Problem: the motor binds after replacing the rotor
Solution: Oversized Rotor or improper rotor gap
If the fan is hard to turn when the motor end cover is installed, but easy to turn
when loosened, the rotor should be removed and lightly sanded. Remove the
rotor and lightly sand by placing rotor in the palm of hand and sanding on a flat
surface making figure eight rotations. (Use the finest grade of sandpaper available).
this text taken from Desa's Tech Tips
|Set the Rotor Gap:
Hint: a small piece of paper the correct thickness works great to measure the gap!