Bathroom Fan Replacement shaft too long


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Old 03-30-24, 01:50 PM
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Bathroom Fan Replacement shaft too long

I bought a Broan DP25 replacement fan motor, assuming my fan was a Broan. It turns out that my fan is a Spartan ADB748. It is mounted with a bracket instead of a click-release base. The Broan BP25 fits in the bracket. The only problem seems to be that the old shaft is 1 1/4" long, but the new shaft is 1 11/16 (about a half inch too long). I would order the correct replacement if I could find it. But another option is to cut off 1/2" and use some epoxy to hold the fan to the shaft, since cutting it off would remove the spline. I did upload an image of the two motors, but I'm not sure I figured out how to attach it here. When I Googled "bathroom fan shaft too long" I did find that others have had this same problem, but I did not find a solution. I would appreciate any suggestions.
Thanks,
Charlie
 
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Old 03-30-24, 02:31 PM
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It's ok to cut the motor shaft. Chamfer the edges with a file so there is no burr.

Unfortunately the blades just slide onto the motor shaft.
The center hub has broken out of your blades.
The should be replaced and are widely available.

An example
 
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Old 03-30-24, 04:09 PM
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The new motor came with a new fan, so it looks like I can cut off the splined end, file the end, and press fit with maybe a little epoxy to keep it from slipping.
Thanks,
Charlie
 
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Old 03-30-24, 04:42 PM
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I had to enlarge the picture to see the splined end.
Very mystifying. I've never seen that on a Nutone or Broan motor.

If your fan blades are splined too and you cut the spline off..... the blades will be hard to push on.
If you can force them on you shouldn't need any additional adhesive.
 
 

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