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You will find in this section the causes and remedies to the main problems related to Poly-V belts: broken ribs, separation of the rib compound, loose resistant insert, reduced rib section, deposit of external material in the belt grooves.

Broken ribs

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Causes:
  • Progression of cracks
  • Presence of foreign matter in the pulley groove
  • Incorrect assembly, ribs outside the pulley
  • Misalignment, ribs untracking
Actions:
  • Check the correct installation of the belt, the absence of foreign matter in the pulley grooves and the correct operation of all the transmission components
  • Replace the damaged belt

Separation of the rib compound

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Causes:
  • Use of unsuitable tools for the belt installation on the pulleys
  • Misalignment between the transmission components
  • Incorrect positioning of the belt on the pulleys
Actions:
  • During assembly, carefully check the belt positioning in the transmission and make sure the transmission rigid components are correctly secured and aligned
  • Replace the damaged belt

Loose resistant insert

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Causes:
  • Excessive working tension
  • Irregularities in the pulleys that may cause abrasions or cuts to the belt
  • Faulty pulleys
  • Misaligned pulleys
  • Interference with a fixed component
Actions:
  • Make sure the transmission rigid components are in good condition and are correctly operating and aligned, and that the belt is correctly tensioned
  • Replace the damaged belt

Reduced rib section

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Causes:
  • Low assembly tension
  • Excessively worn pulley grooves
  • Incorrect choice of belt for the application (excessive length)
Actions:
  • Make sure the belt is suitable for the application
  • Make sure the transmission rigid components do not show obvious signs of wear and that the belt tension is that prescribed by the manufacturer
  • Replace the damaged belt

Deposit of external material in the belt grooves

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Causes:
  • Material detached from the ribs and deposited at the bottom of the grooves
  • Penetration of foreign material between the belt and the pulley groove causing vibrations or excessive noise
Actions:
  • Make sure the transmission rigid components do not show obvious signs of wear and that the belt tension is that prescribed by the manufacturer
  • Inspect the transmission components and make sure there is no material deposited in the pulley grooves: dirt or grit – that may compromise their correct operation
  • Replace the damaged belt