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9 Speed Dura Ace (7700) Shifter Sticks after rebuild

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9 Speed Dura Ace (7700) Shifter Sticks after rebuild

Old 12-09-09, 03:15 PM
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Bnjmn
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9 Speed Dura Ace (7700) Shifter Sticks after rebuild

I took apart my 9 speed Dura Ace shifter/brake levers to clean/lube them. Upon re-assembly, the brake/shift lever no longer seems to be spring-actuated.

1. I tucked the spring into the spring holder/faceplate piece, anchoring the spring anchor in the faceplate notch for the spring anchor.



2. I then lined up the other spring anchor with the hole @ 7 o'clock in the face of the shifter (pictured)



3. Then I screwed on the spring holder/faceplate piece (fits flush/properly to shifter/brake body)

4. But the downshift lever (the brake lever) does not spring back into place after downshift actuation



5. And to get the downshift lever (the little lever) to work, I need to push the big lever to the outside



Anyone have any suggestions? I tried installing derailleur cable and tugging on it to mimic the RD spring, but the shifter still behaves the same.
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Old 12-09-09, 03:27 PM
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I just rebuilt my Shimano 105s (5510). You need a special tool for the locknut and the return spring tool is helpful.

Check out this website, it addresses Dura Ace ...
https://www.norvil.net/pedal/service/...osti/index.php
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Old 12-09-09, 03:43 PM
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Here is the parts list for the 7700s ... https://techdocs.shimano.com/media/te...9830628724.pdf

The 7700s are a bit different than my 105s but it sounds like your problem is from the return spring, #7 on the diagram.

It is critical that the spring be loaded by keeping the end over a tab, probably on the big lever, otherwise your lever won't automatically return to the vertical position.

The spring tool is basically a thin hollow tube that allows you to keep the spring aligned with the tab during reassembly.
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Old 12-09-09, 03:53 PM
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I would also check to make sure the release plate return spring, #13 is put in correctly. My 105s don't have this, so I'm not sure what it looks like up close. You just have to make sure that both ends of the spring are anchored on something.

Before I had a spring tool, I used a short piece of the red tube used to direct the flow in a WD-40. This works, but it took me a lot longer doing it this way because the WD-40 tube is too flexible. The tube is used to hold the end of the spring in place because your fingers aren't small enough to hold it in place.
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Old 12-10-09, 10:42 AM
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5. And to get the downshift lever (the little lever) to work, I need to push the big lever to the outside
That's normal. The levers are interlocked so they can't be actuated together..
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Old 12-10-09, 10:54 AM
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I am having a bit of problem. The spring (#7) is lining up and the faceplate is fully seating, but there is still no return action on shifts with the big lever. I am not sure what trail-rider meant by "keeping the end over a tab" --- I have it so the tangs on the spring are in the circular depression on the faceplate and on the front of the shifter body.

Also - how can it be normal to need to push the little lever to the outside to perform little lever shifts? Two handed shifting is normal? I think this push is normally provided by the return spring.
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Old 12-10-09, 11:07 AM
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Yes it is.
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