It has a flat for a reason

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When tightening down a blower wheel or a fan blade on a motor shaft ONLY tighten it on the flat of the shaft.

If you have more than one screw, but only one flat surface on the shaft then only tighten the one set screw.

Also…

Refrain from overtightening set screws, they need to bite into the shaft but you don’t need to mangle the poor thing. Both setting on the curve and overtightening of these conditions can make it hard or impossible to remove the blade or wheel later. Simple, but important.

— Bryan

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3 comments

  1. Gabe willard says:

    Thanks I will remember that Mex one I do.

  2. John says:

    Pulling the blower on an AC call after I had an 11 degree split temp had me find an underside of evaporator coil completely blanketed. Would be great if you did a podcast or mention on Evaporator coil cleaning and checking basics.

  3. Chris says:

    What is the purpose of the canvas wheel? Is it a dust cover; or is it intended to prevent oil from accumulating on the fan blade?

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