HS3540 Motor Slight Wobble, disc brake won't work

[floppy2floppy]

I have a Crystalyte HS3540 Motor that is about 2 months old, I got it from ebikessf.com. The motor runs great but it has a slight wobble to it. The wobble is not noticed while riding just if I pick up the back tire and give it throttle I can see the wobble, also the main problem is that I have a disc brake rotor on the motor, and the wobble moves the rotor enough that I can't have the brakes tight enough to provide good stopping power. If I tighten the brakes then it will rub at one point when the wheel does a full rotation. Does anyone have this problem, is this just the quality of these Chinese motors or can I do a bearing upgrade to tighten up the play in motor. Thank you in advance for the help.

 

[MadRhino]

Are you sure it's the motor that wobbles?
Check if your disc is straight, check that it is well seated and screwed tight.
Check your caliper alignment, and if the motor cover screws are all tight.
If everything is perfectly straight and tight, and providing that your axle is straight too, you have to replace the bearings.

I can't tell how long the originals usually last, for I upgraded them from the start on both H motors that I have here.
Yet, 2 month seems very short IMO.

 

[Hugues]

i have something similar on my HT, you can see the wobble , the freewheel moves up and down a bit and the chain is slightly pulled.

But it's not enough to have the same problem you have with your breaks. Annoying for sure.

 

[MadRhino]

Could be the bearing seat that is off center in the cover, then you'd have to CNC the cover and fit a larger bearing to make it centered.

 

[floppy2floppy]

Thanks for all the responses, I am new to the hobby and just want to make sure I stay safe with proper working brakes. I will search for how to change the bearing and to which one on this hub. Does anyone know off hand if I need any special tools to get the bearing out or is it something I can just do at home with common tools?

 

[Icewrench]

http://endless-sphere.com/forums/viewtopic.php?f=2&t=34970&p=509935#p509935

That thread deals with a similar problem on a 9c motor.
I think that there is a lot of off center machining on hub motors.

 

[botz244]

thats what the wheel is there for some buffer and the disc brake put a washer beteen the hub and your frame.space it out till it doesnt rub the caliper ,thats what i did.it doesnt matter if the hub and disc brake are perfectly centered its goin to have some wobble. if your worried about the little hub wobble dont pick up you car and look at those little wobbles either your hub is nothing to a car tire or rim or disc brake for that matter. what do you expect coming from the east for 300 had to vent happy new year