Preventive maintenance: the complete guide for maintenance managers

What is preventive maintenance?

Preventive maintenance includes all maintenance operations planned in advance to prevent equipment from breaking down. Unlike corrective maintenance, which occurs after a failure, it anticipates wear and deviations. Here are the main types of preventive interventions:

• Systematic maintenance: operations performed at fixed intervals (time, number of cycles, etc.), according to a pre-defined schedule, regardless of the actual condition of the equipment.
• Condition-based maintenance: interventions triggered by crossing a measured threshold (temperature, vibration, pressure, etc.) using sensors or regular readings.
• Predictive maintenance: an analysis of operating data to estimate the probable date of failure and intervene just in time.
• Inspections and rounds: regular checks that allow for early detection of play, leaks, or abnormal heating.

When properly balanced, preventive maintenance finds the equilibrium between the cost of planned interventions and the cost, often much higher, of unplanned breakdowns.

Preventive, corrective, and predictive maintenance: what are the differences?

These approaches are often confused, even though they follow different logics. Distinguishing them helps build a coherent maintenance strategy.

Here is how to position them relative to each other:

• Corrective maintenance: repairs are made once the breakdown has occurred. Simple to implement, but it exposes the business to unplanned downtime and costs that are difficult to control.
• Preventive maintenance: maintenance is performed before the breakdown, according to a plan. It requires organization but smooths out costs and reduces unplanned downtime.
• Predictive maintenance: relies on data (sensors, history) to intervene only at the optimal time.
• Combined approach: in practice, most sites mix all three depending on the criticality of each piece of equipment.

The best practice is to reserve preventive and predictive maintenance for critical equipment and accept corrective maintenance for low-cost equipment with no impact on production.

How to implement a preventive maintenance plan?

Setting up an effective preventive maintenance plan requires a structured approach, from equipment inventory to intervention tracking. Here are the main steps to follow:

• Identify and prioritize equipment according to its criticality for production and safety.
• Define the maintenance operations, their frequency, and the parts involved for each piece of equipment.
• Schedule interventions, track their completion, and adjust the plan based on field feedback.

Each of these steps benefits from being supported by tools to avoid oversights and centralize information. This is precisely the role of a CMMS.

Perform an equipment inventory

A preventive maintenance plan always begins with a reliable inventory of the assets to be maintained. Without this foundation, it is impossible to plan correctly. Points to cover:

• Identification: name, reference, serial number, location, and manufacturer of each piece of equipment.
• Criticality: the impact of a breakdown on production, safety, and costs, to prioritize efforts.
• Documentation: manufacturer manuals, maintenance recommendations, and history of past interventions.
• Associated parts: necessary consumables and spare parts, with their references and suppliers.

An up-to-date inventory is the foundation upon which all subsequent maintenance plans rest.

Define maintenance procedures and schedules

Once the assets are known, you must precisely describe what needs to be done, when, and by whom. This is the heart of the preventive plan. To be defined for each piece of equipment:

• Maintenance procedures: a detailed list of tasks to be performed, step-by-step, with safety instructions.
• Frequencies: the periodicity of each operation, expressed in time or usage (hours, cycles, quantities produced).
• Resources: the skills, tools, and parts necessary to carry out the intervention under good conditions.
• Triggers: events or thresholds that launch a condition-based intervention in addition to the fixed schedule.

Clear procedures guarantee consistent interventions, regardless of which technician performs them.

Track and adjust the plan

A preventive maintenance plan is never static: it must evolve with feedback from the field. Tracking allows you to verify its effectiveness and improve it. Best practices:

• Traceability: record each intervention performed, its duration, the parts used, and the technician’s observations.
• Indicators: track the breakdown rate, schedule compliance, and the ratio between preventive and corrective maintenance.
• Breakdown analysis: identify recurring failures to strengthen or adapt preventive operations.
• Regular revision: adjust frequencies and procedures based on observed results.

It is this continuous improvement loop that makes the difference between a theoretical plan and a truly effective one.

The benefits of preventive maintenance

Preventive maintenance brings concrete and measurable benefits to industrial companies. Here are the main ones:

• Reduction of overall maintenance costs by avoiding more expensive emergency repairs.
• Extension of equipment lifespan through regular and appropriate maintenance.
• Improvement of availability and safety by limiting unplanned downtime and incidents.

By investing in prevention, companies transform an unavoidable expense into a controlled performance lever.

Reduction of maintenance costs

Cost reduction is one of the most immediate benefits of preventive maintenance. A planned intervention almost always costs less than an emergency repair.

Unplanned breakdowns lead to extra costs: interventions outside normal hours, rushed parts procurement, collateral damage to other components, and associated production losses.

By planning maintenance, workload is smoothed out, parts purchasing is better negotiated, and the escalation of a small deviation into a major failure is avoided.

Over time, this management translates into a more predictable and overall lower maintenance budget, which facilitates dialogue with the finance department.

Extension of equipment lifespan

Extending equipment lifespan is another major advantage of preventive maintenance. Regularly maintained equipment maintains its performance for longer.

Cleaning, lubrication, replacement of wear parts, and tightening of elements subject to vibration limit the progressive degradation of machines.

By delaying equipment replacement, companies reduce their capital expenditure and get a better return on their existing assets.

This longevity also has a positive impact on the environment by reducing waste production and the consumption of resources related to manufacturing new equipment.

In summary, maintaining is often much better than replacing, provided it is done at the right time and with a clear method.

Improvement of operational availability

Improving operational availability is undoubtedly the most visible benefit for production teams. Fewer breakdowns mean more useful operating time.

Every unplanned stop disrupts the schedule, mobilizes teams in an emergency, and can delay deliveries. Preventive maintenance reduces the frequency and unpredictability of these stops.

Since interventions are scheduled, they can be carried out during off-peak periods without impacting current production.

High availability allows for better fulfillment of customer commitments, optimization of resource use, and securing the overall performance of the site.

It is a decisive competitiveness factor for companies whose activity depends heavily on their equipment.

Which tools to manage preventive maintenance?

Managing preventive maintenance manually, on spreadsheets or paper, quickly becomes unmanageable as the asset base grows. Several types of tools help professionalize the approach:

• CMMS software: the central tool for planning, tracking, and analyzing all interventions.
• Performance indicators: dashboards that measure the effectiveness of the plan and guide decisions.

When well-chosen, these tools save precious time and transform scattered data into actionable information.

CMMS software

A CMMS (Computerized Maintenance Management System) is the reference tool for managing daily preventive maintenance. It centralizes all useful information. What it provides:

• Automatic scheduling: preventive interventions are scheduled and automatically reminded according to defined frequencies.
• Complete traceability: each piece of equipment has its own history of interventions, parts, and costs.
• Request management: users report problems, and technicians receive and process tickets in an organized manner.
• Data-driven management: dashboards facilitate breakdown analysis and plan adjustment.

A solution like Bob! Desk allows you to set all this up without complexity, while maintaining a clear view of all your sites and equipment.

Performance Indicators (KPIs)

To know if a preventive maintenance plan is working, it must be measured. A few key indicators are enough to track its effectiveness. The most useful ones:

• MTBF (Mean Time Between Failures): the more it increases, the more reliable the equipment is.
• MTTR (Mean Time To Repair): measures how quickly equipment is put back into service.
• Preventive maintenance rate: the share of planned interventions compared to corrective interventions.
• Availability rate: the percentage of time during which equipment is actually operational.

Tracked over time, these indicators allow for objective progress and justify maintenance investments.