Front mech- triple

mcowan77
mcowan77 Posts: 560
edited April 2013 in Workshop
Shimano sora triple road bike

Just replaced gear cables granny to middle is to problem but it won't shift up to the big chainring

Any ideas?

Cheers

Comments

  • redvee
    redvee Posts: 11,922
    Cable tension?
    I've added a signature to prove it is still possible.
  • mcowan77
    mcowan77 Posts: 560
    Cant get it any tighter
  • desweller
    desweller Posts: 5,175
    mcowan77 wrote:
    Cant get it any tighter

    How come?

    Weller's non-patent method of setting front derailleurs:

    1. Release the cable clamp
    2. Wind the barrel adjuster all the way in
    3. Set your gear shifter to it's lowest point
    4. Wedge something soft (e.g. a bit of wood) between the derailleur and the frame to get it just off its limit screw
    5. Pull the cable tight and reclamp
    6. Remove the bit of wood and test your shifting

    Now if you're short of tension (which you almost certainly are) you should be able to wind the barrel adjuster out until the shift is good. If it's not playing ball then you need to check that the derailleur is parallel to the chainrings and that the upper limit screw has been sufficiently wound out to allow the derailleur to reach the upper shift point.
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    On Strava.{/url}
  • redvee
    redvee Posts: 11,922
    mcowan77 wrote:
    Cant get it any tighter

    Too much can be as bad as not enough. Wind out the limit screws and see if that has any affect.
    I've added a signature to prove it is still possible.
  • The Mechanic
    The Mechanic Posts: 1,277
    If things were working ok before you replaced the cable, there is a good chance that you have the cable clamped incorrectly. Have a look at the Tech Docs section on the Shimano website for the correct way to route the cable over the mech clamp.
    I have only two things to say to that; Bo***cks
  • mcowan77
    mcowan77 Posts: 560
    It wasnt working prior to the cable change
  • zx6man
    zx6man Posts: 1,092
    unless the shifter itself is goosed...
  • g00se
    g00se Posts: 2,221
    My guess is that the lever wasn't in the lowest position when you set it for the granny ring.
  • mcowan77
    mcowan77 Posts: 560
    I've clicked right back to the lowest position , installed the cable and pulled the cable tight and secured it.... Still no joy
  • desweller
    desweller Posts: 5,175
    Top limit screw?
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    On Strava.{/url}
  • Monty Dog
    Monty Dog Posts: 20,614
    Disconnect the cable and try to move the mech by hand - does it have the full range of movement? If not, adjust the stop screws, reconnect cables and try again.
    Make mine an Italian, with Campagnolo on the side..
  • mcowan77
    mcowan77 Posts: 560
    Thanks folks

    I'll give it a bash tomorrow
  • mcowan77
    mcowan77 Posts: 560
    Still no joy... It's moving freely when the cable is disconnected... Possibly mis aligned?
  • desweller
    desweller Posts: 5,175
    Top limit screw??
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    On Strava.{/url}
  • onbike 1939
    onbike 1939 Posts: 708
    I would doubt the "H" screw is the problem if it hasn't been touched. Better to start from the beginning and follow the instructions here:
    http://www.parktool.com/blog/repair-hel ... djustments
  • desweller
    desweller Posts: 5,175
    onbike 1939 wrote:
    I would doubt the "H" screw is the problem if it hasn't been touched. Better to start from the beginning and follow the instructions here:
    http://www.parktool.com/blog/repair-hel ... djustments

    It wasn't working even before the cable was changed, so the top limit screw could well be wrong.
    - - - - - - - - - -
    On Strava.{/url}
  • mcowan77
    mcowan77 Posts: 560
    Update- got a new front mech... Now working, the spring was done on the old 1
  • onbike 1939
    onbike 1939 Posts: 708
    mcowan77 wrote:
    Update- got a new front mech... Now working, the spring was done on the old 1

    That's good but again the spring is a "return" i.e. it returns the FD to the small ring and would not affect upward shifting which was your reported fault.
  • cpeachey
    cpeachey Posts: 1,057
    This can be a problem if the outer ring is smaller than the groupset originally was designed for.
    Try raising the changer up.
    Chris

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