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Check for power getting to the affected motor. If power is reaching motor but it does not spin you might also want to check it for excessive friction in bearings caused by dirt/wear . Motor might have also burnt out its windings if it was spinning too slow and excessive current heated and melted the windings.
Buday, it sounds like the blower fan and motor needs cleaning and oiling. This should be done annually and you can do it yourself. This should quite things down a bit.
According to your Owners Manual, here's what you need to do.
Servicing and Oiling the Fan Motor: The fan motor should be cleaned and oiled once each heating season. To reach the motor, withdraw the metal shroud surrounding the fan blade by removing the screws on each side. Oil holes are located on the top at each end of the motor. Use a few drops of #10 motor oil. To clean the motor, blow air through its ventilation openings with a vacuum cleaner or low pressure air source (canned air with a straw nozzle like you clean your computer with works well).
'Oil Ports' are a thing of the past. Mfc's quit putting them on motors several years ago - mainly - so they could sell more motors - don't you know.
However, sometimes you can still "oil the bearings."
A trick I've done (with some success) is to take an electric drill and drill a hole on the hub (if possible) and squirt oil down the hole (on top of the bearing) and see if it will free up the motor. It's worth a try and like I mentioned (above) it's worked for me before.
Depending on the age of the unit/Fan there may or may not be oil ports, at the end of the motor, (Little plastic pull out's) Would use mechanical oil 3n1 ect.
Also The capasitor usually goes bad over time, which can be purchased at a local Hvac supplier usually less then $20.
If the Motor will not turn freely, several turns with just hand spining then more then likely you need to replaice the motor. Let us know how it goes. Can follow up with additional simple test for you if you need.
Shut the power off to the unit, spin the fan blade to see if it spins freely. If it doesn't spin freely, (there appears to be a little drag when you spin it),the bearings are bad, if it does spin freely, then try moving the motor shaft from side to side if there’s any play in the shaft side to side then the bearings are worn and motor needs replaced. Then, check the capacitor, if it’s bulging even slightly, the capacitor is bad and needs replaced. Most of the time people replace the capacitor if motor seems ok. If capacitor is ok, turn power on to see if the motor is getting the proper voltage, if it is and not trying to run, then the windings are probably open, the motor's bad and needs replaced.
Its clogged. It needs to have a thorough clean out and this can be done by removing the sole plate / floor head where the beater bar is and checking to see that all the air ways or the dust channel that flows through t he main spine neck at the back is clear, checking the main spine at the back is clear and finally to check that there is no clogging at the top of the back spine as well. Oreck XL can become clogged quite quickly due to its relatively small suction tube openings and small motor.