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There are some similar issues with other STI levers. I wonder if they're the same as what you're experiencing.
My issue was with a few 6700 & 7900 levers not engaging on the up shifts.There are a couple of similar threads to this:
https://www.lfgss.com/conversations/358022/I think your problem might be deeper than that exploded view goes (inside the ratcheting part of the chonky top part of 'main lever assembly')
psg1ben-
I think your problem might be deeper than that exploded view goes (inside the ratcheting part of the chonky top part of 'main lever assembly')
Yeah, I'm a bit stumped as to how I can access any of the actual mechanism. I'm picking up a groupset later off a mate, but figured I'd at least have a look as my brother is coming tonight and we were hoping to get out riding - so fixing the current shifter is preferable to switching over half the groupset.
It feels like one of the teeth has probably worn off, as I have clicks up and down on the two largest rings at the back, but I can't shift down beyond them. The shifters have had a long life, so can't complain too much, but it is a bit annoying to not even be able to get to the mechanism properly.
Found this:
https://www.youtube.com/watch?v=4PDGHoUZ38M
But it looks a bit beyond what I can be arsed with right now. Lots of springs and bits that are likely to be a total faff to get back together for potentially no gain.
Nef
Ultegra 6510 9 speed shifter no longer shifting down - doesn't seem to be engaging. So I can push the lever to the side, but it doesn't feel like it's "catching" the mechanism.
Youtube said try spraying some WD 40 in, so I tried the GT85 I had to hand (which then dripped on the rim and I had a nice faff on to clean it all off). Regardless, it still doesn't work.
https://si.shimano.com/pdfs/ev/EV-ST-6510-1950A.pdf
Is there a meaningful way to get in to have a look? I've removed screw #5, and I can remove the nut that's on the same rod as #5 thread into. Will that allow further disassembly, or do I need to remove #9 and #10?