Oil or Grease on a Robot: What a Service Record Should Include

Seeing oil or grease on a robot does not automatically identify a failed seal, and it should not be dismissed without considering the equipment and its history. A service report should identify the material's apparent location, the machine and the circumstances in which it was observed. A qualified provider can then assess the condition against the manufacturer's instructions for that specific model.

Record the observation before describing a cause

Note the robot model and serial number, the area where material was seen, the date and time, and whether it appeared suddenly or had been observed before. A photograph with a scale and a description of the surrounding equipment can help the service provider understand the observation. Avoid labelling the substance or the failure mechanism as certain unless it has been identified by a competent person.

If the observation creates an immediate hazard or affects the work area, follow the site's procedures and escalate it. Do not continue an unsafe operation merely to see whether more material appears. Record what was observed before any authorized cleaning or service action, provided doing so is safe.

Use the manual for the actual robot

The Universal Robots e-Series service handbook states that a very small amount of grease can be visible from a joint in rare cases and describes handling precautions. That statement applies to the manufacturer's equipment and the described condition. It does not establish that a large quantity, a different substance or a similar appearance on another robot is acceptable.

Give the service provider the exact model, software or hardware revision where relevant, and the manual or service documentation used by the site. If the equipment has been repaired or modified, include those details. A general online comment about one model is not a substitute for an assessment of the actual machine.

Keep maintenance history and operating context

Ask when the affected component was last inspected or serviced and whether lubricant, seals or other parts were replaced. Record any recent relocation, collision, storage period or change in the operating environment. These facts can help frame the investigation, but timing alone does not prove that a particular event caused the observation.

Note the task being performed and whether the robot was operating, idle or undergoing maintenance when the material was noticed. If different shifts observed the condition, retain their notes separately with dates. Do not ask workers to repeat a potentially unsafe operation simply to create more evidence.

If a maintenance team has an earlier photograph of the same area, attach it with its original date and identify whether cleaning or repair occurred between the two observations. An image can show a visible change but cannot determine how much material escaped or where it originated. The service provider should evaluate it alongside the equipment history and inspection findings.

Consider the surrounding application

A robot can operate close to a process that uses its own oil, coolant or other materials. The service team may need to distinguish material from the robot from material originating elsewhere in the cell. Record nearby equipment and any known process materials, while leaving identification and diagnosis to qualified personnel.

Where the workpiece or workplace has cleanliness requirements, the owner should assess the effect of the observation under its own quality and safety procedures. A manufacturer's note about a joint does not automatically answer a customer's product-contamination question.

Plan inspection and handling safely

Lubricants and cleaning agents can have health and environmental precautions. The cited service handbook includes guidance on protective equipment and handling. Follow the safety data sheet and site procedures for the actual substance, and use trained personnel. Do not open a joint, add lubricant or remove covers based on a general article.

FANUC America's robot wrist repair page describes an evaluation and repair service for its equipment. It illustrates that a provider may need to inspect the relevant assembly before proposing work. Its service description is not a diagnosis or a repair recommendation for a different robot.

Close the case with evidence

Record what the service provider inspected, any identified substance or component, the action taken and the conditions of any follow-up check. If the cause remains unknown, say so and agree who will monitor the condition and when to seek further service. A cleaned surface alone does not show whether the original condition has been resolved.

For a different end-of-arm service issue, see our vacuum gripper observation guide and browse the robot service archive. A precise observation and the correct model documentation give the service team a better starting point than an assumed diagnosis.