Instead pick up electric motor oil like 3 in one electric motor oil about 3 at amazon.
Lubricant for fan motor.
Then put in a few drops of number thirty oil on both ends of the aforementioned shaft sticking out of the motor.
Plus it contains detergent.
Step 3 apply a light nondetergent household oil that is sae20.
Afterwards you can oil the fan.
Apparently wd 40 was the wrong oil to use.
Fan maintenance it s important in this throwaway society to realize the value of maintenance.
It s too thin for electric motors.
Step 2 lay the fan down on a flat surface with the exposed face up.
This lubricant oil is produced by liberty oil products and it is a 100 synthetic oil compound.
Grasp the blades firmly and lift slowly to remove them.
Lubricate a box fan motor step 1 remove the front grill of the fan.
The furnace blower motor is going to be working in very hot conditions so the type of lubricant you use is important.
Then swivel the shaft and cleanup any excess oil.
Never put wd 40 in any electric motor even if the rotor is stuck from filthy dried up lubricant.
It is now so far removed from the way most americans think it.
Add no more than 1 to 2 drops at each oil port.
Whenever you have to lubricate an electric pump bench grinder or other electric motor don t pull just any oil off the shelf.
It is excellent for smaller electric fan motors because it helps to reduce friction when there is a moving surface.
Don t use automotive motor oil.
Then remove the fan s blade and wash it with soap.
It not only removes any remaining lube but it can melt coil wires the lightly coated copper wires twisted up in electric motors and cause an electrical short.
If there is a c clip pry it off first.