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View of the derailleur cable

I am having a problem with my rear derailleur. I installed as per instructions, adjusting the H and L limits to what I believe is proper. The problem I am having is that when I am in 7th gear, shifting down doesn't actually shift. The cable tightens, but it just pulls the derailleur back instead of sideways along to the next gear. I have tried both tightening and loosening the cable in various amounts. I also noticed that I can push the derailleur from side to side (as if it were changing gears) while the cable remains at the same tension.

As this is the first derailleur that I have installed myself, I really have no idea whats wrong. Did I install it wrong? Is it broken? I'd appreciate any help.

EDIT Added a newer video that hopefully shows the problem better.

Here's a video of the problem

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  • you have something hooked up wrong, but a small, dimly lit video isn't enough to say what. Can you take a couple of clear photos of where the cable attaches to the derailleur please?
    – Móż
    Nov 12, 2015 at 3:28
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    I've added an image of the rear derailleur. The cable goes into the housing, around the pulley, through the second guide, and into the lock bolt. Let me know if you need more photos, and thanks for the help!
    – Patrick Latcham
    Nov 12, 2015 at 4:31
  • Is the cable housing there (between the chain stay cable guide / stop and the derailer? I think I see it, but it is hard to be positive.
    – dlu
    Nov 12, 2015 at 5:52
  • (note that the bike is upside down in that photo)
    – Móż
    Nov 12, 2015 at 6:23
  • The cable housing is on the cable between the derailleur and the cable guide on the bike frame. Is that the part you meant, dlu?
    – Patrick Latcham
    Nov 12, 2015 at 9:40

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Thanks for all the help! I had a friend take a look at it in person. Turn out the cable housing between the frame and the derailleur was too short. The derailleur was cocking back until it caught the cable housing, then working as normal. After a replacement with longer housing, the bike is now working perfectly.

Thanks again to all who helped!

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