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Misalignment of a gearbox 2017-11-07T08:26:19+00:00

Project Description

Misalignment of a gearbox

Problem description

  •  24′ Raymond was showing impacts in the time waveform consistent to a tooth problem
  • Also, in velocity spectrum many sidebands of ring gear speed around gear mesh indicating problems with this ring gear
  • This separator has had gearing problems 3 times in the last 2 years


Time waveform indicating fault

  • Single impacting at once per revolution and then there were other impacts showing multiple tooth problems

Time waveform trend views

  • Major step change indicates first tooth problem
  • Trends over 6 (upper) and 7 (lower) month

Vibration Signature

  • Increasing Time Waveform energy with once per revolution impacting and many gear mesh sideband frequencies of Ring Gear speed


  • Misalignment of gearing gearbox
  • Found several broken teeth on ring gear possibly due to age and excessive wear in lower unit causing misalignment

Result: Ring gear failure