Question about Shimano Deore LX Mountain Bike Front Derailleur - Top Swing - FD-M580 - IFD
There are several possible problems with your deraileur. The first and most common reason for your derailleur not shiftering back down to the small chainring is a result of a cable and/or housing becoming contaminated or damaged. First check that the cable is not hanging up on something. Next look for any damage to the cable or housing starting at the shifter and working your way back to the derailleur. If the cable/housing is not damaged check to see if it looks rusted or just plan dirty. If any of the above is true it is recommended that you replace the cables or housing. If it is only slightly rusted or dirty looking you can try lubing the cables/housing with something like Tri-Flow. This may get the cable moving again take care of the derailleur problem.
The next most common problem is the result of the derailleur itself needing to be lubed because it is contaminated. It is best to spray the derailleur with GT-85 and work the derailleur back and forth manually until it is moving freely. Make sure you have the shifter shifter into 1st gear so it can move when you begin working on it.
These are the two most commong problems with a front derailleur not shifting back down unless the derailleur has been damaged in a crash or adjusted incorrectly. I gather that the derailleur was working and then it stopped so it is not the result of damage or incorrect adjustment.
If you need any more advise or help with the cable installation process you can contact me at firstname.lastname@example.org.
Hope this helps. Thank you
Posted on Jul 18, 2009
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Posted on Jan 02, 2017
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