ABB OmniCore IRB 6720 Product Manual

7.3 Mechanical noise or dissonanceDescriptionMechanical noise or dissonance that has not been observed before can indicateproblems in bearings, motors, gearboxes, or similar. Be observant of changes overtime.A faulty bearing often emits scraping, grinding, or clicking noises shortly beforefailing.ConsequencesFailing bearings cause the path accuracy to become inconsistent, and in severecases, the joint can seize completely.Possible causesThe symptom can be caused by:• Worn bearings.• Contaminations have entered the bearing grooves.• Loss of lubrication in bearings.• Loose heat sinks, fans, or metal parts.If the noise is emitted from a gearbox, the following can also apply:• Overheating.Recommended actionsThe following actions are recommended:InformationActionCAUTIONAllow hot parts to cool down.1Verify that the service is done according tothe maintenance schedule.2If a bearing is emitting the noise, determinewhich one and make sure that it has suffi-cient lubrication.3If possible, disassemble the joint and meas-ure the clearance.4Bearings inside motors are not to be re-placed individually, but the complete motoris replaced.5Make sure the bearings are fitted correctly.6Tighten the screws if a heat sink, fan, ormetal sheet is loose.7612 Product manual - IRB 67203HAC085697-001 Revision: C© Copyright 2023 ABB. All rights reserved.7 Troubleshooting7.3 Mechanical noise or dissonance