How to lubricate fan bearings in furnace?
So in our 27-year-old Winnebago Warrior, we have a Suburban NT30KLT furnace. In the last couple of years, the first time it fires up you can hear the fan bearing squalling a bit and then it quiets ...
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There was some rust on the burner assemblies, but not anything in the motor housing that I could see.
I ended up squirting light oil (RemOil) onto the end of the shaft. Since the shaft had a flat spot ground on it for the set screw, the oil could go down the flat spot, through the fan cage, and, hopefully, down to the bearing. I did this for both ends of the motor (both fans).
Put it all back together, and there is no squeal on running now. I don't know how much oil I was able to deliver to the bearing, so I don't know how long the fix will last.
I should have tried setting a socket on the fan cage hub and giving it some light taps after letting the oil soak in.
Steve
I ended up squirting light oil (RemOil) onto the end of the shaft. Since the shaft had a flat spot ground on it for the set screw, the oil could go down the flat spot, through the fan cage, and, hopefully, down to the bearing. I did this for both ends of the motor (both fans).
Put it all back together, and there is no squeal on running now. I don't know how much oil I was able to deliver to the bearing, so I don't know how long the fix will last.
I should have tried setting a socket on the fan cage hub and giving it some light taps after letting the oil soak in.
Steve
