Timing belts operating on a combination of both flanged and non-flanged timing belt pulleys with parallel misalignment may walk or track partially off of the non-flanged timing belt pulleys. The portion of the timing belt remaining engaged with the non-flanged timing belt pulley will carry the full operating load and may develop a concentrated area of wear after running this way for a period of time. This may ultimately result in premature timing belt failure due to either tensile or tooth fatigue.

Probable Cause:

  • Belt running partly off unflanged timing belt pulley

Corrective Action:

  • Check parallel and angular alignment of the timing belt pulleys

Probable Cause:

  • Misaligned drive

Corrective Action:

  • Check parallel and angular alignment of the timing belt pulleys

Probable Cause:

  • Weak support structure or mounts

Corrective Action:

  • Reinforce structure

Probable Cause:

  • Center to center distance exceeds eight (8) times smaller timing belt pulley diameter

Corrective Action:

  • Check parallel and angular alignment of the timing belt pulleys
  • Redesign drive

Probable Cause:

  • Excessive timing belt edge wear

Corrective Action:

  • Check parallel and angular alignment of the timing belt pulleys
Technical timing belt calculatorcenter to center calculatorpower design
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