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Faults of pulleys
  • wear of pulley rim;
  • damage to the surface of the grooves;
  • disbalance of pulleys;
  • pulleys bearings wear;
  • lock of belt movement;
  • cracks and changes in the form of pulleys;
  • wear and damage to the bore and key seat.
Symptoms of pulleys failure
  • strange noise during the engine operation;
  • overheating of the engine at idling;
  • frequent damage to the belt;
  • dips in the power stroke of the engine.
Causes of pulleys faults
  • wrong location and fixing of pulleys;
  • improper installation of the belt;
  • improper belt tension;
  • wrong choice of pulley diameters;
  • ingress of foreign objects in the system;
  • too high belt speed (higher than 20 m/s);
  • different degree of the main and driven pulleys wear;
  • failure to comply with the operation rules;
  • use of substandard materials and spare parts.

Assessing the condition of pulleys is easy. Working pulleys must be free of visible damage and have clear and smooth grooves. Pulleys must be sufficiently lubricated and rotate freely. Check the wear and tear of the pulley grooves. If the belt fully falls in them, the parts urgently need to be replaced. Diagnosis of the belt system is recommended to do every 1000 kilometers.

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