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XT rear mech

morleyman200morleyman200 Posts: 513
edited May 2012 in MTB workshop & tech
hi all, just come across with a problem with 2 of my rear mechs, boh of the XT, one being 2 and a hlaf years old, one being about a year old. both of them have always been well cleaned after rides.

the problem lies where the mech attaches to the frame, the bolt, bolts up fine, but once attached to the frame there is no movement in the link (part which attaches the bolt to the mech itself) before it has been able to move, it is where the torx screw is. ive tried squirting lubricant on it and soaking them in boiling water with fairy liquid and have also soaked them in white spirit. no luck

any ideas?

is this a known problem, as my deore rear mech which is about 1 and half years old, gone through the same cleaning, is fine, fully functioning.

Tom

Posts

  • The RookieThe Rookie Posts: 27,802
    Torx? Most are allen bolt.

    You want a decent penetrating oil on there and then working it to free it up and then lube it, boiling it with fairy sounds about the worst thing to do (Fairy contains salt).

    No idea why it's happened, my XT is fine.
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • morleyman200morleyman200 Posts: 513
    When I say torx, I mean the bit bellow the Allen key bolt which attaches it to the frame, its the hinge bellow that part, hmmm, I'll try some oils, got any recommendations?
  • The RookieThe Rookie Posts: 27,802
    Pics of which bolt you mean......
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • morleyman200morleyman200 Posts: 513
    hope the picture is clear, judging by the size of the bolt in comparison with a T25 key, i would estimate it to be a T30 maybe
  • Chunkers1980Chunkers1980 Posts: 8,035
    Why do you want to undo that bolt? There's no need.
  • The RookieThe Rookie Posts: 27,802
    As chunkers said, that bolt holds the cable abutment rigid, it ain't meant to move!
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
  • morleyman200morleyman200 Posts: 513
    really? ever since i got them both, they have moved, on my other standard deore it moves. thought it was meant to? im not trying to undo it, just thought it was a bolt for a pivot which moved, and now it doesnt move.
  • Chunkers1980Chunkers1980 Posts: 8,035
    It pivots, remove the circlip from the back and it may undo. Once mech in on it fixes and then acts as a pivot for the parallelogram
  • Chunkers1980Chunkers1980 Posts: 8,035
    Btw, it's only on shadow type, older it is done differently
  • morleyman200morleyman200 Posts: 513
    mine is a shadow rear mech, ill just try some oils, its annoying as the gear shifts arent as smooth, and when i try to take the wheel out, the rear mech wont move out the way, so i have to take the rear mech off to get the wheel off, annoying i know!

    Tom
  • Chunkers1980Chunkers1980 Posts: 8,035
    Well there's something up.

    The mech needs to pivot on that bolt, hence why you have rubbish shifting.

    You're saying that the bolt in the picture does not move?
  • morleyman200morleyman200 Posts: 513
    i havent tried to undo the bolt, as i dont have the correct torx key, but i know the bolt acts as a pivot, and now it is no longer acting as one, the whole unit is fixed around that bolt.

    just funny how its happened to 2 of my XT rear mechs, one being only a year or so old and the other being about 2.5 years old, and my deore one is fine, and thats as old, but all had the same cleaning treatment.
  • Chunkers1980Chunkers1980 Posts: 8,035
    So if you pop an adjustable spanner around the outside an lever it, it does not budge?
  • morleyman200morleyman200 Posts: 513
    if you try really hard to move the rear mech around the pivot, it will, but only with alot of force, but its that stiff, to change a wheel its easier to remove the rear mech, as its in the way of the drop outs.
  • YeehaaMcgeeYeehaaMcgee Posts: 5,740
    both of them have always been well cleaned after rides.
    This won't be of any help now, but I swear, some people clean their bikes so obsessively that they end up causing problems.
  • morleyman200morleyman200 Posts: 513
    i dont consider myself to be an obsessive cleaner, squirt a bit of muck off and wash off with a pressure washer
  • oodboooodboo Posts: 2,171
    i dont consider myself to be an obsessive cleaner, squirt a bit of muck off and wash off with a pressure washer
    Nooooooooooo
    I love horses, best of all the animals. I love horses, they're my friends.

    Strava
  • YeehaaMcgeeYeehaaMcgee Posts: 5,740
    Pressure washer, well... There's your problem.
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