Maintenance planning and scheduling: how to build the plan

In one line

Planning defines what maintenance is needed and why; scheduling defines who does it, with what resources, when and how — they are two different steps, and mixing them up is one of the reasons a maintenance plan stays on paper.

What it is

The SENATI manual draws a line between two words that often get used as synonyms: planning is defining the what, why and what-for of maintenance — which jobs are needed and what objective they serve. Scheduling is defining who, with how much, when and how — assigning people, spare parts, a date and a sequence to jobs that are already defined. Planning is worked in cycles: one strategic (long-term, with the maintenance policy and objectives) and one operational (short-term, with the maintenance plan, work orders and day-to-day execution).

The 5 steps for scheduling maintenance

The manual lays out a 5-step process to go from "there's a maintenance problem" to concrete jobs on the calendar:

1. Analyze the current situation and set objectives. Gather the existing data on breakdowns, failures, repairs and losses (quality, energy, downtime), presented graphically to make the diagnosis easier. From there, set concrete numeric objectives, not generic ones.
2. Diagnose the problem. Before applying analytical techniques, secure the equipment's basic conditions: cleaning, lubrication, routine checks, tightening bolts. Only then use root-cause techniques — 5 Whys, FMEA, primary cause analysis, SMED when the problem is a changeover — so you don't just treat the symptom.
3. Schedule the activities. Define who, with how much, when and how: resources get assigned through work orders. Systematic maintenance (preventive, predictive) is planned, scheduled and executed in that order; corrective maintenance can be scheduled without having been planned, since the need comes up as you go; emergencies, by definition, cannot be scheduled at all.
4. Execute the work. From receiving the schedule or the emergency request, through sourcing spare parts and tools and assigning people, to putting the equipment back into service.
5. Control the activities. Verify that the preparation, the execution and the report back to the information system were done correctly — this is what feeds the next planning cycle.

Checklist for building a maintenance program from scratch

For a piece of equipment that does not yet have a program, the manual suggests this practical order:

• Find the manufacturer's original use-and-maintenance manual (or a similar one, if that exact one is not available)
• Leave a minimal good-use manual for the operators, including cleaning the equipment and its surroundings
• Start a history of breakdowns and incidents right away, even a simple one
• Define a list of checkpoints (lubricant levels, pressure, temperature, voltage) with their values, tolerances and how often to check them
• Build a lubrication plan starting with short intervals, and adjust them based on results until reaching the optimal intervals
• Review filters periodically instead of setting their replacement only by a manufacturer's hour count
• For wear components (belts, bearings, chains), don't take the manufacturer's maximum hours as the normal replacement interval — adjust it based on real load, temperature and speed, with input from operators and technicians
• Keep a minimum spare-parts stock equal to twice the manufacturer's delivery lead time, also accounting for periods like holidays
• Group preventive tasks that require stopping the equipment into the program, even if that means bringing forward some of the longer-interval ones, so the machine doesn't get stopped separately several times
• If there is no maintenance software, a simple Access database or an Excel sheet with each piece of equipment's history already improves the program's accuracy noticeably

How each piece of equipment gets identified

For each machine's history to be traceable, the manual recommends an Equipment Code made of four parts: Production System (the plant or facility), Operational System (the group of equipment that performs a function), Equipment and Class (its operational importance, which helps set execution priorities). The Maintenance Code adds to that the equipment's specific component, the maintenance unit, the responsible sector and the type of scheduled activity — these are the columns that later feed the Master Plan.

The Preventive Maintenance Master Plan

The Master Plan is the document that keeps the program running over time: it correlates each piece of equipment's code and name with the frequency of its tasks, the maintenance instructions, who is responsible and the cost center. In its manual version, it has 52 columns — one for each week of the year — where you mark whether the service scheduled for that week was carried out, rescheduled or canceled. It is the tool that lets you see, at a glance and for the whole plant, what was supposed to happen and what actually happened with each task.

Real example

The manual cites the case of a leading food company that, when setting its step-1 objectives, did not settle for a generic goal of "improving maintenance": it set a general objective of increasing Overall Equipment Effectiveness (OEE) by 8% in a year, and broke it down into specific, measurable objectives — increasing Mean Time Between Failures (MTBF) by 15% and cutting maintenance cost in the packaging section by 50%, both for the first year. It is exactly what step 1 explicitly asks for: objectives with numeric values, not aspirations without a metric.

What it is for

Separating planning from scheduling avoids a common mistake: scheduling dates for jobs whose real purpose is not actually clear. And having a Master Plan with weekly control makes it possible to catch, in time, when the program is being systematically missed — something a schedule that only lives in the supervisor's head never shows anyone else.

Benefits

• Turns a maintenance policy into concrete jobs, with equipment, date, owner and resources assigned
• The Master Plan's week-by-week control shows execution gaps while there is still time to fix them, not at year-end
• The per-equipment history (once coded) becomes the basis for future decisions: replacement, redesign, adjusting frequencies

Limitations to keep in mind

• Building the program from scratch (history, checkpoints, lubrication plan) takes time before it pays off — there is no way to skip that data-gathering stage
• Without an information system (even a simple spreadsheet), the Master Plan becomes unmanageable as soon as the plant has more than a handful of pieces of equipment
• The manufacturer's replacement intervals are a starting point, not the final answer — applying them without adjusting for the plant's real experience leads to replacing parts either too early or too late

In summary

Planning is deciding what maintenance is needed and why; scheduling is deciding who does it, when and how. The 5-step process connects both ends, the practical checklist works for building a program even when nothing exists today, and the Master Plan with its weekly control is what keeps that program from staying a good intention from month one.