Is that a bearing pressed into some kind of carrier? How much slack is in those bearings... Sometimes, old dried grease will make bearings sound rough... Put a bit of oil in the bearings and turn them... I have done that before to soften the old dried grease and they smooth out.. Best to change them though if you can... Get some good electric motor cleaner and clean the windings.. Sprayon use to sell a good cleaner for just such a purpose.. After dry, coat the windings with Glyptol.... Any time you see a grease fitting on an old electric motor, you can pretty well bet the guts are full of old grease....If this grease gets into the windings, it causes temperature rise and motor failure lots of times....; Many good motors have been ruined in just such a manner...Cheers; Ramsay 1
Yes that looks like the stuff I use to use... It should clean without damaging insulation.. They also make an insulation too I think. 3M made some but it was terribly expensive...
The motor is so saturated with oil and grease now. I might use kerosene or mineral spirits for bulk cleaning. Use the spray electrical cleaners after that as a final clean up.
Those sprays are sort of like brake cleaner when in the air, feels like it sucks the oxygen from you. Recommend taking a drip pan, cardboard etc outdoors and spray that outside. Not stuff you want breathe or have lingering in the shop air.
OK. I wasn't sure how K-1 or mineral spirits would affect the insulation on the windings. I have a couple sure shot sprayers I think I will use with both of those chemicals and just hit it until the bulk of it comes off. A lot cheaper than any of that spray, that's for sure.
I called a few motor shops today. All I was looking for was someone that would bake out the remainder of the grease, varnish the windings, and test the coils. If the cost was low enough, I'd consider doing it.
One wouldn't take the job at all.
Second one said I should just clean it as best with a citrus based solvent like Zepp I can and run it since it was running before.
Third said the same thing but suggested if I wanted it cleaner, to put it in the back of my pickup and take it through a car wash! LOL!
I think I'll try a little Zepp. Get it as clean as I can until the bearings show up, then let it dry out and send it.
For those that know, if I wanted to replace these bearings with a sealed bearing, would that be possible? One that wouldn't need greased?