V - belts problems & solutions

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Good Evening Everyone....!!!

Today we shall discuss some general problems of  V- belts & their solutions. Common v-belt drive problems can be diagnosed rather quickly and generally fall into one of the following categories.


 • Improper installation / tension
• Improper maintenance
• Drive contaminants /drive environment
• Inferior drive selection/design

Improper Installation / Tension

The most common v-belt drive problems relating to installation are improper drive alignment and insufficient tension.

 Problems related to insufficient tension will include:

• Rapid sidewall wear on belt (often even wear on both sides)
• Belt turns or jumps off of the sheave
• Belt slips and squeals
• Belt appears glazed and hardened due to spin burn.

Problems related to alignment will include:

 • Rapid sidewall wear on belt (often uneven wear on one side)
• Vibration
• Uneven wear on sheave groove walls

Common Reasons for Drives Being Undertensioned

  • Belts were installed with no physical measurement of tension.
  • Belts were not retensioned after belts seated themselves into sheave groove (typically 24 hrs. after installation).
  • Original belts were cut off and replacements were pryed or rolled onto the sheaves assuming tension was adequate.

  •  Improper Maintenance:

The most commonly overlooked maintenance procedures causing drive performance issues include.
• Worn or damages sheaves (Worn sheaves allow the belt to ride lower in the groove. As a result, the belt experiences increased stress at the cord line, slips, and often fails prematurely.In addition, drive efficiency loss can be significant. Sheaves with 1/32” or greater wear need replaced).
•  Ensuring sheave alignment (symptoms stated previously)
• Ensuring sufficient tension (symptoms stated previously)
• Prying belts on sheaves should be avoided (Prying belts on the sheaves can rupture the loadcarrying 
cords leading to premature failure)

  • Drive Contaminants:
To maximize drive life , always look for and correct the following:

 • Excessive oil or grease on the drive (Clean and install guarding)
• Abrasive environmental conditions (Clean and install guarding)
• Belt Dressing (Belt dressing treats a symptom not the disease. Belt squealing is caused by
insufficient tension and / or worn sheaves)

  • Inferior Design:
To maximize drive life , always look for and correct the following:

A drive that has sufficient installation and maintenance performed regularly and still fails to adequately perform may be underdesigned or the quality of the drive components may be a factor.
  • A quick verification of adequate drive components & selects the most optimal drive and even gives you appropriate tension requirements for the belt.







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