My question is there any test to check a defective shock abosorber (spring unit) installed below an overhung fan to check is it properly working or not?
i have a centrifugal overhung fan with high vertical vibration at 1XTS and when i raise the fan frame with shaft at any shock absorber the vibration decrease at some points and another points increase.
i checked the alignment ,bearing clearances,the impeller
and what the phase behaviour between horizontal and vertical at overhung fan bearings.
ready for any clarification.