Is there a Tongxin expert in the house?

[Pedalo]

I have a broken Tongxin motor as reported near the end of this thread:

http://www.pedelecs.co.uk/forum/electric-bicycles/7300-electric-brompton-stopped-working.html?

Basically the problem is that the motor makes a noise and you can hear something spinning inside but the wheel doesn't turn.

Jerry kindly lent me his special tool he made up for taking a Tongxin apart. Having got the motor apart I can see the cause of the problem:

As can be seen the outer ring around the planetary rollers looks to have cracked - which presumably means the rollers are no longer able to turn it and just slip.

If I can get hold of another motor (perhaps broken in some other way), does anyone know how easy it would be to replace this? I think getting the old ring off might be O.K. but since it's necessarily a tight fit I suspect it would be hard to get a new one on?

 

[jerrysimon]

As I guessed a cracked freewheel ring. It seems a common problem and has been reported by a few users. I have no idea why it happens or how to prevent/delay such a failure

At least you have a couple of motors and can swap parts between the two if need be to extend the life of one hub motor.

On second thoughts just checked your pic again its the main ring not the ring that comes off

These are my pics

And the link where I took the motor apart.

Regards

Jerry

 

[mj8765]

Motor ring

Hi

We have some replacement rings - but it is a "bit of a bugger" fitting them and requires a special tool (which we have) or we can sell you a new motor to swap the inners into your wheel.

Feel free to give me a call.

Martin Jackson
Home page
0845 094 2735

 

[HarryB]

What you have found is a known weakness and happened to me. Cytronex have the tools and expertise to fix the motor - try giving them a ring.

 

[jerrysimon]

Hi

We have some replacement rings - but it is a "bit of a bugger" fitting them and requires a special tool (which we have) or we can sell you a new motor to swap the inners into your wheel.

Feel free to give me a call.

Martin Jackson
Home page
0845 094 2735

Martin great to see you supporting us Tongxin owners

Regards

Jerry

 

[Pedalo]

Hi

We have some replacement rings - but it is a "bit of a bugger" fitting them and requires a special tool (which we have) or we can sell you a new motor to swap the inners into your wheel.

Feel free to give me a call.

Martin Jackson
Home page
0845 094 2735

Thanks for replying Martin and for providing some options. It was good to talk to you.

As I mentioned on the phone, fortunately I do have another motor which has been keeping me on the road for now at least. I'm hoping my working motor will keep me going over the next few months, by which time there might be some other interesting options to consider ;-)

Thanks again.