Most likely the motor bearings are sealed and can not be lubricated. If you fins small, one eighth inch holes at the bearing location then try using 2 drops of light oil. If no oil holes, to buy some time you may try and run light weight oil down the shaft into the front bearing. Sometimes it can seep in, depending on the bearing. Spin the shaft as the oil runs down.
If you can remove the motor you may find it less expensive to get new bearings from an electric motor shop. Compare new bearings to the cost of a new motor to be sure it's worth the time and effort.