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  1. #1
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    Seal fell out of idler pulley?

    When I got back from a ride the other day I noticed that a small O-ring type seal had fallen out of the lower idler pulley of my old R600 tri-color rear derailleur. It looks like it seals the bearing in this pully to keep road grime out. It is ripped so it can't be reused. Do I need to replace it? Can I find a replacement part? Sorry if I'm not describing the issue well, I'm new to the sport and this happened after my second ride.

  2. #2
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by bchaney View Post
    When I got back from a ride the other day I noticed that a small O-ring type seal had fallen out of the lower idler pulley of my old R600 tri-color rear derailleur. It looks like it seals the bearing in this pully to keep road grime out. It is ripped so it can't be reused. Do I need to replace it? Can I find a replacement part? Sorry if I'm not describing the issue well, I'm new to the sport and this happened after my second ride.
    Are you sure it was from the pulley? Shimano doesn't commonly use any kind of seal in the pulleys of derailers.
    Stuart Black
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  3. #3
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    If it is still working OK-
    just ignore it.
    My guess is it is an inexpensive derailleur-and getting a replacement
    would be more trouble and as much money as paying $20 for a take off derailleur from Jenson-or a cheapo nashbar or ebay derailleur

    So just ignore it and plan someday to replace the derailleur
    You might consider occasionally spraying some lube on it
    I'm assuming it has a bushing-sleeve-not actual ball or roller bearings
    Ignore it

  4. #4
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    It was definitely from the pulley - it was hanging out of the pulley when I saw it. It looks like the seals in this picture (I think you're right that it's a bushing and not a bearing):

    http://www.cyclistno1.co.uk/assets/i...t/P1010363.jpg

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    It's a bushing pulley and the seal is of marginal benefit. Most bushing pulleys don't bother with seals, and depend of the baffle built into the side cap. Once in a long while, pull the pulley off, take it apart, clean, then oil it and put it back. This will keep the busing going beyond the practical life of the pulley or derailleur.

    Afterthought. If you decide you really want a seal there, remove the pulley and bring it and the related parts to a decent hardware store and see of you can adapt an O-ring to work.
    Last edited by FBinNY; 01-14-14 at 09:32 AM.
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  6. #6
    Warning:Annoying to jerks RaleighSport's Avatar
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    I happen to know of a tri color RD for sale over in the Classic and Vintage for sale section right now, think it's listed under mini group or something like that. If you decide it bugs you enough to replace it that is.
    “Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.”


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    Cannot imagine things surrounding the Bolt, like the pulley bushing dust shield , falling off without the bolt falling out...

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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by bchaney View Post
    It was definitely from the pulley - it was hanging out of the pulley when I saw it. It looks like the seals in this picture (I think you're right that it's a bushing and not a bearing):

    http://www.cyclistno1.co.uk/assets/i...t/P1010363.jpg
    Those look like they may have been after market. Still Shimano but a higher level than I've seen before. The ceramic bearings are the give away. As has been mentioned above, just take the o-ring to a good hardware store and get the right size.
    Stuart Black
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    Thanks for the help guys. I'll probably try to fit an O-ring in there. Bob, the seal was torn so it slipped out around the bolt pretty easily.

  10. #10
    Mister Bleak! mconlonx's Avatar
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    Seal fell out of idler pulley?

    Stop riding bicycle at the beach...
    Quote Originally Posted by Nicodemus regarding mconlonx View Post
    You, I don't generally think of you as clueless. You're kind of ok.
    I know next to nothing. I am frequently wrong.

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    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by phoebeisis View Post
    If it is still working OK-
    just ignore it.
    My guess is it is an inexpensive derailleur-and getting a replacement
    would be more trouble and as much money as paying $20 for a take off derailleur from Jenson-or a cheapo nashbar or ebay derailleur

    So just ignore it and plan someday to replace the derailleur
    You might consider occasionally spraying some lube on it
    I'm assuming it has a bushing-sleeve-not actual ball or roller bearings
    Ignore it
    Shimano 600 Tricolor was second from the top.

  12. #12
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    Quote Originally Posted by Grand Bois View Post
    Shimano 600 Tricolor was second from the top.
    So nice derailleur.
    I wonder what a used one goes for now?
    A reasonable take off replacement could be pretty cheap-wouldn't match, but.. Jenson seems to have lots of new OEM take offs-not sure how they come by them?
    I would probably just live with it-but I'm lazy-bushing will wear a bit-but so what-the plastic wheels will crap out before the unsealed bearing

    It would take a pretty great hardware store to match that o-ring
    Greatest in the world maybe.
    Might have more luck in bearing "store"-
    Last edited by phoebeisis; 01-14-14 at 04:48 PM.

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    I remember those O-rings on the 600 would work themselves out of the groove occasionally. A normal o-ring probably won't work as the original was a grooved ring. Without the o-ring you should just clean and lube the bushings a little more frequently and it will work fine although it might wear a little sooner due to the extra grit getting in there. Jockey wheels are cheap when it comes time for replacement.

  14. #14
    Senior Member GeneO's Avatar
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    Quote Originally Posted by cyccommute View Post
    Are you sure it was from the pulley? Shimano doesn't commonly use any kind of seal in the pulleys of derailers.
    Sure they do. The top pulley on 6700 derailleur has rubber oring. I have had one come out twice.
    I managed to shove the last one back in
    2012 Felt F55X

  15. #15
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by GeneO View Post
    Sure they do. The top pulley on 6700 derailleur has rubber oring. I have had one come out twice.
    I managed to shove the last one back in
    The operative word is "commonly". We have a box of derailer pulleys at my local coop that has dozens of pulleys in it. Not a single one has any kind of seal in it. I've taken apart many, many derailers from XTR to Tourney over the last 30 years and never seen one. It seals were "commonly" used, I'd think I'd have some by now.
    Stuart Black
    Solo Without Pie. The search for pie in the Midwest.
    Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
    Days of Wineless Roads. Bed and Breakfasting along the KATY
    Twisting Down the Alley. Misadventures in tornado alley.
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  16. #16
    Senior Member GeneO's Avatar
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    Sorry, I just thought ultegra rd were considered common
    2012 Felt F55X

  17. #17
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    Quote Originally Posted by GeneO View Post
    Sorry, I just thought ultegra rd were considered common
    You don't get it. If it doesn't routinely show up at the right shop in Colorado, it isn't common (at least as defined by certain people)
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  18. #18
    Senior Member GeneO's Avatar
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    Oh, Colorado, now it makes sense. LOL. Just kidding, no offense - stuck in Dulles for 7 hours after a 9+ hour plane ride and getting loopy.
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