A friend asked help about his furnace blower emitting a screeching sound during operation and then just stopped. I went over and tried to rotate the blower by hand - resistance to free rotation was present. Removed the blower assembly and dismantled motor. No lubrication on both motor bushings. Cleaned and lubricated bushings and re-assembled motor and fan. Now it rotates freely. Tried to start the furnace - burner started to fire but the motor just hums till the burner went out. Rotated the blower - free! The motor is capacitor started - could not locate any nameplate for both the motor and furnace. What might be the problem? It is getting colder. Please help!