Have I lost a part?

[Kell]

The hex bolt that secures the 2-speed shifter on my Brompton dropped out the other day.

I only noticed as I had three speeds rather than the six I should have.

So I replaced it with another one, but I'm struggling with shifting on that side now. If I tighten it too much it won't move, and if it's too loose, then I run the risk of it dropping out again, plus shifting isn't great there either.

Does anyone have a link to an exploded diagram or a video that shows fitting and/or replacement? I wonder if there's a washer that's missing or something.

It's got to the stage now where it will only shift up or down if I pedal really gently and takes a good 30 seconds of continuous gentle pedalling to do so.

 

[John the Monkey]

I'm fairly sure that I found one when I was doing the cable replacement on my six speed. Assuming no-one answers before, I'll attempt to find the link again and post it once I get home.

 

[John the Monkey]

Right, the links I used;

http://www.ready-made.de/brompton-shifting-problems/ (decent views of the shifter)

http://http://www.sjscycles.com/pdffiles/drretrofitds.pdf (some diagrams)

I'm sorry that I can't find an exploded diagram of the shifter itself.

 

[Kell]

Thanks for those.

I've been playing about with the tension of the cable in the shifter, but hadn't realised there were limit screws on the chain pusher.

I'll have a look at the weekend.

 

[Rohloff_Brompton_Rider]

Sounds like you maybe missing the tiny m4 washer that fits under the changer mechanism. There's one under the replaced bold screw head and one under the mechanism.

 

[Kell]

I did wonder if that might be the case. Ordered some assorted washers and some threadlock.

 

[Kell]

PS - forgot to update this with a thank you

Added some washers and threadlock and played about with the limit adjusters. Was shifting fine for a couple of days and then the chain started jumping off the big ring.

Luckily I managed to stay on the bike the few times it happened, so I readjusted the limit screw and it seems to be shifting well and not jumping.