Troubleshoot AC Motors – Part 4

Troubleshoot AC Motors – Part 4

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This is a 4 part series, click to view each part: 1 : 2 : 3 :

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.


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