Motor spinning but not engaging back wheel

[DeanosBeano]

Hi all

my E bike to day ( rear hub 250 watt 3 volt) decided it would not longer propell the back wheel , however i can hear the motor spinning in the hub and it seems to spin at an RPM in line with how i am using the twist grip or assist mode ,so iassume there is some kind off gear problem

i wonder if anyone knew of a good video / resource to help me fix the problem ?

CHeers

in advance

 

[DeanosBeano]

Hi sensors all good the motor spins as it should , the problem is the gear doesn't engage to the wheel / no bite
I'm gonna strip it down today having read the interweb I'm guessing the Woodruff key has sheared , I recall the panier getting trappped and jamming wheel last month could make sense

 

[Nealh]

It is possible the nylon planetary gears have been stripped or damaged.

 

[DeanosBeano]

Hi I've just checked and they are seemingly fine and no sign of plastic in the hub from wear
Update video

 

[wheeliepete]

Spin the wheel backwards, if no resistance is felt, then it is prob. a problem with the clutch.

 

[wheeliepete]

Just watched your video, deff. looks like your clutch is broken. What make is the motor?

 

[DeanosBeano]

Hiya
Cheers I'll check that avenue bout , it's a generic Chinese motor off eBay CsC bikes if i recall correctly . I'll try and see if BMS knows motor name .
Cheers for the tip . Are they a centrifugal clutch or something ,I wonder if my old motor will donate parts imagine nthat miracle Lol

 

[wheeliepete]

It's a sprag clutch, so spring loaded rollers and ramps. You can strip them by grinding down the rivets, but then they need welding back together.

They are available for some motors, contact CSC first if they supplied it, they are most likely to have spares. I doubt if BMS will be any help, they are not known for good CS.

 

[DeanosBeano]

Cheers mate Ive sent CsC a note and I have a welder at hand so hopefully I can fix one way or another cheers for info .

 

[DeanosBeano]

Sorted hopefully will update Tom at CsC sending one over for $20 nice after sales care

 

[DeanosBeano]

Well it's here I'll update when I've fitted it

 

[esuark]

hm, I`m surprised I have not seen this, had the same problem bought a new clutch and all fixed https://www.pedelecs.co.uk/forum/threads/bafang-clutch.42383/#post-634181

 

[DeanosBeano]

Fingers crossed mine be ok too let's see

 

[DeanosBeano]

Damn watch this space the new planetary gear set was NOT the fix LOL gutted but will persevere nontheless