After a few minutes of riding it “shakes” itself to this position
It doesn’t feel totally unengaged when it drops but I feel it should always stay in the on position. I tightened the tension but it doesn’t seem to help. I overtightened it (all the way actually) just to see if it made a difference and it does not. When it moves to the middle position there is still some tension on the derailleur but not as much as if it is on but more than if it is off. Kind of halfway tension when the switch is halfway. My concern is that its vibrating itself to this halfway position
not yet. It was Sunday when I posted this so they were closed. I was just looking to see if it was a simple fix that I could do myself while I was working on a few other things
In order to properly service a Shimano clutch, the entire derailleur cage has to be unwound and removed. Basically the entire thing needs to be disassembled, cleaned and inspected, greased PROPERLY and then put together in the reverse order. See link for detailed instructions.
Sounds to me like the clutch or cam unit aren’t installed properly. It’s easy enough to put them in wrong. I did that once and had the symptoms you describe.
That’s a pretty involved process. I’ve not had to go that deep yet. Just taking out the clutch and cam unit, cleaning and re-greasing per the Shimano Dealer’s Manual has fixed any issues I’ve encountered. I’ll have to remember this if the easy method fails me in the future.
