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PROBABLE CAUSE
CORRECTIVE ACTION
Belt Noise (Belt squeals or chirps)
Belt contamination Clean belts and sheaves
Loose belts Check automatic tensioning device
Mismatched set Install matched belt set
Misaligned belts Realign sheaves
Belt Noise (Rubbing sound)
Guard interference Repair or replace guard
Incorrect belts Use correct belt size
Worn sheaves Replace sheaves as necessary
Debris in sheaves Clean sheaves and improve shielding
Belt Noise (Belts flopping)
Incorrect belts Use correct belt size
Mismatched belts Install new matched belt set
Sheave misalignment Align sheaves as necessary
Unusual or Excessive Vibration
Incorrect belts Use correct belt size
Sheave out of round Replace sheaves as necessary
Loose drive components Check machine components and guards, motor mounts, motor pads,
bushings, brackets and framework for stability, proper maintenance and
proper installation
Bent shaft Check and replace motor/vacuum pump
Sheave not flat Replace sheaves as necessary
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