Problem description
- 24′ Raymond was showing impacts in the time waveform consistent to a tooth problem
- Also, in velocity spectrum many side bands of ring gear speed around gear mesh indicating problems with this ring gear
- This separator has had gearing problems 3 times in 2 years
Analysis
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
Findings
- Misalignment of gearing gearbox
- Found several broken teeth on ring gear possibly due to age and excessive wear in lower unit causing misalignment
