How TPM Reduces the Six Big Losses in Manufacturing

Ask any experienced TPM consultancy where a plant quietly bleeds capacity, and the answer is rarely a single dramatic failure. It is the steady drip of small losses that never reach the morning report: a line that crawls after a changeover, a sensor that jams twice an hour, a machine that runs a shade below its rated speed because someone decided slower felt safer. Total Productive Maintenance, or TPM, gives these losses a name and a structure. It sorts them into what practitioners call the six big losses, then removes them one at a time. This article walks through each loss with a shop-floor example and shows how TPM turns scattered firefighting into gains you can measure.

In short: TPM reduces the six big losses, which are breakdowns, setup and adjustment, minor stoppages, reduced speed, process defects and startup losses, by making equipment reliability a shared responsibility. Operators, maintenance and engineering attack each loss at its root, and the improvement shows up directly in Overall Equipment Effectiveness, or OEE.

What are the six big losses in TPM?

The six big losses are the categories TPM uses to classify everything that stops equipment from performing perfectly. They sit under the three factors that make up OEE: availability, performance and quality. In plain terms, a machine either loses time because it is not running when it should be, loses speed because it runs slower than designed, or loses output to bad parts. Mapping each loss to an OEE factor tells you where to look.

Breakdown losses: the obvious thief

Breakdown losses are the unplanned stops that happen when equipment fails outright. They are the easiest loss to see and the most expensive to ignore. Picture a bearing that seizes on a packaging line: the line stops for an hour and a half while someone finds the spare, fits it and restarts. TPM attacks this through its planned and autonomous maintenance pillars. Operators run daily checks that catch a hot or noisy bearing before it fails, and maintenance shifts from fixing failures to preventing them. Tracking mean time between failures, or MTBF, shows whether the equipment is genuinely getting more reliable.

Setup and adjustment losses: the cost of changeover

Setup and adjustment losses are the time lost whenever a machine is switched from one product to another. A filling line that takes forty-five minutes to move between two bottle sizes, much of it spent adjusting guides by trial and error, loses availability on every changeover. TPM pairs well with SMED, short for Single Minute Exchange of Die, which separates work that must happen while the machine is stopped from work that can be prepared in advance. Standard work, pre-staged tooling and clear setting marks turn a guessing game into a repeatable routine.

Minor stoppages and idling: the losses nobody logs

Minor stoppages are the short, repeated halts an operator clears in seconds, so they rarely get recorded. A capping head that jams on a slightly misaligned cap every few minutes is the classic case. No single stop feels worth reporting, yet together they can swallow more capacity than the breakdowns everyone worries about. Because they hide, the first TPM step is to count them. A tally sheet or a sensor log makes the pattern visible, and the team can then fix the root cause, perhaps a worn guide rail or a poka-yoke that stops a misaligned cap reaching the head at all.

Reduced speed losses: running below potential

Reduced speed losses occur when a machine runs slower than the speed it was designed for. These are deceptive, because the line looks like it is working normally. A press rated at sixty strokes a minute might be set to forty-eight because higher speeds once caused jams, and the setting was never revisited. TPM restores equipment to its design condition, so the real constraint can be found and removed rather than hidden behind a permanently lowered speed. Often the fix is a worn part or a contamination source that was never addressed, not the speed itself.

Process defect losses: scrap during steady running

Process defect losses are the defects and rework that happen once a line is running steadily. Weld spatter that needs grinding, short fills that fail a weight check, labels that sit crooked, each consumes material and capacity twice over. TPM treats quality as an output of equipment condition through its quality maintenance pillar, which links specific settings and wear points to specific defects. When operators understand that a particular roller or nozzle drives a particular defect, they keep it in condition instead of inspecting bad parts at the end.

Startup and yield losses: the unstable first run

Startup losses are the off-spec units a process makes before it settles into stable output. An extrusion line that needs the first half hour after a cold start to reach the right temperature and pressure will scrap or downgrade whatever it makes meanwhile. These losses feel unavoidable, which is why they are often accepted without challenge. TPM reduces them by standardising warm-up procedures and keeping equipment in a condition where it reaches stability faster and more predictably. The target is a shorter, more consistent run-up, not a heroic one-off.

How does a TPM consultancy measure the improvement?

A TPM consultancy measures progress mainly through OEE, which multiplies availability, performance and quality into a single figure. Breakdowns and setups pull down availability. Minor stoppages and reduced speed pull down performance. Defects and startup losses pull down quality. Because each big loss maps to one factor, you can see not just that OEE improved but which loss drove the change. Supporting measures such as MTBF, mean time to repair, changeover time and scrap rate give the detail behind the headline.

Conclusion

The six big losses give a plant a shared language for the capacity it already pays for but does not use. TPM does not treat them as six separate problems to solve once. It builds the daily habits, the measurement and the ownership that keep all six in check long after the first improvement project ends. Measure where the losses really sit, fix the root causes, and let OEE tell you whether the gains are holding.

If you want to pinpoint which of the six big losses is costing your plant the most, the team at https://ribcon.com would be glad to help you measure it and plan the fix.

Frequently asked questions

What are the six big losses in simple terms?

They are the six ways equipment wastes capacity: it breaks down, takes too long to change over, keeps stopping briefly, runs too slow, makes defective parts and produces scrap while starting up. TPM sets out to tackle all six.

How are the six big losses linked to OEE?

Each loss belongs to one of the three OEE factors. Breakdowns and setups reduce availability, minor stoppages and reduced speed reduce performance, and defects and startup losses reduce quality. Improving a loss lifts its factor, and so lifts OEE.

Which of the six big losses should we tackle first?

Start where the data points, not where the noise is. Many plants chase visible breakdowns while minor stoppages and reduced speed quietly cost more. A short measurement period usually reveals the real priority.

Do I need a TPM consultancy to reduce these losses?

No, but a good TPM consultancy shortens the journey with structure, measurement and coaching. The pillars and tools work whether you run them in-house or bring in outside help to set the pace.

What is the difference between a breakdown and a minor stoppage?

A breakdown is an unplanned failure that needs a real repair and keeps the machine down for a meaningful spell. A minor stoppage is a brief halt an operator clears without tools, often in under a minute.

How long before TPM reduces the six big losses?

Early wins on minor stoppages and setups can appear within weeks. Durable gains across all six losses build over quarters, as autonomous and planned maintenance habits take hold.