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Out of one hole, and into another . . .

dr.adr.a Posts: 120
edited September 2011 in MTB workshop & tech
Hey all. So, I finally got the piece of broken hanger removed from my SRAM X7 derailleur (hooray). I attached the derailleur to the new hanger (which was on the frame already as I replaced that part a while back) and when I routed the chain on etc, the tension pulley is swinging a LOT. There's no tension in the chain now. So, I tried to remove the derailleur but the allen key hole has rounded off, rendering it impossible to remove the derailleur now.

I think, with the loose tension pulley, that the derailleur might be broken?

>.<!
"If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

2002-2007: Terrano Bullion
2007-2008: Apollo Guru
2008-2010: Shockwave XT980
2010: Carrera Fury 08

Posts

  • Is the 'B' adjustment screw butted up against the derailleur hanger? If not that would explain the lack of tension.
  • dr.adr.a Posts: 120
    How do you mean?
    "If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

    2002-2007: Terrano Bullion
    2007-2008: Apollo Guru
    2008-2010: Shockwave XT980
    2010: Carrera Fury 08
  • der117.jpg
  • dr.adr.a Posts: 120
    Thanks for the illustration, I'll go and have a check now
    "If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

    2002-2007: Terrano Bullion
    2007-2008: Apollo Guru
    2008-2010: Shockwave XT980
    2010: Carrera Fury 08
  • dr.adr.a Posts: 120
    I adjusted the screw in question, but it made little difference. Hopefully the attached images will clear things up ^-^

    This pic. shows the long part of the derailleur, which is swinging.

    derailleur1.png

    This pic. shows how the chain is resting.

    derailleur2.png
    "If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

    2002-2007: Terrano Bullion
    2007-2008: Apollo Guru
    2008-2010: Shockwave XT980
    2010: Carrera Fury 08
  • dr.adr.a Posts: 120
    I don't think the links worked in the previous post.

    303814_246427978736293_100001072774968_653090_1631869673_n.jpg

    303814_246427995402958_100001072774968_653091_1859705131_n.jpg

    303814_246428002069624_100001072774968_653092_741683074_n.jpg
    "If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

    2002-2007: Terrano Bullion
    2007-2008: Apollo Guru
    2008-2010: Shockwave XT980
    2010: Carrera Fury 08
  • It looks like the Rear Derailleur Torsion Spring inside the cage assembly has broken or come loose. See item 5 on page 23 of attachment:

    http://www.sram.com/sites/default/files ... _rev_a.pdf

    As its available as a spare part in its own right you should be able to dismantle.
  • dr.adr.a Posts: 120
    I've seen the X7 priced under £40 on CRC. If I was to buy one, which would be the correct option? Long short or medium cage?
    "If you're sleeping', you're not gonna play anything" - John Petrucci, 2004.

    2002-2007: Terrano Bullion
    2007-2008: Apollo Guru
    2008-2010: Shockwave XT980
    2010: Carrera Fury 08
  • cooldadcooldad Posts: 32,599
    Long.
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  • Derailleur cage length explained on sheldon brown: http://sheldonbrown.com/derailleur.html

    For the X7, the tooth difference is 37 for medium cage, and 45 for long. See page 40: http://www.sram.com/sites/default/files ... -rev-a.pdf
  • cooldadcooldad Posts: 32,599
    Long
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • NorthwindNorthwind Posts: 14,675
    Getting it back out, if the allen hole in the mech is stripped, is a job for a big easy-out, or grinding a slot onto the end of the bolt and using a screwdriver, or possibly mashing in a slightly larger torq bit but you'll want to be careful with that as it could make things worse.

    Does sound like the mech is probably foobarred though.
    Uncompromising extremist
  • NorthwindNorthwind Posts: 14,675
    Getting it back out, if the allen hole in the mech is stripped, is a job for a big easy-out, or grinding a slot onto the end of the bolt and using a screwdriver, or possibly mashing in a slightly larger torq bit but you'll want to be careful with that as it could make things worse.

    Does sound like the mech is probably foobarred though.
    Uncompromising extremist
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