Operator rounds and autonomous maintenance: the loop, the limits on the sheet, and the line between operators and maintenance
The loop an operator round runs from the route to the feedback, what makes a rounds sheet work and why the limit has to be on it, the seven steps to autonomous maintenance and why they are in order, where the line between operators and maintenance is drawn, and what happens to the readings. With a free rounds sheet template.
Key takeaways
- An operator round is a fixed route of checks made every shift by the people who are there every shift: look, listen, feel, smell, read, compare against a limit, act. It is the first line of condition monitoring and the cheapest.
- The round works when the limit is on the sheet. A reading compared against memory is a reading nobody acts on, and a sheet with no limits is a signature exercise.
- Autonomous maintenance is the TPM practice of operators owning the basic care of their equipment: cleaning, lubricating, inspecting, tightening and adjusting what needs no tool, no isolation and no part. It is built in steps, and the steps are in order for a reason.
- The line between what operators own and what maintenance keeps is drawn by the site, written down, and trained. Anything behind a guard, under an isolation or needing an instrument stays with maintenance.
- A round is only worth walking if someone reads the sheets. Maintenance acts on the notifications, reliability trends the readings and moves the limits, and the operator is told what became of what they found.
A lube oil filter's differential pressure gauge has been in the red for nine days when the crusher trips on low oil pressure. The gauge is beside the walkway the operators use four times a shift. Nobody looked, because nobody was asked to, and the one who did look did not know what red meant for that gauge. The failure was visible for nine days to the people who were there every shift, and it was found by the trip.
Operator rounds are the practice of asking. A fixed route, a check at each point, what normal looks like and the limit at which to act, written on the sheet, walked every shift by the people who are there every shift. Autonomous maintenance is the wider practice the rounds belong to, in which operators own the basic care of the equipment they run and maintenance keeps the work that needs a tool, an isolation or a part. This guide sets out the loop a round runs, what makes a rounds sheet work, the steps a site climbs to autonomous maintenance and why they are in order, where the line between operators and maintenance is drawn, and how the readings are used. A rounds sheet template comes with it.
It sits beside the condition monitoring guide, which covers the instrumented side, and the preventive maintenance program, which the rounds are a task in.
Free download
Operator rounds sheet template
A rounds sheet with the route point, the check, the method, what normal looks like and the limit at which the operator acts, a reading and an action against every point, ten worked points on a crusher and a conveyor, and the ownership line and the seven steps on sheets of their own.
The loop
A round is a loop with five steps, and the loop is what distinguishes it from a walk. The route fixes the sequence and the checks. The check is made by the senses or read from an instrument. The reading is compared against a limit on the sheet. The operator acts: initials and moves on, fixes what is theirs to fix, or raises a notification with the reading. And someone feeds back: maintenance tells the operator what the notification became, and reliability trends the readings and moves the limits where the trend says they are wrong.
The compare step is the one that matters and the one most often missing. A reading compared against the operator's memory of what it usually is depends on the operator, and a new operator has no memory. A reading compared against a limit on the sheet depends on the sheet, and the sheet can be improved. The nine days in the red were nine days without a limit anyone had been given.
1Route
A fixed sequence of points, each with the checks to make there, walked at a set frequency
Needs
The route sheet, with the limits on it
2Check
Look, listen, feel, smell, read: a reading from a gauge, a state from a sight glass, a condition from a hand on a bearing housing
Needs
The method on the sheet, and the operator trained in it
3Compare
Against the normal range and the limit on the sheet, not against memory
Needs
A limit per check, set by maintenance and reliability
4Act
In range: initial and move on. Out of range: fix it if it is the operator's to fix, otherwise raise a notification with the reading
Needs
A clear line between what operators fix and what they report
5Feed back
Maintenance tells the operator what the notification became. Reliability trends the readings and moves the limits
Needs
Someone reading the sheets, and the readings in a system, not a drawer
→ Every shift, by the people who are there
← Back to the route, with the limits moved from what was learned
The limit on the sheet is the difference between an inspection and a walk.
What makes the sheet work
A rounds sheet has a row per point and a few columns, and the columns are chosen so that an operator who has never seen the equipment could walk the route and act correctly. The point gives the order. The check says what to look at. The method says how: look, listen, feel, smell, read. Normal says what good looks like, in words or a range. The limit says when to act. The reading records what was found, and the action records what was done with it. The columns are the template's, and its ten worked points are a shift's round on the crusher and the conveyor, including the filter that was in the red.
