Trouble-Shooters Guide for V-Belt

Trouble-Shooters Guide for V-Belt

Here is a guide to the most common symptoms which cause belt failures and how to troubleshoot them.









Belts stretch unequally.   

Misaligned drive.

Re-align and retension drive.

Belt tensile member broken from improper intallation.

Replace all belts with new match free set, properly installed. 
All belts stretch about equally.   

Insufficient takeup allowance.

Check takeup and follow alliance as per standard.

Greatly overloaded or underdesigned drive.




Relatively rapid failure; no visible reason.


Tensile members damaged through improper installation.

Replace all belts with new match free set, properly installed.

Underdesigned drive.


Worn pulley grooves (Check with groove gauge).

Replace pulleys.

Sidewalls soft and sticky. Low adhesion between cover piles. Cross section swolen.


Oil or greese on belt or pulleys.


Remove source of with non -flammable,oil or grease. Clean belts and grooves with Cloth moistened non-toxic degreasing agent or commercial detergent and water.


Side walls dry and hard. Low adhesion between cover plies. Bottom of belt cracked.

High temperature. Remove source of heat. Veltilate drive in better way.
Deterioration of rubber compounds used in belt. Belt dressing.  

Never use dressing on V-belts.


Clean belts and grooves with cloth moistened with non-flammable, non-toxic degreasing agent or commercial detergent and water.


Tension drive properly.

Excessive cover wear.  

Belts rub against belts guard or other obstruction.

Remove obstruction or align drive to give needed clearance.
Spin burns on belt.  

Belts start under starting or stalling or stalling load.

Tighten drives untill slipping stops.
Cuts and spilts in the base of the belts.(Brittleness)  

Too small pulleys.

Redesign for larger pulleys.

Excessive heat, ambient temperature above +70°C/158°F 


Remove or baffle heat source improve ventilation.

  Abnormal belt slip. Tension drive as per istallation instruction. Check drive design and redesign if necessary.
Broken belts. Object falling into or hitting drive. Replace with new match free belts. Provide guard for drive.
Belt turnover.  

Excess lateral belt whip.


Foreign material in grooves.


Misaligned pulleys.


Worn pulley tensile member broken.


Incorrectly placed flat idler.


Replace the belt.


Remove material shield drive.


Realign the drive.


Replace pulley.


Replace with match free carefully align flat idler on.


Belt Slip. 

Re-tension drive until it stops slipping.
Incorrect driver driven ratio.  

Design Error.

Use correct pulley sizes stop slipping.
Drive over tensioned.   

Worn groove belts bottoming and will not transmit power until overtensioned.

Replace pulleys. Tension drive properly.

Improper tensioning.

Re-tension drive.
Pulleys too small.  

Motor manufacturer's pulleys diameters not followed.

Re-design drive.
Poor bearing condition.  

Undesigned bearings or poor bearing maintenence.

Observe recommended bearing design and maintenence.
Pulleys out too far on shaft.  

Error or obstruction problem.

Place pulleys as close to bearings. Remove any obstruction preventing this.
Drive under tensioned.  

Belts slipping and causing heat bulitup.

Retension drive


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