Servcing STi Levels

Discussion in 'Cycling Equipment' started by xc_gumby, Jan 3, 2004.

  1. xc_gumby

    xc_gumby New Member

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    Anybody got any ideas about how to clean & lube the mechanism?

    I've got some service diagrams from Shimano but it really doesn't look obvious.

    I've got 1999 105s.....:confused:
     
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  2. boudreaux

    boudreaux New Member

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    Is there a problem or do you just have an itch?
     
  3. xc_gumby

    xc_gumby New Member

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    oh, I've just got an itch!

    I'm just curious about how fanatical people are about maintenance.
     
  4. boudreaux

    boudreaux New Member

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    Best not to mess with them till there is a specific problem.
     
  5. Eidetic

    Eidetic New Member

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    I think I would mess with my RD before I would open up a shifter .... and I have no interest in trying to get an RD back together correctly.
     
  6. xc_gumby

    xc_gumby New Member

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    Cool, though recently I found a guy who DOES rebuild the shimano levers. He trained originally as a watch maker (horologist actually...)
     
  7. froque

    froque New Member

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    Hi,

    I would like also to service my STI, Is there any way to clean and lubricate them without taking them out of the handlebar?

    BR

    froque
     
  8. boudreaux

    boudreaux New Member

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    I wouldn't unless there is a specific problem traceable to the shifters. They come packed with proper grease. Over time, and depending on conditions, they can get crudded up or the grease stiff. They can also go years without needing attention.It's possible to hose them out with a suitable solvent, and relube with a suitable spray. Trying to take them apart gets ugly.
     
  9. Waldo

    Waldo New Member

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    Spray lube is your friend. Shimano STI levers are not, especially when disassembled (particularly if it is needless-it's not a task to be taken lightly).
     
  10. jp111

    jp111 New Member

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    I got sand in my Ultegra levers, and took them apart to clean them out, they never recovered, had to buy new ones. Very tedious undertaking. Also, had problems with my old 105's after oiling them. My LBS said to leave them alone.
     
  11. 65cmFixie

    65cmFixie New Member

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    I might like to find that guy. I have a Dura Ace STI lever that is misbehaving and I'm considering the disassembly route. Symptom: right lever will usually not shift from larger to smaller cog using the small inner lever unless I hold the larger outer lever still. Shifting from smaller to larger cog works fine. The outer and inner levers seem to move together when I try to shift larger to smaller using the inner lever and nothing happens. I have tried cleaning thoroughly with a spray degreaser followed by lube with tri-flow spray. It didn't make a difference. Any thoughts?
     
  12. boudreaux

    boudreaux New Member

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    Look for a loose or missing screw on the upper backside of the levers that holds them together. You don't have to take anything apat to look.
     
  13. 65cmFixie

    65cmFixie New Member

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    Thanks for the input. I see a screw on the upper back of the larger outside lever. The screw is not missing and doesn't seem to be loose. Could something be gummed up in the works here?
     
  14. e_guevara

    e_guevara New Member

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    The levers are connected to a cog with a ratchet mechanism on both sides, which permits the cog to move in one direction only depending on the lever you move. Moving a lever (the outer one for example) disengages the forward pawl to move to the next slot. The reverse pawl slides along the opposite slots, still engaged. Moving the opposite lever does the reverse.

    Moving the inner lever should not cause the outer lever to move. My guess is that there is something wrong (broken(?)) with the ratchet mechanism, esp. for the outer lever. Sorry, just because they're DuraAce shifters doesn't mean they're indestructible :(

    Disassembling those STIs are a real pain, and sadly, Shimano provides neither service instructions replacement parts for the shifter mechanisms.
     
  15. gregk

    gregk New Member

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    As far as I know, Shimano STI levers aren't serviceable. Or rather, they aren't meant to be serviced or taken apart by the average bike mechanic. As for lubrication, a good spray lube called Boeshield T-9 works great on pivot points and general squeaks. It dries clear and isn't messy- I imagine it would work for your particular application.
     
  16. malcomm

    malcomm New Member

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    I've stripped down and reassembled Ultegra and DA sti's.
    The Ultegras took me about 10 hrs to get it back together and the DA took about 4.5 hours. They are quite different inside and real bastards to get back together.

    In short they aren't made to service and you can't get parts anyway. If its stuffed you have to change the entire guts of the lever in one hit.
    However if its stiffening up then the Shimano grease is probably drying out which is a common problem. I flushed mine out with Kerosene which disolved the grease but left the plastic bits intact. Then used CRC 226 liberally squited everywhere inside to re-lube it.
    1000's of kilometers and still working fine.
     
  17. drebro

    drebro New Member

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    I have 105 STI levers from a few years ago, and today they started acting up. The right lever (for the rear derailleur) gets stuck when I shift to a larger cog (the whole brake lever points inward, and down toward my front wheel). I actually have to pull pretty hard to get it to pop back into normal position. I had this happen once before, but I think with the other side, but it did not last. I tried dropping some oil (Pedro's dry lube) in the parts that looked like they might be sticking, but it did not work. Any advice for this?
     
  18. el Ingles

    el Ingles New Member

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    old saying " if it ain´t broke don´t fix it "
    if you have a problem then leave it to the pros - they have to replace it if they b*gger it up for you .
     
  19. drebro

    drebro New Member

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    The screw in the back of my 105 lever (the right one) fell out the other day on a ride. Does that screw do anything? All I notice is that the whole mechanism rattles a little more without the screw.
     
  20. malcomm

    malcomm New Member

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    If its the same as Ultegra, which it most likely is, then the screw is essential for correct shifting. Without it the Ultegra's have very imprecise shifting.
    The screw is available as a spare part.
    I lost one and never had any luck getting anything else to fit so just buy another one.

    cheers
     
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