Troubleshoot AC Motors – Part 4
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This is a 4 part series, click to view each part: 1 : 2 : 3 : 4
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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