Bearing wear on the motor (as distinct from airend bearings) causing noise, heat, or eventual seizure.
1
Lubrication interval exceeded or wrong grease used
CheckReview PM records for last grease service and grease type/quantity against OEM spec.
FixRe-grease per OEM interval/quantity with the specified grease type — do not over-grease.
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2
Bearing currents from VFD operation (shaft voltage/EDM pitting)
Rotary screw
CheckCheck for an insulated bearing or shaft grounding ring on VFD-fed motors; look for fluting marks on bearing races if removed.
FixInstall shaft grounding ring or insulated bearing per motor/VFD manufacturer guidance.
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3
Belt over-tensioned, overloading motor bearings
CheckCheck belt tension against OEM spec (deflection method or tension gauge).
FixRe-tension to spec, not simply as tight as possible.
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4
Contamination or moisture ingress into bearing
CheckInspect grease condition for water/dirt contamination upon removal.
FixReplace bearing and seals; address contamination source (washdown, humidity, seal failure).
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5
Normal end-of-life wear
CheckCompare bearing running hours to typical L10 life expectations for the application; vibration analysis trend.
FixReplace bearings proactively per vibration/thermal trend rather than waiting for failure.
ToolsVibration meter · IR thermometer
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.