7.2 Oil and grease stains on motors and gearboxesDescriptionThe area surrounding the motor or gearbox shows signs of oil leaks. This can beat the base, closest to the mating surface, or at the furthest end of the motor at theresolver.ConsequencesBesides the dirty appearance, in most cases there are no serious consequencesif the leaked amount of oil is very small.Possible causesThe symptom can be caused by:• Leakage of rust preventives or mounting grease. This should be wiped off.• Leaking sealing between gearbox and motor.• Gearbox overfilled with oil.• Gearbox oil too hot.Recommended actionsThe following actions are recommended:InformationActionCAUTIONAllow hot parts to cool down.1If the oil spill is small, this step issufficient.Wipe off the oil or grease, see Cleaning the IRB6740 on page 172.2Monitor the robot over time to see if new oil orgrease occurs.Check the gearbox oil level.3Robots performing certain, ex-tremely heavy duty work cyclesmay be fitted with vented oil plugs.These are not fitted to normal dutyrobots, but can be purchased fromyour local ABB representative.Too hot gearbox oil may be caused by:• Incorrect oil quality or level.• The robot work cycle runs a specific axistoo hard. Investigate whether it is possibleto program small "cooling periods" into theapplication.• Overpressure created inside gearbox.4Inspect all sealings and gaskets between motorand gearbox. Replace broken parts.5Product manual - IRB 6740 6353HAC085701-001 Revision: A© Copyright 2023 ABB. All rights reserved.7 Troubleshooting7.2 Oil and grease stains on motors and gearboxes