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Shimano 6400 Braze-on Shifter question

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Shimano 6400 Braze-on Shifter question

Old 05-28-18, 01:51 AM
  #1  
taguy4
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Shimano 6400 Braze-on Shifter question

I have a set of these downtube indexed shifters and I question whether the left (front derailleur) one is installed and working as it should. I haven't been able to find any instructions on how to install these: the closest I've found is for the model 7800 shifters. First of all how does the circular piece that goes over the brazed on downtube boss get oriented? Then how is the shifter supposed to be oriented over that because I've found there is only one way that it will key together. I have installed it so that the large tab on the flat surface of the circular ring faces towards the bottom bracket; then when I install the shifter it keys in so the shifter has no forward stop, but it stops when you pull the shifter down quite a ways which seems backwards to me, although it allows you to be able to shift the deraileur. The instructions for the 7800 downtube shifters say to orient the large tab toward the head tube which I can't get to work at all. It's almost like the mechanism inside the shifter got turned around somehow; either that or this shifter is supposed to work without an upper stop.

Thanks for any help.
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Old 05-28-18, 05:06 AM
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hazetguy 
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I had the same confusion when I was installing the left shifter on my Trek. I eventually figured it out, but my conclusion seemed odd, so I did a little (actually a lot) of weeding through threads to see if what I came up with was correct. You kinda have to preload the shifter on the base when installing it.
this was the most helpful thread I found, with pics, and a good description of the process in post number 3.
next problem: 600 DT shifter alignment
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Old 05-28-18, 02:29 PM
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taguy4
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I actually had it that way when I was playing around with the thing, but thought it couldn't be correct to have it that way. I guess it was right after all to have it that way. When you have it set like that you really have to tighten the thumbscrew down a lot to keep the shifter from rotating back around since these is so much spring tension on it then, which seems counter-intuitive if Shimano was going for a "light action" feel like it says on the shifter. I think I would much rather just have a regular friction shifter without a spring in it.
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