When it comes to industrial robot maintenance, the same doubt almost always comes up: should you invest in preventive maintenance, or is it enough to repair when something fails? They are two different approaches, not mutually exclusive, and understanding what each covers helps you make the decision that makes most sense for your plant.
What corrective maintenance is
Corrective maintenance is reactive: you act once the robot has already failed. It includes diagnosing the fault, replacing the damaged part and recommissioning. It is essential —no machine is free of the unexpected— but it has a problem: the failure shows up when you least expect it, usually with the line in full production.
What preventive maintenance is
Preventive maintenance is planned: you act before the failure appears, following a schedule based on operating hours and the manufacturer's specifications. It covers lubrication, gearbox oil changes, battery replacement, axis calibration, cable and safety-system checks. The goal is to catch wear before it turns into a breakdown.
The real difference is the cost of downtime
Comparing only the invoice of each intervention leads to the wrong conclusion. The key is the cost of unplanned downtime: a line stopped unexpectedly can cost, per hour, far more than a whole year of preventive maintenance. Preventive doesn't remove the expense, it transforms it: it turns an unexpected, high cost into a planned, predictable one.
| Corrective | Preventive | |
|---|---|---|
| When you act | After the failure | Before the failure |
| Line stoppage | Unplanned | Scheduled |
| Cost | Variable and high | Planned and predictable |
| Part availability | Not guaranteed | Anticipated |
The answer isn't to choose, it's to combine
The efficient approach isn't preventive or corrective, but both well organised: a preventive plan that lowers the probability of failure, and corrective cover with a guaranteed response time and critical-part stock for when the unexpected still happens. That is exactly what a maintenance contract structures.
How we apply it by brand
The approach is shared, but each manufacturer has its intervals and specifics. See the detail on our ABB maintenance, KUKA maintenance and FANUC maintenance pages.
Frequently asked questions
Does corrective replace preventive?
No. Corrective will always exist, but a good preventive plan drastically reduces its frequency and severity. The efficient thing is to combine both.
How much do you save with preventive?
The saving is mainly in avoiding the unplanned stoppage, which is usually the highest cost. Preventive brings predictability to the budget.
What does a maintenance contract include?
Scheduled preventive visits, guaranteed response time, reserved critical-part stock and traceability of each robot.