It is one of the questions maintenance managers ask us most: how often should an industrial robot be serviced? The honest answer is that there is no single number valid for every robot. The frequency depends on how and where each unit works. But there are reference intervals that make a useful starting point and are worth knowing.
What is clear is the order of magnitude of the risk: an unplanned stoppage caused by an avoidable failure almost always costs much more than the maintenance that would have prevented it. Preventive maintenance is not an expense, it is insurance against a line stoppage.
What does the frequency depend on?
Before setting a schedule, take these factors into account:
- Actual operating hours. A robot running one shift is not the same as one running three shifts, seven days a week.
- Load and working speed. A robot near its maximum payload and at high speed wears the gearboxes faster.
- Environment. Dust, high temperatures, humidity, splashes or foundry environments accelerate wear.
- Criticality in the line. If that robot stops the whole production, it pays to be more conservative with the intervals.
- Manufacturer specifications. ABB details this in its TRM (Technical Reference Manual) by family; KUKA and FANUC publish their own intervals by model.
Reference intervals by operating hours
As a guide, this is the scheme we follow on most robot fleets. The exact values vary by model and manufacturer:
| Interval | Main tasks |
|---|---|
| ~1,000 h (or quarterly) | Visual inspection, checking for leaks and noises, cleaning, safety system review. |
| ~5,000 h | Lubrication and greasing of axes, inspection of cables and hoses, backlash check. |
| ~10,000 h | Gearbox oil/grease change, battery replacement, full backup of programs and parameters. |
| ~20,000 h (3–5 years) | Major overhaul: possible gearbox and belt replacement, axis recalibration. |
What a preventive service includes
A well-done preventive intervention is not just "grease and look". It usually covers:
- Axis lubrication and gearbox oil/grease change.
- Replacing position-retention batteries before they run out.
- Calibration or mastering of axes to preserve accuracy.
- Inspection of cabling, connectors and power/data hoses.
- Full backup of programs, parameters and configuration.
- Verification of the safety system and limit switches.
Differences by brand
Although the philosophy is shared, each manufacturer has its specifics:
- ABB: intervals defined in the TRM by family, SMB batteries and fine calibration. More detail in ABB robot maintenance.
- KUKA: mastering with EMD, cable and FSoE safety system review. More detail in KUKA robot maintenance.
- FANUC: pulsecoder and SRAM batteries, controller image backup. More detail in FANUC robot maintenance.
How to plan it without stopping the line
The best maintenance is the one that does not force an extra stoppage. Some keys:
- Use scheduled stoppages (shift changes, holidays, plant shutdowns) for tasks that require stopping the robot.
- Keep an annual plan with the accumulated hours of each robot — do not improvise.
- Rely on a maintenance contract with guaranteed response and reserved critical-part stock, so an incident does not turn into days of downtime.
Frequently asked questions
What happens if I skip preventive maintenance?
The robot may keep running, but the risk of an unplanned failure grows over time: gearbox failures from lack of lubrication, lost programs from drained batteries, or loss of accuracy from miscalibration. An unexpected stoppage usually costs far more than planned maintenance.
How often should the batteries be replaced?
As a general rule, the batteries that retain axis position (SMB on ABB, pulsecoder batteries on FANUC) are replaced every 1 to 3 years or when the low-battery warning appears. Replacing them before they run out avoids losing the mastering and having to recalibrate the robot.
Can I do it myself or do I need a specialised technician?
Visual inspections and cleaning can be done by plant staff. Tasks involving gearboxes, batteries, calibration or safety require a technician with brand knowledge and specific tools, since a mistake can damage the robot or invalidate its accuracy.