What a reliability and maintenance supervisor does: look first, then fix once in the PM window
A reliability and maintenance supervisor walks the asset before the PM and uses sight, hearing, touch and smell to catch wear early, has the planner check stock and order parts before hand-over, puts the wear items and their inventory item numbers on the job plan, and replaces worn parts on condition while the machine is already locked out, so the work is done once, not in repeated follow-up visits.
What the role is for
A reliability and maintenance supervisor is the person who turns a PM schedule into fewer breakdowns. The job is not only to hand out work orders. It is to be on the plant floor early enough to see a problem while there is still time to plan for it, then to make sure the planner, the stores and the crew are ready when the machine is stopped.
Boots on the ground: use every sense
A screen shows what was entered last month. Walking the plant shows what is happening now. Most early warnings reach a person through the senses long before a sensor or a failure report does.
What each sense can catch
| Sense | What it catches early | Example on a PM walk-down |
|---|---|---|
| Sight | Cracks, glazing, fraying, leaks, rust, loose or missing fasteners, dust trails, misalignment marks | Belt sidewalls cracked or glazed, seen through the guard mesh before it is opened |
| Hearing | Bearing growl, belt squeal, rattle, air leaks, cavitation, a changed note | A bearing noise that was not there last week |
| Touch | Heat, vibration, looseness, a rough or dry feel (only where it is safe and the machine is guarded or stopped) | A housing warmer than its twin on the next line |
| Smell | Hot oil, burning rubber, overheated insulation, a refrigerant or process leak | Burnt rubber from a slipping belt drive |
| Taste | Rarely used. Only where the product itself allows it and the site rules permit, for example a sweet or chemical trace in a food or process area | Treat as a last resort, never as a routine check |
A belt drive example
On a mixer PM, the drive belts were seen to be cracked before the guard was removed. That gave the supervisor time to ask the planner to check stock and order replacements before the equipment was due back with production. Other worn parts were changed in the same window, parts that were not on the original plan. No follow-up work orders were needed and the risk of an unplanned stop on that mixer was lower.
Why replace on condition inside the window
Some plants raise a follow-up work order for every worn part found and never weigh the time study of simply changing it while the machine is already locked out. Compare the two routes.
What a second visit repeats
| Cost that every extra visit repeats | One visit with the repair inside the PM | Separate follow-up work order |
|---|---|---|
| Lock-out and verification of zero energy | Done once | Done again |
| Job hazard analysis and permits signed | Done once | Raised and signed again |
| Guards removed and refitted | Once | Again, and often a third time to test |
| Mechanic time | One crew already on site | A new crew, a new walk to the job |
| Production hand-over | Equipment returns once | A second stoppage, or a second wait for a slot |
| Risk the part fails before the follow-up date | None, it is already changed | Open until the work is done |
The pre-PM routine
| When | Who | What happens |
|---|---|---|
| A few days before the PM | Supervisor | Walk the asset while it runs. Look, listen, touch what is safe, smell. Note anything wear-related before the guard comes off |
| Same day | Planner | Check stock for every wear item on the list and for anything the walk-down found. Order what is missing and confirm the delivery date is before hand-over |
| Before lock-out | Planner and supervisor | Put the wear items and their inventory item numbers on the job plan, with the rule for each: inspect only, or replace on condition |
| During the PM | Mechanics | Inspect, then replace on condition from the kit staged at the machine. Log what was found and what was changed |
| After the PM | Supervisor | Record the finds on the work order. Update the job plan so the next PM starts with the right parts |
| Each quarter | Supervisor and planner | Review which parts were changed most often and adjust stock and intervals |
Put the parts on the job plan
Write the wear items that will be inspected and replaced on condition into the job plan, with the inventory item numbers and the rule for each. The planner can then confirm stock before lock-out, and mechanics do not remove and refit the guard several times. Reported experience from sites that did this is fewer follow-up work orders and shorter planned stops; your own numbers will differ.
Replace now or raise a follow-up?
| Situation found in the window | Usual choice | Why |
|---|---|---|
| A cheap wear item, visibly worn, in stock | Replace now | The time is already paid for. A later visit costs far more than the part |
| A wear item that is close to its limit but not past it | Replace now if the next window is far off; otherwise note and watch | Weigh the remaining life against the cost and delay of a second visit |
| The part is not in stock | Raise one follow-up with the delivery date. Mark the risk on the asset | Do not hold the machine for a part that is not there |
| The repair is larger than the window allows | Plan a separate stop, with the parts and crew booked | Rushing a big job in a short window creates new faults |
| Needs a design change or an engineering decision | Raise it to engineering with the evidence | Not a PM-window repair |
| An asset scoring Low on criticality | Inspect only, or run to failure | Do not spend window time on something that does not hurt the plant |
Link it to criticality
Condition-based replacement in the window pays most on assets that hurt when they stop. Score assets with a criticality matrix first, then apply the full routine to the Critical and High bands. Keep Low assets to light inspection.
What to measure
- Unplanned downtime hours on the asset, before and after
- Follow-up work orders raised per PM
- Guard removals per asset per quarter
- PM window overruns, in hours
- Share of wear items that were in stock on the day of the PM
- Hours of mechanic time spent re-doing lock-out and set-up
Limits to keep in mind
- Never put a hand near a guarded or moving part for the touch check. Use the site lock-out and safety rules.
- The window is finite. If the work will not fit, plan a separate stop, do not rush.
- Do not replace good parts just because the machine is open. Use the condition rule.
- Record what was found. A finding that is not written down is lost at the next shift change.
Questions
What does a reliability and maintenance supervisor do?
A reliability and maintenance supervisor plans and leads the work that keeps equipment running: they walk the plant, spot early signs of wear, direct the crew, work with the planner so parts and permits are ready, and review failures so the same fault does not return. The aim is fewer unplanned stops and shorter planned ones.
Why look at the machine before the PM starts?
A walk-down before the guard comes off gives lead time. If a belt, bearing or seal already looks worn, the planner can check stock and order the part before the equipment is handed over, so the repair happens inside the window instead of in a later stoppage.
Should worn parts be replaced during the PM or in a follow-up work order?
If the part is cheap, visibly worn, in stock and the window allows, replacing it during the PM is usually cheaper overall. The machine is already locked out, permits are signed and guards are off, so a separate visit would repeat all of that. Parts that are not in stock, or jobs that exceed the window, still need a separate planned work order.
How do I put parts on a job plan?
List the wear items to be inspected and replaced on condition, with their inventory item numbers, in the job plan for the PM. State the rule for each item. Then the planner can confirm stock before the PM and the kit can be staged at the machine.
Which assets should get this treatment first?
Start with assets that score Critical or High on a criticality matrix, because a second stoppage on those costs the most. Assets that score Low can be inspected lightly or run to failure.
How do I show that it works?
Track unplanned downtime hours, follow-up work orders per PM, guard removals per asset and window overruns for a few months before and after. Describe changes as observed, not guaranteed, because production, season and staffing also move the numbers.
The practice described here is general guidance. Follow your own site lock-out, permit and safety rules. Results vary by plant.
Related: Asset criticality matrix · PM topics in the tool · Condition monitoring · Lubrication guides