Three things keep the sheet honest. The checks are chosen because a failure mode shows there first, which means they come from the equipment's failure history and the FMECA where there is one, not from a generic list. The limits are set by maintenance and reliability, from the history, and reviewed when the readings are trended. And the sheet is trimmed: a point that has never found anything in a year is either moved to a longer frequency or removed, so that the round takes the time the shift has.
| Column | What goes in it |
|---|---|
| Point | The order the route is walked |
| Equipment | The tag |
| Check | What is checked, in one line |
| Method | As it says |
| Normal | What good looks like, or the normal range |
| Limit | The value or condition at which the operator acts |
| Reading / finding | The number, or the condition in a word |
| In range | As it says |
| Action | Fixed on the round, or the notification number raised |
| Initials | As it says |
The steps to autonomous maintenance
Autonomous maintenance is built in steps, and the steps are in order because each makes the next possible. The initial clean is done by operators and maintainers together, to the metal, and tags every defect found, which is usually a long list and the first time the equipment has been looked at that closely. The second step removes what made it dirty: the leaking gland, the missing seal, the cover that takes an hour to get off. Only then is the standard written, because a standard for cleaning equipment that is contaminated every shift is a standard for a job that never ends. The fourth step trains operators in what the equipment does and how it fails, so that a reading means something to them. The fifth is the round itself, run from the standard with the limits. The last two make it stick and make it theirs.
Sites that start at step five, handing operators a rounds sheet for equipment that has never been cleaned or understood, get a round that is walked and not read. The order is the method. The table gives the steps after the TPM model, which the Japan Institute of Plant Maintenance set out and which most sites adapt.
| Step | Name | What is done | What it produces |
|---|---|---|---|
| 1 | Initial clean and inspect | Operators and maintainers clean the equipment to the metal together, and tag every defect found | A long defect list, and equipment that can be inspected at all |
| 2 | Remove the sources | Find and fix what makes it dirty, leaks or inaccessible: a missing guard seal, a dripping gland, a cover that takes an hour to remove | Cleaning time falls; the defects stop coming back |
| 3 | Set the standards | Write the cleaning, lubrication and inspection standard: what, where, how, how often, how long, with photographs | A standard the round is built from |
| 4 | General inspection | Train operators in the equipment's functions and failure modes, so they know what a reading means | Operators who can tell a problem from a number |
| 5 | Autonomous inspection | Operators run the round from the standard, with the limits, and raise what is outside them | Defects found early, by the people who are there every shift |
| 6 | Organise the area | Tools, lubricants, spares and labels in place; the area and the sheet kept as a working system | A round that takes the time it should |
| 7 | Own it | Operators improve the standard from what they find; the measures are theirs | Equipment that stays in condition between maintenance visits |
What operators own and what maintenance keeps
The line is drawn by the site, and the drawing of it is most of the argument about autonomous maintenance. The usual division is in the table: operators own cleaning, lubricant levels and top-ups, readings, tightening and adjustments that need no tool, no isolation and no torque setting, and noticing and reporting. Maintenance keeps anything behind a guard, under an isolation or a permit, needing an instrument, a torque or a part. Reliability and maintenance set the limits, trend the readings and change the standard. Where a site puts belt tracking, skirt adjustment and spray nozzles is a decision, and the deciding factors are the training, the authorisation and the safety system.
The line is written down, trained and respected in both directions. Operators are not asked to do what needs a skill they have not been given, and maintenance does not stop cleaning and lubricating because operators now do some of it. The work order process is where the two meet: an operator's notification with a reading is a better work request than most, and the feedback on what it became is what keeps the operator raising them.
| The work | Who owns it | Why |
|---|---|---|
| Cleaning the equipment and its area, and keeping it clean | Operators | Dirt hides defects and causes them |
| Topping up lubricant and checking levels, where it needs no tool and no isolation | Operators | The most common cause of bearing failure is lubrication, and the operator is there every shift |
| Reading gauges, sight glasses and local displays, and recording them | Operators | A trend needs regular readings; maintenance is not there regularly |
| Tightening what has worked loose, where it needs no isolation and no torque setting | Operators | Looseness found and fixed before it becomes vibration |
| Noticing and reporting: noise, heat, smell, leaks, tracking, wear | Operators | The first line of condition monitoring |
| Adjusting: belt tracking, skirt rubbers, spray nozzles, where trained and authorised | Operators, where the site decides so | Fast correction of the things that drift |
| Anything behind a guard, needing an isolation, a permit, a torque, a measurement with an instrument, or a part | Maintenance | Skills, tools and the safety system |
| Setting the limits, trending the readings, and changing the standard | Reliability and maintenance | The round finds; the engineer decides what it means |
Operators own what needs no tool, no isolation and no part. Maintenance keeps the rest, and sets the limits for both.
