we are facing a high vibration in 1X for seal oil pump. this pump has DE & NDE 6310Z, P= 22 KW
On the FFT, the horizontal 1X vibration is dominant and represents about 90% of the global value. We notice that the amplitude on the NDE side in a radial direction is more than twice the amplitude on the same side but at 90° angle.
- On the velocity waveform, we observe a purely sinusoidal curve with high amplitude.
- Presence of the inner race ( BPFI ) and outer race ( BPFO ) fault frequencies of the motor bearings, these measurements are detected at high frequencies and (Demodulation technique) but it's lower amplitude.
We have done a 4 stroke greasing but nothing changes ( we added 6grm each side)
We did an impact test for a similar pump and found that it equals around 56Hz which is close to the rotation frequency of the motor.
I'm not sure but I thought that the outer race was spinning in its housing.
A bearing failure excited by the natural frequency can cause a high vibration.
really we need your expertise in order to resolve or identify what's happing exactly.
Thanks in advance