Master B-150D 150,000BTU Kerosene Heater - full fuel tank - FOR REPAIR

Master B-150D 150,000BTU Kerosene Torpedo Forced Air Heater FOR PARTS OR REPAIR. Unit will fire, but after running for several seconds the fan motor will slow down and stop and begin to hum. I tried replacing the motor capacitor but that did not resolve the issue. I believe the motor is faulty, and I don'...