Molly Brown wrote:
Any centrifugal fan that is secured to the fan motor shaft with only
one bolt will eventually become loose and begin to hit the fan cage.
This is especially so for fans that are heavy and operated
horizontally. A fan that is hitting its cage will cause the
temperature cut-out to trip and will eventually burn-out. These types
of fans are usually found in furnaces. It may be possible to avoid
this by drilling and tapping a second hole perpendicular to the first
one on the fan for another bolt to better secure it to the motor shaft
or check to make sure your fan is not secured by only one bolt before
buying it.
Gmm,
Never happened to me. Use some locktite for the bolt thread.