Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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Just one question- is it pulling cable, but letting it back down?
IF so, just blast the heck out of it with WD-40 or similar. Let it sit an hour and repeat.
I was able to resurrect the front shifter on my 91 820 antelope that way.
After flushing, when you shift, push the lever as far as you can, and then ease it back down SLOWLY. Once the pawl catches, progress will be rapid. It may take a couple more "flush" cycles.
If that doesn't work, it's replacement time.