classification
Not all assets are equal.
Classify equipment:
- A-Class: Safety-critical, bottleneck, long recovery time
- B-Class: Moderate impact
- C-Class: Low operational impact
Without this step, maintenance effort becomes diluted.
B. Failure Mode Identification
For A-class assets especially:
- Conduct breakdown Pareto analysis
- Identify dominant failure modes
- Understand physical causes
- Document early warning signs
If failure modes are not mapped, strategy selection becomes guesswork.
C. Maintenance Strategy Selection
Each failure mode should drive strategy:
| Failure Pattern | Best Strategy |
|---|---|
| Predictable wear-out | Time-based PM |
| Measurable degradation | Condition-based (PdM) |
| Low risk, low cost | Run-to-fail |
| Recurring design weakness | Design-out / Improvement |
Planned Maintenance is about logic — not habit.
4. Practical Example: Maintenance Strategy Matrix
A real-world application looks like this:
| Asset | Criticality | Failure Mode | Strategy | Trigger | Owner |
|---|---|---|---|---|---|
| Main Air Compressor | A | Bearing wear | Vibration monitoring | Monthly trend | Reliability Eng. |
| Gearbox (Bottleneck Line) | A | Gear pitting | Oil analysis + inspection | Quarterly | Maintenance Supv. |
| Cooling Pump | B | Seal leakage | Visual inspection | Monthly | Technician |
| Non-critical Motor | C | Winding burnout | Run-to-fail + spare | On failure | Maintenance Team |
Notice:
- A-assets get predictive focus.
- C-assets don’t consume unnecessary inspection hours.
- Effort aligns with risk.
This prevents both over-maintenance and under-protection.
5. Breakdown Elimination Process
Breakdowns must be treated as defects — not events.
Every major breakdown should follow:
- Immediate restoration
- Root cause analysis
- Countermeasure implementation
- Update of maintenance standard
- Monitoring for recurrence
If standards are not updated, the system is incomplete.
6. Planning & Scheduling Discipline
Even a strong strategy fails without execution discipline.
Key elements:
- Weekly frozen schedule
- 70–80% planned work ratio
- Pre-kitted parts
- Defined job scope
- Estimated labor hours
- Field feedback loop
Planning removes friction before work begins.
7. Condition Monitoring Done Correctly
Predictive maintenance fails when:
- Data is collected but not acted on
- Alarm limits are undefined
- Responsibility is unclear
A strong PdM loop includes:
- Defined measurement points
- Clear thresholds
- Assigned reviewer
- Automatic job creation
- Post-repair validation
Start with high-impact assets — not plant-wide rollout.
8. Lubrication Excellence
Lubrication issues cause a large percentage of mechanical failures.
Build:
- Lubrication map
- Contamination control standards
- Color coding
- Correct quantity specification
- Oil analysis for critical assets
“Too much grease” is as damaging as too little.
9. Spare Parts Strategy
Spares must align with risk.
Categories:
- Critical long-lead items
- Insurance spares
- Fast-moving consumables
- Obsolete inventory
Without structured spare logic, MTTR suffers.
10. Skills and Capability Building
Planned Maintenance requires:
- Skill matrix by equipment type
- Certified tasks (alignment, balancing, vibration)
- Coaching system
- Failure-mode education
Without capability growth, firefighting returns.
11. KPIs That Matter
Track:
- MTBF
- MTTR
- Breakdown minutes
- % Planned work
- Schedule compliance
- Maintenance cost per unit
- Recurrence rate of top failures
These indicators reflect system health.
12. Common Pitfalls in Planned Maintenance
- PM overload without logic
- No linkage between breakdowns and standards
- Weak AM–PM collaboration
- Spare chaos
- Data collected but not used
Maturity requires discipline and leadership.
FAQs on Planned Maintenance
1. Is Planned Maintenance the same as Preventive Maintenance?
No. Preventive Maintenance is one method within the broader Planned Maintenance system.
2. What is the biggest mistake organizations make?
Treating PM schedules as a solution instead of analyzing failure modes.
3. How quickly can results be seen?
Improvements in breakdown trends often appear within 3–6 months when properly structured.
4. Should small plants implement full PdM?
Start with critical assets first. Expand based on ROI.
5. How does Planned Maintenance affect OEE?
It stabilizes availability and reduces performance losses.
6. What is the first step to improve maturity?
Create an asset criticality list and breakdown Pareto.
Conclusion
Planned Maintenance (Keikaku Hozen) is not about more work — it is about smarter work.
It replaces:
- Firefighting
- Emotional decision-making
- Spare panic
- Shutdown surprises
With:
- Risk-based strategy
- Failure-mode logic
- Standardized execution
- Data-driven reliability
For TPM practitioners, Maintenance Heads, and Plant Managers, Planned Maintenance is the foundation of operational stability.
When built correctly, it doesn’t just reduce breakdowns — it changes the culture of maintenance.