Working on one of the very few v-belt driven Ingersoll Rand SSR compressors I cover, My data collector first showed me about 8 ips as an overall on the input shaft bearing of the compressor. I figured that I had broken a cable or had an accel go bad and took it again-9 ips. Once more and over 13 ips. Last month was .425 ips. Looking at the input shaft I can see something moving axially when the compressor loads and unloads. I think it may have been the inner bearing race that I was looking at.
The maintenance manager doesn't seem too alarmed about the situation and didn't think much of my prediction that it might not make it through the day. This compressor has a history of high vibration at running speed which is probably due to resonance in the flimsy frame which is not bolted to the floor. It has been like this for years and they expect it to continue for years more. I gave him the number of the closest compressor rental place just in case