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-   -   Seal fell out of idler pulley? (http://www.bikeforums.net/bicycle-mechanics/929817-seal-fell-out-idler-pulley.html)

bchaney 01-14-14 08:16 AM

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.

cyccommute 01-14-14 09:07 AM

Quote:

Originally Posted by bchaney (Post 16409538)
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.

phoebeisis 01-14-14 09:13 AM

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

bchaney 01-14-14 10:11 AM

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

FBinNY 01-14-14 10:18 AM

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.

RaleighSport 01-14-14 10:21 AM

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.

fietsbob 01-14-14 10:49 AM

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

cyccommute 01-14-14 12:49 PM

Quote:

Originally Posted by bchaney (Post 16409857)
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.

bchaney 01-14-14 01:55 PM

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.

mconlonx 01-14-14 02:05 PM

Seal fell out of idler pulley?

Stop riding bicycle at the beach...

Grand Bois 01-14-14 03:11 PM

Quote:

Originally Posted by phoebeisis (Post 16409674)
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.

phoebeisis 01-14-14 05:37 PM

Quote:

Originally Posted by Grand Bois (Post 16410868)
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"-

Crankycrank 01-14-14 06:25 PM

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.

GeneO 01-15-14 03:25 AM

Quote:

Originally Posted by cyccommute (Post 16409660)
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 :D

cyccommute 01-15-14 06:43 AM

Quote:

Originally Posted by GeneO (Post 16412255)
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 :D

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.

GeneO 01-15-14 06:18 PM

Sorry, I just thought ultegra rd were considered common

FBinNY 01-15-14 06:27 PM

Quote:

Originally Posted by GeneO (Post 16414324)
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)

GeneO 01-15-14 06:52 PM

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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