What happens to the readings
A round produces two things: notifications, which go to maintenance and become work, and readings, which go somewhere and become a trend or go in a drawer and become nothing. The readings are the part most sites waste. A lube oil temperature read every shift for a year is a condition monitoring record as good as any instrument's, if it is in a system where it can be trended. Mobile rounds tools, the CMMS's own meter readings, or a sheet keyed in once a day all work. The drawer does not.
Reliability reads the trends and does two things with them. It moves the limits, tightening the ones that are never approached and loosening the ones that are crossed every week without consequence. And it feeds the findings into the preventive maintenance program: a point that keeps finding the same defect is a task interval that is wrong or a design problem for root cause analysis. The condition monitoring software piece covers getting readings from the floor to the people who act on them, and rounds readings travel the same path.
Where rounds fail
- No limits on the sheet, so every reading is compared against memory and new operators have none.
- Checks from a generic list rather than from the equipment's failure modes, so the round looks at the wrong things.
- The round started at step five, on equipment nobody has cleaned or explained, and walked without being read.
- Readings written on paper and filed, so a year of shift-by-shift condition data produces no trend.
- Notifications raised and never answered, so the operators stop raising them.
- The line between operators and maintenance undrawn, so each assumes the other is lubricating the bearing.
- A round so long it cannot be done in the shift, so it is signed rather than walked.
- Limits set once at commissioning and never moved, whatever the readings have shown since.
Common questions
What is an operator round?
A fixed sequence of inspection points walked by an operator at a set frequency, usually each shift, with specific checks at each point: a level read from a sight glass, a pressure from a gauge, a temperature from a hand on a housing, a noise, a leak, a belt's tracking. Each check has what normal looks like and a limit at which the operator acts, either by fixing it on the spot if it is theirs to fix or by raising a notification with the reading. The readings are recorded and trended.
What is autonomous maintenance?
One of the pillars of total productive maintenance: operators taking ownership of the basic care of the equipment they run. Cleaning it and keeping it clean, checking and topping up lubricants, inspecting against standards, tightening and adjusting what needs no tool or isolation, and reporting what they find. It is built in steps, from an initial clean and inspect, through removing the sources of contamination and setting standards, to operators running and improving the inspection themselves. The Japanese term is jishu hozen.
What should operators check on a round?
What tells them the equipment's condition and what they can do something about: lubricant levels, pressures and temperatures on local gauges, the condition of sight glasses and filters, bearing housings by hand, noise and vibration by ear and hand, leaks, belt tracking and idlers, skirts and spillage, guards and covers, the state of the area. Each check is chosen because a failure mode shows there first, and each has a limit set by maintenance or reliability from the equipment's history.
What is the difference between operator rounds and condition monitoring?
Rounds are condition monitoring by the senses, every shift, by the people on the floor, against limits on a sheet. Instrumented condition monitoring is by vibration analysers, oil samples, thermal cameras and online sensors, less often but more precisely, by specialists. They cover different failure modes at different stages: a round finds the leak, the loose guard and the hot bearing today, and the vibration route finds the bearing defect months before the operator could feel it. A plant needs both, and the round is the cheaper and the earlier.
How often should operator rounds be done?
Usually once a shift for the plant's running equipment, with some points more often where the failure develops fast, such as a lube oil pressure, and some less often where it does not. The frequency of each point is set from how quickly the condition it checks can change, not from how long the round takes. A round that takes longer than the shift allows is trimmed by removing points that never find anything, not by walking faster.
Who sets the limits on an operator rounds sheet?
Maintenance and reliability, from the equipment's history, the manufacturer's data and the site's experience, and they change the limits as the readings are trended. An operator reports against the limit and does not have to interpret the reading. That is the point: a round where the operator decides what is normal depends on which operator, and a round where the sheet says what normal is depends on the sheet, which can be improved.
Key terms
Plain-language definitions from our glossary for the concepts this article leans on.
Standards and further reading
- ISO 17359:2018 Condition monitoring and diagnostics of machines: general guidelines (ISO)
- ISO 14224:2016 Collection and exchange of reliability and maintenance data for equipment (ISO)
- BS EN 13306:2017 Maintenance: maintenance terminology (BSI)
- ISO 55001:2024 Asset management system requirements (ISO)
- Best practices, metrics and guidelines for maintenance and reliability (SMRP)
Related case studies and tools
- Predictive maintenance and condition monitoring (case study)
Related reading
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