Re: Fork/Steering slop?

Lee Snover /
This single post is part of a larger thread. Start from the top or view this post in context.

> Norris Hall Wrote:

> -------------------------------------------------------

> I just had this exact same problem on my Motobecane. The races are

> threaded onto the inner tube and just needed cinching up a bit. It can

> be tricky to wrap your head around because from the outside they don't

> look like anything but a bushing but they are actually threaded nuts

> that are used to take up the play between the upper and lower bearings.

> I know your design is probably different but thought it might help

> anyway.

I understand. I don't think that is the issue. Not sure about Motobecane, but Puch has a somewhat crappy design here with regards to the fork yokes, especially the top yoke.

I believe the main tube is welded to the lower yoke. You drop a ball race in down the tube, you drop your balls and cage in, grease em up. Next comes the female tube in the frame. That has the upper race friction fit (tightly) into the female tube. Push the male tube/yoke/fork assemly up into the female frame tube. The weight of the moped holds that in pretty good.

Now we move to the top of the female frame tube. We have a friction fit lower ball cage. Grease em up. Next the balls and cage. Grease em up. Then we have a top bearing cage/cup. Then a flat washer, then a threaded adjustable retainer. THis allows you to adjust the "squeeze for both sets of bearings top and bottom. At this point, the fork shocks are dangling above and the male fork tube is poking up throug the frame. There is still a bit of slop here, as the tube can move slightly in any direction, 360 degrees.

You now put the top yoke on. Put the two bolts into the yoke to hold the upper shock tubes. Now there should be a THIN flat washer on the main male fork tube, and finally the Chrome threaded top cap. All well and good.

I think the design is a bit of a fail, as there is nothing positively holding the upper yoke to the bearing assembly, it is dependent on pressure. Flat plate on smooth surfaces (washers), allows it to move. If the hole in the yoke is elongated in any way, it is subject to slopping around. There should be a more substantial mechanical connection to the fork tube assembly, or the upper yoke should be thicker/more substantial to avoid deformation and allowing a positive clamp force.

What is the recommended torque on the top cap bolt?

Cheers!

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Fork/Steering slop?Topic by: Lee Snover Lee Snover 08/21/19 12:07AM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 12:41AM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 12:50AM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 01:32AM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 02:04AM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 02:24AM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 02:26AM
  Re: Fork/Steering slop?Re: Stephen Keller Stephen Keller 08/21/19 02:57AM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 06:47AM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 07:48AM
  Re: Fork/Steering slop?Re: Tone It Down Tone It Down 08/21/19 10:38AM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 12:30PM
  Re: Fork/Steering slop?Re: Tone It Down Tone It Down 08/21/19 06:32PM
  Re: Fork/Steering slop?Re: Mike Boyd Mike Boyd 08/21/19 06:36PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 08:13PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 12:29PM
  Re: Fork/Steering slop?Re: Tone It Down Tone It Down 08/21/19 10:32AM
  Re: Fork/Steering slop?Re: Daniel '' Daniel '' 08/21/19 01:45AM
  Re: Fork/Steering slop?Re: Mike Boyd Mike Boyd 08/21/19 04:26PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 04:35PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 05:07PM
  Re: Fork/Steering slop?Re: Mike Boyd Mike Boyd 08/21/19 06:00PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 06:25PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 08:15PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 09:05PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 09:14PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 09:21PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 09:32PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 09:40PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/21/19 09:47PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/21/19 05:09PM
  Re: Fork/Steering slop?Re: Norris Hall Norris Hall 08/22/19 04:46PM
  Re: Fork/Steering slop?Re: Lee Snover Lee Snover 08/22/19 06:29PM
  Re: Fork/Steering slop?Re: live ɘvil live ɘvil 08/22/19 06:39PM

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account