That looks like the same unit that I have.
You can't get to the bearings without disassembling the motor and you can't disassemble the motor without removing it from the plenum/squirrel cage.
I did mine 4 years ago and didn't take any pics. I also put new bearings (ok, BUSHINGS!
) in my eng room vent blowers around the same time so my memory re this is VERY shaky. However given that...
IF I remember correctly, the plenum that holds the motor/squirrel cage was attached to the evaporator with two screws on each side of the evap. It is also, of course, attached to the duct hose. After removing the hose for the duct and the 4 screws, and disconnecting the motor's elec wires, the plenum/motor/squirrel cage can be lifted out and put on the table/workbench.
The squirrel cage itself was held onto the motor shaft with a set screw but, of course, was essentially seized onto the shaft. I cannot remember how the motor was actually attached to the plenum and I may be confusing this with some other system or with the vent blowers that I worked on but I seem to recall there were some screws, accessible from inside the plenum, holding the plenum to the motor. But it should be obvious once the plenum is out so you can look at it. I'm sure Steve can immediately supply this info.
After the motor is disconnected from the plenum it cannot be physically removed until the cage is off the shaft. Shoot some penetrating fluid on the shaft/cage joint. Then put some sort of support - a wood or metal "plate" with a long "U" cut in it works well - between the motor and the plenum that will allow you to tap on the motor shaft from the squirrel cage end and drive the motor out of the squirrel cage/plenum. Be sure to use a soft drift so you don't mushroom the shaft. As long as there is good support under the plenum/cage, there is no danger of damaging anything. Rather than a "plate" you can also use two flat pieces of metal (or wood,maybe an inch wide and 12" long as supports. Just put the pieces between the motor/plenum, lay the pieces across your lap, and tap out the motor. I've done that with a bunch of similar assemblies.
Once the motor is out it can be disassembled to access the bearings. I seem to recall that there were two long screws holding the end caps of the motor together but again, it will be apparent upon inspection. The bearings are at each end of the motor.
One thing worth noting is that it may be that all the bearings need is some oil as opposed to being replaced. In fact, both of my noisy blowers ceased being noisy when I put a couple of drops of motor oil on the shaft/bushing. However, since this removal thing is a bit of a PITA and you can't "oil" the bearings without disassembly, I figured I'd rather have new bearings as opposed to worn bearings that needed re-oiling periodically.
I'm sorry I can't remember enough to be more specific and, as I said earlier, some of what I wrote could be in error because of that. But I think it's generally correct and any differences should be obvious upon inspection once the plenum/motor/cage is removed from the evaporator.
Good Luck
