elveepee

I have a completely dis-assembled 7 speed Shimano SIS bar end shifter. Can anyone furnish a schematic or instructions for proper reassembly? Thanks in advance.

DMF 

Got a model number?

elveepee

All it has is Shimano 8S. I sat and studied how it would logically have to go together. I couldn't figure the internal spring at first, but I imagine it is a preload against the derailer. There are also two fragile brass ring type pieces and a couple of pieces that seem to be dimpled to fit together to form detents for the indexing feature. The front ring shifter seems to be preloaded to counteract the spring on the front derailer. I put it all together as it seemed logical and as the parts seemed to fit together. I left the spring out at first but went back into it after I installed the other front bar end shifter (for the front derailer) and noticed that it had a preload. I had already asked my LBS if they knew anything about them and I had even written to Sheldon Brown to see if he knew anyone who worked on them. He was very responsive but unable to tell me who might rebuild it. Anyhow, it is now on a Lotus Challenger that I am rebuilding and I can tell you more about its performance in about a week. Maybe someone else has one that is in pieces and is wondering also!!

Here is a copy of my correspondence with Sheldon:
At 7:45 PM -0700 12/23/07, Lloyd Payne wrote:
>Sheldon,
>I have Shimano 7 spd. barend shifters. The rear shifter is either
>indexed or friction. The inner workings are messed up on the rear
>shifter. Can I get the parts to rebuild it? If I mailed it to you do
>you rebuild them? I would like to get it repaired but my LBS doesn't
>have parts or interest in the project. I live 55 miles from the shop
>and it is the only one within 127 miles. I would appreciate your
>assistance.
>Sincerely,
>Lloyd Payne
>Lordsburg, NM 88045


Sorry, these are not generally reparable if they have internal problems.

However, there's a common thing that happens to these if they get
taken apart and re-assembled incorrectly.

There's a square fitting where the index unit attaches to the body of
the shifter mount. If this square is assembled in the wrong
orientation, the index clicks won't work properly.

It's easy to fix, just undo the screw, rotate the unit 90 degrees and
screw it back together.

All the best,

Sheldon

Jeff Wills

As Sheldon said, the ratcheting mechanism isn't usually taken apart. I sure haven't seen a diagram of the internals. However, here's an exploded diagram of what can be taken apart:
https://techdocs.shimano.com/media/te...9830628723.pdf
for the 9-speed shifter. It shows the proper orientation of the toothed washer.

As far as I've seen, the 7-, 8-, and 9-speed shifters are identical, except for the detents, of course.

elveepee

Thanks for the link. My shifter was completely in small pieces. Where the picture in the link shows the shifter body, a separate piece, and then another complete assembly, my complete assembly as seen in the link consisted of about 8 or 9 smaller parts, namely a square helical coil spring of about 5 coils with each end turned to fit presumably in two holes in different pieces, two small washer looking parts, one having dimples and the other looking concave like a bearing race, one very thin flat brass? washer, another brass cup shaped washer, which I figured had to fit together appending, and a fiber or plastic washer, and two or three other castings.

I finally got it all together the first time minus the spring and then had to redo it to include the spring. It worked without the spring except that there was no preload to counteract the spring force of the dérailleur. It even would work in either indexed or friction mode. It is working now and it has preload, and it is on the bike!! As Sheldon mentioned, it's not made to be taken apart or serviced.