Are the GE HC39GE242A and the GE HC39GE242 electric motors interchangeable?

SOURCE: I thought the blower motor

It could be a bad thermostat. remove the front cover, take a jumper wire from r to g to see if the fan will come on, if does then its the thermostat is bad, if don't, then the fan circuit board is bad.

SOURCE: AC condensor fan motor replacement

one wire goes to the coil one to the capacitor and one line

SOURCE: replaced a one speed 230volt 1 phase electric

Look at the old motor and see what the rated rpm was. Next look at the new motor and see if it gives a speed for each wire. If it doesn't give the speed for each wire then look at the rated motor speed. That will be the Hi speed. Hook up the wire that matches the speed of the old motor and cap the other.

SOURCE: Rheem condensing unit fan motor

Could be the fan blade is the issue for vibration. Perhaps the blade was bent or somewhat damaged during failures or during the fan motor replacement process.

Might try replacing the blade. Be sure to install the correct blade. Pitch, number of blades as was on the original unit. If blade was replaced previously, the new blade may be pitched or sized incorrectly.