Strobic Air Fan Problem

Gentelmen I would like to start off by wishing every one a Happy New Year. I have a problem with a vertically mounted Strobic Air Fan with the squirell cage directly mounted to the shaft of the motor. A little history of the fan. This is a new building commisioned in April 2008. I did not take the baseline readings for the commisioning. When i was asked to start taking vibration readings I found that the strobic fan in question had two bolts very loose (nuts hat fallen off)the other two bolts, one was loose but the bottom bolt was still very tight. Basically being held by just one bolt. All the shims had fallen off the feet of the motor on the loose bolts. The manufactorer or the people who was contracted to install the fan were recalled to place the shims back. They have found that due to the location of the fan and the very tight opening it is very difficult to replace all the shims back to the bolts. The vibration readings that I am seeing is a High one times turning speed in the vertical direction on both bearings, higher on the top bearing. Nothing in the horizontal plane but higher than normal axial reading. Normally this data would tell me that we were out of alignment. But due to the fans configuration I'm not sure what is happening. Also the time waveform is sinusodial. If someone could help me I would appreciate it

Mario

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