Unexpected breakdowns are every maintenance manager's nightmare. Production stoppages, emergency repair costs, operator safety risks: the consequences of failing equipment go far beyond simply replacing a part. Preventive maintenance is the structured response to this challenge, and it relies on a rigorous field-based approach.
This guide provides you with a complete checklist of 10 essential checkpoints, along with best practices for documenting your interventions and effectively tracking the condition of your equipment fleet.
Why preventive maintenance pays off
Corrective maintenance (intervening after the breakdown) costs on average 3 to 5 times more than planned preventive maintenance. Beyond the direct cost of repair, unplanned breakdowns result in production losses, delivery delays, and decreased customer satisfaction.
A well-structured preventive maintenance program allows you to:
- Reduce unplanned downtime by detecting signs of wear before failure occurs
- Extend equipment lifespan through regular and appropriate servicing
- Improve safety by identifying risks associated with aging equipment
- Optimize spare parts inventory by anticipating replacement needs
- Ensure regulatory compliance by meeting periodic inspection obligations
Companies that adopt a structured preventive maintenance program see an average reduction of 25 to 30% in overall maintenance costs and a 70% decrease in critical breakdowns on equipment covered by the program.
Building an effective preventive maintenance plan
Before deploying your field checklist, it is essential to structure your preventive maintenance plan. This rests on three fundamental pillars.
Equipment inventory and classification
Start by creating a comprehensive inventory of all relevant equipment. For each piece of equipment, record the essential information: reference, serial number, commissioning date, location, manufacturer, and operating conditions. Then classify your equipment by criticality: does a stoppage of this equipment halt production? Does it pose a safety risk? Is it easily replaceable?
Criticality analysis and intervention frequency
The frequency of preventive interventions depends directly on the equipment's criticality and its operating conditions. A motor running 24/7 in a dusty environment will require more frequent inspections than equipment used occasionally indoors. Rely on manufacturer recommendations, breakdown history, and the experience of your field technicians to define optimal intervals.
Planning and scheduling
Integrate preventive interventions into a global schedule. Consider production constraints, technician availability, and spare parts procurement lead times. Realistic planning is the key to a program that will actually be followed in the field.
The 10 essential checkpoints in the field
This checklist covers the fundamental checkpoints applicable to most industrial and technical equipment. Adapt it to the specifics of your fleet.
General visual inspection
Examine the overall condition of the equipment: signs of corrosion, cracks, deformations, visible leaks, dust or debris accumulation. Document each anomaly with an annotated photo.
Mechanical component lubrication
Check lubrication levels at all grease points: bearings, gears, chains, linear guides. Inspect lubricant quality (color, viscosity, contamination) and top up or replace as needed.
Alignment and mechanical clearances
Check the alignment of shafts, pulleys, and couplings. Measure mechanical clearances (bearings, guides) and compare them to manufacturer tolerances. Misalignment or excessive play is often a precursor to failure.
Electrical connections and wiring
Inspect all electrical connections: terminal tightness, cable insulation condition, absence of overheating or arcing traces. Use a thermal camera if available to detect hot spots.
Filters and filtration elements
Check the condition of all filters (air, oil, hydraulic, water). Measure the pressure differential if applicable. Replace clogged filters or those nearing their maximum service life. A blocked filter reduces performance and accelerates wear.
Belts, chains, and drive systems
Check the tension, wear, and alignment of belts and drive chains. Inspect pulley and sprocket teeth. Replace any element showing signs of fatigue: cracks, elongation, frayed edges.
Safety devices
Test the operation of all safety devices: emergency stops, door sensors, light curtains, torque limiters, safety valves. Each device must trigger the stop or protection under the intended conditions.
Calibration and adjustments
Verify the accuracy of integrated measuring instruments (pressure, temperature, flow sensors). Check operating parameter settings. Miscalibrated equipment consumes more energy and produces lower quality results.
Cleaning and clearance
Clean the equipment and its immediate surroundings. Remove dust buildup on fans and radiators. Clear maintenance access points and evacuation areas. Clean equipment runs better and lasts longer.
Documentation and intervention report
Complete the preventive maintenance report directly on-site: status of each checkpoint, measurements taken, actions performed, parts replaced, anomalies detected, and recommendations for the next intervention.
Field documentation best practices
Documenting your preventive maintenance interventions is just as important as the intervention itself. Without traceability, it is impossible to track the evolution of equipment condition, anticipate replacements, or demonstrate regulatory compliance.
What each intervention report should contain
- Equipment identification: reference, serial number, exact location
- Date and duration of intervention: precise timestamps for frequency tracking
- Attending technician: name and qualification of the professional
- Checkpoints verified: status of each point (compliant, to be monitored, non-compliant)
- Measurements taken: quantitative values with units and reference thresholds
- Actions performed: replacements, adjustments, cleaning carried out
- Before/after photos: visual documentation of anomalies and corrections
- Recommendations: actions to plan for the next intervention
Fill in your report directly during the intervention, not afterward. Observations noted in the moment are more accurate and complete than those reconstructed from memory at the end of the day. A mobile tool allows you to enter your findings, take photos, and generate the report in real time, even without an internet connection.
Tracking history and driving performance
The value of a preventive maintenance program is measured over time. To effectively steer your strategy, track the following key performance indicators (KPIs).
Essential preventive maintenance KPIs
- Preventive plan completion rate: percentage of preventive interventions actually performed vs. the initial plan. The target should exceed 90%.
- MTBF (Mean Time Between Failures): average time between two failures of the same equipment. An increase in MTBF indicates that your preventive program is effective.
- Preventive/corrective ratio: proportion of maintenance hours devoted to preventive vs. corrective work. Aim for a minimum 70/30 ratio.
- Maintenance cost per equipment: tracking expenses (labor, parts, tools) to identify the most costly equipment to maintain.
- Equipment availability rate: actual operating time compared to theoretical available time. The target depends on the sector, but 95% is a common benchmark.
The importance of intervention history
Every field intervention report feeds into the equipment's history. This history is your best tool for identifying degradation trends, adjusting intervention frequencies, and making informed decisions about equipment replacement or refurbishment. Without a reliable history, your preventive maintenance remains empirical and ineffective.
Digitizing your field preventive maintenance
Paper-based management of preventive maintenance interventions is a major obstacle to efficiency. Lost forms, illegible data, delayed entry, no photos: paper no longer meets today's requirements for traceability and responsiveness.
Concrete benefits of a digital tool
- Customizable checklists: create forms tailored to each equipment type, with specific checkpoints and reference thresholds
- Offline mode: enter your findings even in areas with no network coverage; data syncs automatically when you reconnect
- Photos and annotations: capture visual evidence directly from the app, add arrows and comments to clarify your observations
- Automatic PDF reports: generate a professional report in one click, ready to share with the client or archive in your CMMS
- Centralized history: instantly retrieve all past interventions on a given piece of equipment, with photos and measurements
- Alerts and reminders: never miss a maintenance deadline thanks to automatic notifications
With a tool like EasyReportGen, your field technicians have a complete solution for carrying out their preventive maintenance inspections, documenting each intervention, and building your equipment history. The result: fewer breakdowns, controlled costs, and flawless traceability.
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