Motor Bearings & Environment
Drive Arrangement Tension, Wear, and Cleanliness
Make sure that the belt tension is still tight enough but not too tight. Check to see if there’s any dirt build-up in the belts and clean as necessary. Look for wear on the belts and replace them before they snap.
Fan Wheel and Shaft Wear, Corrosion, and Material Build-Up
Inspect the fan wheel and the shaft for wear, corrosion, or material build-up.
Other Metallic Component Corrosion or Cracking
Check for corrosion and cracks in all other metallic components, including the pedestal, housing, inlet box, etc.
Check all of your fasteners for tightness.
Shaft Seal Wear
Check the shaft seals and replace them if worn.
Vibration Monitoring and Control
Temperature Monitoring and Control
Is the unit clean and free of dirt and debris build-up?
Source: Atlas Machine & Supply (Community Member)