Suddenly yesterday, my right shifter, which has been functioning fine since purchased, stopped shifting "down" from big to small chainring. After some experimentation, I discovered that if I hold the outer lever in its normal position with one hand while depressing the inner lever with the other, the shifter will shift. However, if I allow the outer lever to move slightly (as is normal) when pressing on the inner lever, the inner lever becomes stuck and will not move.
Shifter is 9-speed, flight deck compatible. I have disassembled the shifter per Shimano instructions (up to the point where Shimano says "don't go past this point or you won't get it back together again" in an effort to identify cause of problem. Nothing found. Reassembled shifter last night. Problem persists.
The flight deck cable is not a factor causing the problem. The problem is somewhere inside the forward metal housing. Cable tension is not an issue either, as the shifter is off the bike and has no cables connected to it at this time. If I hold the back (black plastic) end motionless, the inner lever will not move unless I also hold the outer lever motionless. If the outer lever is permitted to move when pressing on the inner lever, the inner lever will not move.
Ideas (other than "replace the shifter")?
Shifter is 9-speed, flight deck compatible. I have disassembled the shifter per Shimano instructions (up to the point where Shimano says "don't go past this point or you won't get it back together again" in an effort to identify cause of problem. Nothing found. Reassembled shifter last night. Problem persists.
The flight deck cable is not a factor causing the problem. The problem is somewhere inside the forward metal housing. Cable tension is not an issue either, as the shifter is off the bike and has no cables connected to it at this time. If I hold the back (black plastic) end motionless, the inner lever will not move unless I also hold the outer lever motionless. If the outer lever is permitted to move when pressing on the inner lever, the inner lever will not move.
Ideas (other than "replace the shifter")?