Troubleshoot AC Motors

from reliance.com
Posted -3-29-04

Problem D - Motor bearings run hot or noisy

D1: Check loading. Is excessive side pressure, end loading or vibration overloading bearings?		Reduce overloading.* Install larger motor.
D2: Is sleeve bearing motor mounted on a slant causing end thrust?		Mount horizontally* or install ball bearing motor.
D3: Is bent or misaligned shaft overloading bearings?		Replace bent shaft or align shaft.*
D4: Is loose or damaged end bell overloading shaft?		Tighten or replace end bell.*
D5: Are bearings dry?		Lubricate.*
D6: Is bearing lubricant dirty, contaminated or of wrong grade?		Clean bearings and lubricate with proper grade*
D7: Remove end bells. Are bearings misaligned, worn or damaged?		Replace.
*Bearings may have been damaged. If motor still runs noisy or hot, replace bearings.