Preventive maintenance scheduling is the difference between a list of tasks and a programme: the tasks have triggers, the triggers raise work orders, the work orders fit the hours available, and the overdue list is read every day. Most programmes fail here rather than in the tasks, because a schedule that raises more work than the team can do produces deferral by arithmetic. This page says how to schedule maintenance so it runs, where scheduled preventive maintenance goes wrong, and what annual preventive maintenance needs that a monthly task does not.
Triggers: calendar, meter and season
Calendar triggers suit inspections and building plant: every week, month or quarter. Meter triggers suit anything that wears with use: every so many run hours, cycles or units, which needs a reading entered or fed. Seasonal triggers suit plant that runs part of the year. A CMMS holds all three and raises the work order when the trigger comes round; a log on a spreadsheet holds the calendar ones easily and the meter ones with a column and some discipline.
Levelling the load
A schedule copied from manuals puts every quarterly task in the same week. Spread them: stagger the start dates so that the weekly load is even, and check the total preventive hours against the hours the team actually has after reactive work. This site's worked example, 60 preventive jobs and 66 hours a month, is a load that fits a small team beside its reactive work; a schedule that needs twice the hours available will be half done, and the half not done is chosen by accident.
The weekly plan and the daily overdue list
Each week, the supervisor takes the work orders due, adds the corrective work from inspections, sets priorities and assigns them. Each day, the overdue list says what slipped. A task that slips two weeks running is a task the schedule cannot carry, and the honest fix is to lengthen its interval, drop it, or find the hours, rather than let it become permanent backlog. Reading the overdue list daily is the habit that keeps a schedule real.
Annual tasks and shutdowns
Annual preventive maintenance is different in kind: it usually needs the asset or the line down for hours or days, parts ordered in advance, a contractor booked, and a permit. The schedule has to raise it weeks ahead so that the planning happens, and the task needs a lead time field or a reminder task in front of it. A plant that is surprised by its own annual tasks has a schedule that only looks a week ahead.
Questions people ask about preventive maintenance scheduling
How far ahead should the schedule look?
A week for the working plan, a quarter for the load, a year for the shutdowns. A CMMS shows all three from the same tasks.
What if the team cannot do all the scheduled work?
Then the schedule is wrong for the team, and the fix is in the schedule: fewer or longer-interval tasks on the assets that matter least. A schedule that is never done is not a schedule.
Should reactive work be scheduled?
The corrective work found by inspection, yes, into the weekly plan by priority. Breakdowns cannot be scheduled, which is why the plan needs slack for them.