Help! Knocking noise from the motor / freehub after 1500km

[novadriver]

After 1500km my rear hub motor with cassete freehub started making a knocking noise. Using headphones you can hear it very well.

I think it is the freehub and not the motor. The noise happens when the wheel is spinning freely and almost doesn't when the freehub is engaged. In the second video I only spin the pedals backwards and the noise still happens.

01. spinning by hand.mp4

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02. spinning pedals backwards.mp4

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What is broken?

 

[Nealh]

Freehub bearings or freehub loose and the threaded retainer needs torqueing up.

The second film was a bit dark but to me it looks like the cassette is wobbling a bit so I would first check the threaded retainer.

 

[novadriver]

Yes, you are right. The threaded retainer is loose.

 

[Nealh]

When it comes to noisy cassettes there aren't too many causes available.

 

[novadriver]

Yes, that was it. I fixed it. Thank you!