Originally Posted by DancinCampers
I have a Coleman 4900 series heatpump and changing out the motor got rid of the high pitched bearing noise. The motor has sealed bearings. I have replacement bearings but have not found a shop yet to press them on. I tried to remove the metal seal on the bearings but could not without damaging them. I hope to have the bearings pressed on so I can replace in the front unit.
My motor is mounted vertically, and there is a foam seal required where the shaft goes into the mounting plate. These are cheap from AirXcel but shipping is not, so I included a condensate pump in the order.
I got my replacement motor on Amazon, which did not come with the seal.
To be sure I took a look at the motor used in the 49000 Series of HP units by Carrier/AirXcel - it’s rare to see a FHP motor of this type to be built with ball bearings. May be because it’s mounted vertically, but that’s hard on ball bearings (weight of the rotor plus the evaporator blower wheel and both the weight and thrust load of the condenser fan).
Quite often it’s advertised on motors such as these “sealed for life” bearings, and the bearings are sleeve bearings. They’re lubed for life because oil ports were not included in the end bells. They can be lubricated following the instructions given above.
Or, by placing the motor on end, cleaning the shaft as it enters the end bell, and saturating the gap between the shaft and end bell with machine oil. Once it will take no more oil, flip the motor over end for end, and do the same to the other shaft.
If of course this motor truly has ball bearings and they are already squealing, then lubrication being added in the above ways is a short term solution.
If you have ball bearings and get the motor apart, you can use a Dremel tool to cut the old bearings off. Clean the bearing race surfaces up of any dirt or Dremel shavings and put the rotor in either freezer or refrigerator, put the new bearing in a warmed place of not more than 150-160 degrees or so for about 10 minutes (you don’t want to cook the grease out of the bearing).
When ready, remove the rotor from the cooler and the bearing from the warm place - it should easily slide onto the rotor. It may require a few easy taps with a hammer using a piece of pipe to slide over the shaft to apply for pace against the inner shaft of the bearing.