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I have a typical small electric induction motor given to me in pieces. It has two wave washers which I am told should sit between the bearing and the assembly.

I am not sure which bearing needs the wave washers.

  1. Do I place on one wave washer before the front and rear bearings ?
  2. Both wave washers on the rear bearing?
  3. Both wave washers on the front bearing?

Please advise.

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  • $\begingroup$ Update: After placing both wave washers at one side of the shaft I could hear the shaft grinding in the back plate. Definitely not what it is meant to do. Thanks for the feedback guys. $\endgroup$
    – TheLegendaryCopyCoder
    Jul 11, 2018 at 9:59

3 Answers 3

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I would assume one wave washer for each bearing - this allows pre-load to limit any play and expansion control as it get hot in normal operation.

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  • $\begingroup$ This is not universal. I just took apart a 1990s 5HP motor which had 2 wave washers stacked together at one end only. $\endgroup$
    – StayOnTarget
    Sep 7, 2021 at 10:35
  • $\begingroup$ @StayOnTarget probably badly assembled by a cowboy in the past... $\endgroup$
    – Solar Mike
    Sep 7, 2021 at 10:45
  • $\begingroup$ In my case the two bearings are different sizes... the two washers are the same. So perhaps 1 washer would have done it but the second couldn't fit at the other (larger) end. $\endgroup$
    – StayOnTarget
    Sep 7, 2021 at 10:46
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I intuitively agree with Solar Mike, there should be one washer per bearing. I wanted to find a source/reference, however:

This image appears to show wave washers in front of each bearing motor cross section 1

But this image doesn’t appear to show any wave washers at all:motor cross section 2

So the short answer is: probably 1 washer per bearing, but it will of course depend on the exact motor design. We’ll need more information from you if you want us to comment further.

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Yes,only one wave washer at each end located under the bearings to add pressure to keep them in place.

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  • $\begingroup$ Did you have more to add to the answer? It seems like there could be more detail that you could add. $\endgroup$
    – hazzey ♦
    Feb 14 at 14:23

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