Derailleur not tensioning chain?

ali266
ali266 Posts: 41
edited May 2014 in MTB workshop & tech
Hi, the other day I took my bike down to go for a ride and noticed that the chain was slack. After further inspection I discovered that the derailleur cage wasn't springing back to take up the slack. Are there any ways to fix this or do I need a new derailleur?
(Its a shimano deore derailleur?

Comments

  • Chunkers1980
    Chunkers1980 Posts: 8,035
    Exact model? Number?

    But as far as I'm aware, no. - New mech.
  • ali266
    ali266 Posts: 41
    Chunkers1980 wrote:
    Exact model? Number?

    But as far as I'm aware, no. - New mech.
    Shimano Deore M592
  • Chunkers1980
    Chunkers1980 Posts: 8,035
    Perhaps you can undo 1. here:

    http://techdocs.shimano.com/media/techd ... 670748.pdf

    And hook back in the spring
  • njee20
    njee20 Posts: 9,613
    But as far as I'm aware, no. - New mech.

    You're not overly aware then!

    As you say in your link - you can undo the b-axle assembly. Remove the mech, usually a circlip on the back of the bolt, then the spring will come out. Clean it all up, flush with GT85, grease and reassamble. A bit of a 3-hand job as you need to then rotate the spring, so it's 'engaged' before you refit the circlip. Weirdly had to do it on the Dura Ace mech on my road bike yesterday which had gone stiff, took about 20 minutes including a decent clean of the mech and fitting new jockey wheels.

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