3. undo the cable at your front derailleur and check the head of the cable at the shifter to see if it is fraying
4. if so, replace the cable and see if that resolves the issue.
5. if not, clean the internals of the shifter with a spray degreaser. There is a little cover that can be removed from the bottom of the lever to expose the shifting internals in the body of the shifter. [It’s part number 11 in this diagram, held in by a single screw](https://si.shimano.com/en/pdfs/ev/ST-R7000-4340/EV-ST-R7000-4340A.pdf). WD-40 works, as will a bunch of other spray lubes. Basically all you’re trying to do is flush the system to remove dirt that might be causing the pawls to skip.
6. operate both shift levers several times as you spray the internals to help the liquid work it’s way inside. This will be messy. Wear gloves and have some rags handy.
7. With a shift cable installed, see if the shifting has been restored.
8. If this worked, and you didn’t use a spray lube to flush the lever, you’ll need to add lube like tri-flow to the mechanism before sealing it up.
8. If this did not work, it’s likely that part of the mechanism has broken. Unfortunately these are not considered serviceable by Shimano, and things like the tiny delicate springs are not available for purchase. It’s also very fiddly and time consuming work to replace any part in the mechanism. If you can see visible damage to the mechanism it’s often the case that you just need to buy a new lever, but first check if your lever is still under warranty and try to get it replaced for free if it is.
ProbablyNotDave on
I think I found the issue, but I have no idea how to fix it. This pawl will not engage. It seems very loose and just swings around.
2 Comments
1. stop forcing the shifter like that
2. press the small paddle several times
3. undo the cable at your front derailleur and check the head of the cable at the shifter to see if it is fraying
4. if so, replace the cable and see if that resolves the issue.
5. if not, clean the internals of the shifter with a spray degreaser. There is a little cover that can be removed from the bottom of the lever to expose the shifting internals in the body of the shifter. [It’s part number 11 in this diagram, held in by a single screw](https://si.shimano.com/en/pdfs/ev/ST-R7000-4340/EV-ST-R7000-4340A.pdf). WD-40 works, as will a bunch of other spray lubes. Basically all you’re trying to do is flush the system to remove dirt that might be causing the pawls to skip.
6. operate both shift levers several times as you spray the internals to help the liquid work it’s way inside. This will be messy. Wear gloves and have some rags handy.
7. With a shift cable installed, see if the shifting has been restored.
8. If this worked, and you didn’t use a spray lube to flush the lever, you’ll need to add lube like tri-flow to the mechanism before sealing it up.
8. If this did not work, it’s likely that part of the mechanism has broken. Unfortunately these are not considered serviceable by Shimano, and things like the tiny delicate springs are not available for purchase. It’s also very fiddly and time consuming work to replace any part in the mechanism. If you can see visible damage to the mechanism it’s often the case that you just need to buy a new lever, but first check if your lever is still under warranty and try to get it replaced for free if it is.
I think I found the issue, but I have no idea how to fix it. This pawl will not engage. It seems very loose and just swings around.
[image](https://imgur.com/a/WrEHveZ)