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Premature Belt Failure
 Belt Stretches Beyond 
 Banded (Joined) Belt Problems
Bearings Running Too Hot
Sprocket Problems
Belt Noise
Problems With Pulleys
Performance Problems
V Belts Turn Over or Come Off
Unusual Vibration
Problems With Other Drive Parts
Synchronous Belt Problems

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Blue Diamond Belt Problem Wizard - Synchronous Belt Problems

The table below lists the possible causes for premature belt failures. To return to the wizard main menu please click here.

Symptoms Probable Cause Solution
Unusual noise
  1. Misaligned drive
  2. Too low or high tension
  3. Back idler
  4. Worn sprocket
  5. Bent guide flange
  6. Belt speed to high
  7. Incorrect belt profile for sprocket (i.e.HTD, GT, etc.)
  8. Subminimal diameter
  9. Excess load
  1. Correct alignment
  2. Adjust to recommended value
  3. Use inside idler
  4. Replace sprocket
  5. Replace guide flange
  6. Redesign drive
  7. Use proper belt/sprocket combination
  8. Redesign drive using larger diameters
  9. Redesign drive for in
Tension loss
  1. Weak support structure
  2. Excessive sprocket wear
  3. Fixed sprocket wear
  4. Excessive debris
  5. Excessive load
  6. Subminimal diameter
  7. Belt, sprocket or shafts running too hot
  8. Unusual belt degradation
  1. Reinforce structure
  2. Use other sprocket material
  3. Use inside idler for belt adjustment
  4. Remove debris, check guard
  5. Redesign drive for increased capacity
  6. Redesign drive using larger diameters
  7. Check for conductive heat transfer from prime mover
  8. Reduce ambient drive temperature to +85 °c (185 °F) maximum
Excessive belt wear
  1. Damage due to handling
  2. Flange damage
  3. Belt too wide
  4. Belt tension
  5. Rough flange surface finish
  6. Improper tracking
  7. Belt hitting drive guard or brackets
  1. Follow proper handling instructions
  2. Repair or replace sprocket
  3. Use proper width sprocket
  4. Adjust tension to recommended value
  5. Replace or repair flange (to eliminate abrasive surface)
  6. Correct alignment
  7. Remove obstruction or use inside idler
Tensile break
  1. Excessive shock load
  2. Subminimal diameter
  3. Improper belt handling and storage prior to installation
  4. Debris or foreign object in drive
  5. Extreme sprocket run-out
  1. Redesign drive for increased capacity
  2. Redesigned drive using larger diameters
  3. Follow proper handling and storage procedures
  4. Remove object and check guard
  5. Replace sprocket
Belt cracking
  1. Subminimal diameter
  2. Back idler
  3. Extreme low temperature at start-up
  4. Extended exposure to harsh chemicals
  5. Cocked bushing/sprocket assembly
  1. Redesign drive using larger diameter
  2. Use inside idler or increase diameter of back idler
  3. Pre-heat drive environment
  4. Protect drive
  5. Install bushing per instructions
Premature tooth wear
  1. Too low or too high belt tension
  2. Belt running partly off unflanged sprocket
  3. Misaligned drive
  4. Incorrect belt profile for sprocket (i.e HTD, GT, etc)
  5. Worn sprocket
  6. Rough sprocket teeth
  7. Damaged Sprocket
  8. Sprocket not to dimensional specification
  9. Belt hitting drive brackets or other structure
  10. Excessive load
  11. Insufficient hardness of sprocket material
  12. Excessive debris
  13. Cocked bushing/sprocket assembly
  1. Adjust to recommended value
  2. Correct alignment
  3. Correct alignment
  4. Use proper belt/sprocket combination
  5. Replace sprocket
  6. Replace sprocket
  7. Replace sprocket
  8. Replace sprocket
  9. Remove obstruction or use idler
  10. Redesign drive for increased capacity
  11. Use a more wear-resistant sprocket
  12. Remove debris, check guard
  13. Install bushing per instructions
Tooth shear
  1. Excessive shock loads
  2. Less than 6 teeth in mesh
  3. Worn sprocket run-out
  4. Worn sprocket
  5. Back idler
  6. Incorrect belt profile for sprocket (i.e. HTD, GT, etc)
  7. Misaligned drive
  8. Belt undertensioned
  1. Redesign drive for increased capacity
  2. Redesign drive
  3. Replace sprocket
  4. Replace sprocket
  5. Use inside idler
  6. Use proper belt/sprocket combination
  7. Correct alignment
  8. Adjust tension to recommended value
Belt tracking problems
  1. Belt running partly off unflanged sprocket
  2. Centres exceed 8 times small sprocket diameter and both sprockets are flanged
  3. Excessive belt edge wear
  1. Correct alignment
  2. Correct parallel alignment to set belt to track on both sprockets
  3. Correct alignment
Excessive temperature: belt, bearings, housings or shafts, etc
  1. Misaligned drive
  2. Too low or too high belt tension
  3. Incorrect belt edge wear
  1. Correct alignment
  2. Adjust tension to recommended value
  3. Use proper belt/sprocket combination
Shafts out of synchronisation
  1. Design error
  2. Incorrect belt
  1. Use correct sprocket sizes
  2. Use correct belt with correct tooth profile for grooves
Vibration
  1. Incorrect belt profile for sprocket combination (i.e. HTD, GT, etc)
  2. Too low or too high belt tension
  3. Bushing or key loose
  1. Use proper belt/sprocket
  2. Adjust tension to recommended value
  3. Check and reinstall per instructions
Incorrect driveN speeds
  1. Design error
  1. Redesign drive

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