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D/A rear shifter problem(10 posts)

D/A rear shifter problemcurlybike
Feb 19, 2002 4:27 PM
Dura/Ace rear shifter inner lever will not release the cable to make shift to smaller cog, unless you hold the big lever in position. Any ideas or known cures? is the lever dead?? I cleaned it out, but it was really clean, no change.I lubed it really good with lite oil, no change. Any ideas are welcome. Thanx
cable problem?Kerry Irons
Feb 19, 2002 4:47 PM
Are you sure that the cable is free? Put some pull tension on the cable and see if it moves freely when shifting. It may be cable friction either due to a burr or to dirt rather than the shifter malfunctioning. Even if the cable is free under the handlebars, it could be a problem at the rear derailleur, or it could be the derailleur itself.
cable problem?curlybike
Feb 19, 2002 8:57 PM
I was pulling on the cable. The shifter works perfectly if you hold the brake lever. If you dont keep the brake lever from moving, the little inner lever will move it slightly and the ratchet will not release the cable.
re: D/A rear shifter problemChen2
Feb 20, 2002 6:58 AM
Someone posted this problem before. I think it had to do with a loose part in the shifter causing the small lever to drag against the brake lever. Sorry I can't help more, maybe you can find it in the archives, but it was months ago.
-Al
re: D/A rear shifter problemSamcat
Feb 20, 2002 9:37 AM
Probably a dead spring...not uncommon...warranty issue.
Take it back. Shimano will replace it.

Sam
re: D/A rear shifter problemcurlybike
Feb 20, 2002 11:52 AM
Thanks for taking the time to respond. I am going to do the WD-40 flush. If that does no good, I will pursue the warranty option.
Check thisgrzy
Feb 20, 2002 4:03 PM
See if the little screw is missing from the backside of the big lever. If the two levers aren't held in the proper relation to each other then things get ugly.Compare to the other lever. I've only seen this happen on Ultegra, but the DA design is very close - just lighter materials. In any event the springs start popping off their pins and things get really sloppy. The lever gets loose and rattles. Rebuilding them is a bear. I would strongly advise holding off on the WD-40 option - the stuff will really dilute any lubrication in there. things will work better initially, but then they'll start to wear. You'll have a tough time getting any warranty action after this.

Having said all of this I really think you're dealing with some sort of cable problem - I've seen this pattern. You would have trouble in every gear if your lever was AFU, not just the bottom one. Replace both the housing and the cable. Pull off and clean the rear der. while you're at it. You could even have the cable end stop not seated correctly in the shift lever - it happens. Until you replace the cable AND all of the housing you're just guessing. One other thing to check is to see if you have the correct lock ring on your cassette. One that is too large will prevent the chain from fully dropping into gear. You may also be dealing with a chainline issue. You need to play detective and start at the back of the bike and work forwards. With proper care and feeding DA stuff should last for a very very long time or at least unitl the next wreck ;-(
Check thiscurlybike
Feb 20, 2002 7:47 PM
The little screw is there. It is AFU in every gear.The problem exists with just the inner wire present(or missing) with the shifter in hand off the bike. It makes no difference if you pull on the cable or not. If you keep the brake lever in position, the inner lever shifts in the direction of smaller cogs perfectly. I will be calling for a RMA# tomorrow. Thanks for trying to be a help. I was hoping someone had found some obscure problem and fix. I guess she will have to use her spare bike. I told her that I could fix Italian stuff, but she had to have S., At least they are good about warranty. Thanks again.
Check thisgrzy
Feb 21, 2002 9:48 AM
That pretty much confirms the worst - sounds like the shifter is AFU. I was hoping it might be something simple. I've rebuilt them, but would NOT advise it - especially if you can get warranty service. Hope the replacement is quick. Worst case you can got to www.shimano.com on the Urup section and get the PN for the sub-assembly from the exploaded view and save yourself a lot of money. Many US shops will tell you that you have to buy a whole new set.
Check thiscurlybike
Feb 21, 2002 11:24 AM
Got a RMA # today to send for warranty. Thanks for your thoughts.