You report a problem with your equipment, call in the service technician, and then wait for the report, whether verbal, or written, on the condition.  Ideally, when the service technician evaluates the condition of your equipment, whether at your place or his shop, a preliminary report of the condition is mandatory, preferably before he leaves.  The evaluation is only as good as the training and experience of the technician.  It also depends on the quality of the test equipment being utilized. Although type of equipment being evaluated may require specialized test equipment, vibration analysis is pretty much universal for all rotating equipment. And evaluating the vibration data is only as good as the training background of the technician/analyst. 

Vibration analysis can identify rotor imbalance, worn bearings, misalignment, loose v-belts, defective couplings, and a myriad of overall installation problems involving looseness, resonance, broken gears, etc...  The final report should detail not only the cause, but recommend a solution to any problem.  Vibration spectrums & graphs should be in easy to read format that can be understood by the layman reading the report.  Trending reports of the overall vibration amplitudes and bearing condition values is usually the easiest to understand.  Too many vibration spectrums, or pages, can be counterintuitive.

What many technicians fail to do is a complete evaluation.  To report the 'coupling has failed' is not enough. Have any of the bearings in the motor, blower, or pump been damaged?  More than one repair shop that I've dealt with insists "Oh, we don't work on motors", or "we don't work on blowers, or pumps".  When a failure of any kind happens in rotating equipment, the entire drive chain must be inspected/evaluated for damage.  It is difficult to find someone who can truly do a complete evaluation. 

At STS we pride ourselves on analyzing vibration data collected from centrifugal blowers and their drive motors. With our formal classroom training and over 40 years of combined analysis experience, we can complete an evaluation of any rotating equipment and provide a written report that leaves no doubt to the actual condition of your machines.  Using infra-red temp monitoring, laser shaft alignment of direct, or belt, driven machines, motor electrical testing, and fan/rotor balancing, we evaluate, and propose solutions, to the complete drive train.   

To that end, we strongly recommend regular monitoring of your equipment to help prevent the unexpected failure.  Invest in PM, it can save you money.