Unpleasant noises from V-belts (such as squeaking, whistling, rubbing, or screeching) are usually signs of an underlying problem and should not be ignored. The common causes and their solutions are as follows:
- Incorrect Belt Tension: A belt that is too loose causes slippage, friction, and squeaking, while an overly tight belt leads to excessive stress on the belt and bearings. Proper tension eliminates noise and extends the belt’s lifespan.
- Pulley Misalignment Issues: When pulleys are not parallel to each other, the belt edges experience wear and friction noise. Proper alignment can be achieved using laser alignment tools.
- Belt Wear or Damage: Cracks, hardening, material loss, or surface wear on the belt can cause noise. In such cases, the belt should be replaced with a new one.
- Contamination or Damage on Pulley Surfaces: Oil, dirt, or rust accumulated in the pulley grooves prevents proper belt grip and causes noise. Cleaning the pulley surfaces or replacing damaged pulleys may be necessary.
- Incorrect Belt Type or Size: A belt with an unsuitable profile or length for the application can also generate noise.
The type of noise helps determine the correct diagnosis and appropriate solution. Such sounds may be early indicators of a major malfunction or system damage; therefore, prompt intervention is essential.