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Old 01-14-14, 08:16 AM   #1
bchaney
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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.
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Old 01-14-14, 09:07 AM   #2
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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.
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Old 01-14-14, 09:13 AM   #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
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Old 01-14-14, 10:11 AM   #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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Old 01-14-14, 10:18 AM   #5
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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.
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Old 01-14-14, 10:21 AM   #6
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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.
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Old 01-14-14, 10:49 AM   #7
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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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Old 01-14-14, 12:49 PM   #8
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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.
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Old 01-14-14, 01:55 PM   #9
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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.
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Old 01-14-14, 02:05 PM   #10
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Seal fell out of idler pulley?

Stop riding bicycle at the beach...
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Old 01-14-14, 03:11 PM   #11
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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.
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Old 01-14-14, 05:37 PM   #12
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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"-

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Old 01-14-14, 06:25 PM   #13
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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.
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Old 01-15-14, 03:25 AM   #14
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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
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Old 01-15-14, 06:43 AM   #15
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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.
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Old 01-15-14, 06:18 PM   #16
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Sorry, I just thought ultegra rd were considered common
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Old 01-15-14, 06:27 PM   #17
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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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Old 01-15-14, 06:52 PM   #18
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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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