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Old 08-18-14, 12:12 PM   #1
hazben1
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Ultregra RD pulleys

I am working on my Ultrega RD and I found the pulley closest to the cassette does not turn very freely. My other pulley I can spin it a few revolutions before it stops. The one closest to the cassette with the ceramic bearing and rubber cups which set into the pulley won't spin. It also does not seem to be centered in the cage. Not sure if it should be.

I am thinking I may be missing some washers/spacers. I could not find a diagram showing if it has pulleys with it. Also what oil should I be using on these pulleys? Thanks
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Old 08-18-14, 07:39 PM   #2
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It is a common service to take the pulleys apart and clean then lube the bearing/bushing. The tight spin could be grit in there of maybe seals that are dry or twisted. (The seal has a "U" shape cross section with the open side toward the outside.) As to the pulley's not being centered, maybe what you are seeing is the pulley sitting at one end of it's end play. The upper pulley has a bit of free play, side to side, to allow for slight corrections of SIS system off tolerances. Andy.
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Old 08-18-14, 08:26 PM   #3
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That jockey wheel has an o-ring and the other does not. It is meant to move a bit more freely axially to keep the chain aligned - I don't think it turns as freely, or needs to. I have also had the o-rings get misshapen and slip out.
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Old 08-18-14, 08:37 PM   #4
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Pulleys have very little rotational inertia and so it takes very little (very, very, very little) friction to have them seem like they don't spin. If they're old, you might clean and oil them, but otherwise seal drag will have them acting sluggish. (compare throwing a baseball and wiffle ball, into a high wind, which goes farther).
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Old 08-19-14, 04:12 PM   #5
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Thanks for the info folks. I checked and it doesn't have much if any side to side play. The U-shaped rubber seals are turned the right way and the ridged washer thing which sits inside the rubber U seems to be where it should be. I suspect you are correct a lot of the lack of spinning may be the outside washer thing making contact with the rubber U.
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