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Shimano 600EX downtube shifter horror.

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Shimano 600EX downtube shifter horror.

Old 10-16-12, 11:36 AM
  #1  
Branimir
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Shimano 600EX downtube shifter horror.

Yes, I broke the downtube shifter's tabs.


http://sheldonbrown.com/gloss_aa-l.html#600

If I got this right, I could still use the shifter in the friction mode, right?

And I've rotated the thing to friction mode, but:

When I pull the lever towards me, the tightening screw unscrews a bit, when pushing the lever forward, it stays put, when pulling, it unscrews the screw again a bit - repeat the action 20 times, and the lever cannot be held in place, and always comes back to the maximum forward position (that is - the smalles cog on the cassete).

Is there a way to fix this? I don't really care about the indexed shifting, I'm fine with friction, should I tighten the screw beyond common sense to secure the shifter, or the tabs are a crucial part of the system?

This is so frustrating

ps: it seems I've tightened the screw now enough so it does not unscrew when using the shifter, though I need to take a bike for a ride a shift like a madman to see if it will unscrew again. I don't feel like going for a 100km run tomorrow morning with a busted shifter. I could carry a screwdriver, but that kinda defeats the purpose of a working shifter.

Last edited by Branimir; 10-16-12 at 11:40 AM.
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Old 10-16-12, 12:10 PM
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I have a left bar end shifter with the exact same problem - broken tabs, so it won't stay set. The large notch has to stay put, and now has room to move. I've considered super gluing the whole notched spacer unit to the shifter assembly. I wonder if anyone has ever disassembled a Shimano SIS shifter, and swapped out parts?
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Old 10-16-12, 05:30 PM
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I had a Shimano 600 shifter, on a Centurion Dave Scott Ironman, that wouldn't hold one particular gear. St. Sheldon diagnosed via intertubes that it was (a) broken internal tab(s).

I could never get the friction mode to stay the right tension, either, but attributed it to poor wrenching on my part.
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Old 10-16-12, 05:33 PM
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Loctite, perhaps?
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Old 10-16-12, 05:50 PM
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Sometimes you can find replacement inserts for the 600 shifters.

Loose Screws has some 6spd shimanos for about $40 http://loosescrews.com/index.cgi?d=s...&id=4952132314
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Old 10-16-12, 06:05 PM
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Thanks for the suggestions. I've inspected my downtube shifter once again. Okay, the SIS mode is gone, so I tried with friction.

No way - something's busted here, either washers or the whole lever. It's impossible to tighten the screw, it keeps unscrewing with the movement of the lever. Maybe the threads on the downtube are busted, but I cannot see how that could be the issue since you can overtighten the screw, but still be able to unscrew it with the lever.

Now I'm kind of biased against the 600 shifters, have checked upon ebay for replacement, but I know this will probably happen again.

I'm looking into http://www.njuskalo.hr/bicikl-pogoni...-oglas-4763525 this for 8.8$ locally. Hopefully it'll do the work it's supposed to do. I know I will have two different downtube shifters, but I prefer my bike in ridable condition, rather than waiting for weeks for an overpriced replacement that will suffer with the same construction faults as the original one.

Though I enjoy the rest of the 600 group on the bike, it works and performs nicely.
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Old 10-16-12, 06:49 PM
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The earlier production runs on those had a known defect: they either broke or they were going to. I heard it was fixed by the end of 1986, but I don't know for sure. A. Winthrop told me about it. I'll send him an email.
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Old 10-17-12, 06:25 AM
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And the final solution, I'll witness the results in 2 hours
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Old 10-17-12, 06:31 AM
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These shifters aren't hard to come by - see if someone has a set they'll part with in the For Sale forum.

-Kurt
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Old 10-18-12, 05:08 AM
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I have applied the Loctite 243 to the screw and also to the threaded hole on the down tube brazeon for shifter. At first it seems I applied too little of it, so after 2 hours of drying - the bolt got loose anyway. Second time I applied alot of the stuff (mentioned in the first sentence), to the screw and the threaded hole. Tightened it alot with a screwdriver, and left it to dry overnight.

This morning I commuted a little and tried the shifter, it's tight, but still not too much, the lever works okay and the screw did not unscrew with moving the lever. Though I have not tried to shift like a maniac - but so far it did not fail me and the screw is kept securely in the place. On saturday I'll go for a 100km ride and see how it responds.

Originally Posted by cudak888 View Post
These shifters aren't hard to come by - see if someone has a set they'll part with in the For Sale forum.

-Kurt
Yes I saw an auction on ebay for small money with seller being in Poland, something like 9$ shipping which is pretty cool, though I think the main problem (with the SIS being broken) are the busted threads in the downtube, so a new shifter lever would have the same problems as the old one. Fortunately, friction still works with this shifter (at least I managed to make it work), so I'm going to use it for some time. When I'll have money, I'll order a working 600 shifter and redo the Loctite process, it seems it works. For now - I'll just ride!

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Old 10-18-12, 05:18 AM
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mix up some JB weld, coat the screw/bolt, and tighten it in, let dry for a couple of days. often works, but I'm not sure it's the best solution.
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Old 10-18-12, 09:00 AM
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Originally Posted by RobbieTunes View Post
mix up some JB weld, coat the screw/bolt, and tighten it in, let dry for a couple of days. often works, but I'm not sure it's the best solution.
Thanks Robbie - It works - Don't know how long it will hold up but had to give it a try - For the most part I am a friction shifter only guy anyway...
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