Easiest bearing race install I've ever done
AND NOW another annoying story from the old days. In the 80's I worked in Spokane for a very small HVAC/R outfit. He took in a Dunham-Bush shaft drive 250hp screw compressor that one of the mines had screwed up (no pun, YES!! LOL) They had been having trouble with this chiller staying online, and started bypassing safeties, then bypassed the phase protector.......makes certain the 3 phase is in correct rotation so motor(s) run correct direction.
Then they moved it and.........ran it backwards, damaged the screw. My then boss was pretty smart. As I recall a rebuilt compressor was 25K or more. He figured out how to machine the thrust areas on the screws and thrust plate and save it. We needed some big special bearings which are sold in mached pairs similar to the 75'''ish Dodge full time front bearings.
You are SUPPOSED to use an electromagnetic heater to heat the bearings to install. NAW---he says---go down to Good Will/ St Vincent and find a sandwich oven. OK THEN!!!!
But it turns out there had been a CHANGE in the bearings. These are angular thrust ball bearings. Turns out the ball cages were some sort of composite / plastic instead of metal. They were black, heck they LOOKED like steel Anyhow, 5-600 bucks worth of bearings are junk. Believe it or not, because there was not a warning note in the box of the change, he got them replaced by the bearing company!!!
AND NOW another annoying story from the old days. In the 80's I worked in Spokane for a very small HVAC/R outfit. He took in a Dunham-Bush shaft drive 250hp screw compressor that one of the mines had screwed up (no pun, YES!! LOL) They had been having trouble with this chiller staying online, and started bypassing safeties, then bypassed the phase protector.......makes certain the 3 phase is in correct rotation so motor(s) run correct direction.
Then they moved it and.........ran it backwards, damaged the screw. My then boss was pretty smart. As I recall a rebuilt compressor was 25K or more. He figured out how to machine the thrust areas on the screws and thrust plate and save it. We needed some big special bearings which are sold in mached pairs similar to the 75'''ish Dodge full time front bearings.
You are SUPPOSED to use an electromagnetic heater to heat the bearings to install. NAW---he says---go down to Good Will/ St Vincent and find a sandwich oven. OK THEN!!!!
But it turns out there had been a CHANGE in the bearings. These are angular thrust ball bearings. Turns out the ball cages were some sort of composite / plastic instead of metal. They were black, heck they LOOKED like steel Anyhow, 5-600 bucks worth of bearings are junk. Believe it or not, because there was not a warning note in the box of the change, he got them replaced by the bearing company!!!