Buzzing noise from the hub motor

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gurkelur
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Buzzing noise from the hub motor

I got an EVT 168 2007 that has been traveling 800 km. Lately, I've been hearing an irritating buzzing noise from the rear wheel. Sounds a bit like a piece of plastic on a bike wheel. Under braking at higher speeds, this noise seems to be amplified. I thought it could be the brakes, but I can't figure out how to deattach them without brake fluid all over the place.

Any suggestions of what this might be?

Youtube video

Youtube video

Youtube video

Youtube video

Youtube video

Youtube video

Youtube video

reikiman
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Re: Buzzing noise from the hub motor

I didn't right away see your video link so it helps a lot to have that...

I assume you mean the zzzzzzz sound?

I don't think that's to do with the brake. My experience with the brake pads is they sound like a scraping sound not the zzzz sound in your video. It seems normal to have a little bit of brake pad contact on the disk.

Removing the brake housing is easy. That bolt top and center in the video is necessary. The only way you'll leak brake fluid is if you undo the hydraulic cable, so don't do that.

There's a fender over the wheel -- is it still in good shape?

Just rewatched it again closely. Noticed the disk appears to not be rotating evenly. I see that the housing for the pads is stable but that the disk is moving back and forth. This indicates the disk is not centered or otherwise not rotating as a pure circle.

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JamesS
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Re: Buzzing noise from the hub motor

I don't have a clue either, what the noise is. It's not just the rotor that isn't running true, The whole rear hub has an elliptical orbit. Is there any play in the rear wheel when up on the center stand. 800k isn't that far to have a bearing going out, but that would be my first guess. Keep us posted with what you find.

Happy scooting,
JamesS

Happy scooting,
JamesS

gurkelur
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Re: Buzzing noise from the hub motor

Thanks for the answers!

I did a more thorough inspection using my ears, and it does sound like the noise is coming from the center of the wheel / hub, not the brakes. The fender is intact.

Before I take anything apart, I'll call my dealer to decide what to do.

I'll post progress here monday. Thanks.

gurkelur
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Re: Buzzing noise from the hub motor

Seeing the video, my dealer had no idea as to what this could be. We agreed that I would unmount the motor and send it by mail so he could fix or replace it.

gurkelur
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Last seen: 9 years 10 months ago
Joined: Friday, July 25, 2008 - 16:26
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Re: Buzzing noise from the hub motor

Problem solved. The axle running through the motor was bent, and the bearings were destroyed as a result.

It could have happened during transport when I moved. To secure the scooter, the drivers used ropes to tightly press it to the floor without using the stand, leaving it there for tvelve hours.

Well, I dunno. I'm getting a new motor anyway :)

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