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-   -   RSX STI slow return mech (https://www.bikeforums.net/bicycle-mechanics/1137890-rsx-sti-slow-return-mech.html)

206Moser 03-09-18 08:58 PM

RSX STI slow return mech
 
Hi all,

Assembled, my right side / rear 7-speed RSX STI lever is able to shift up into my climbing cogs. The larger lever however will not return to its starting position. It stays stuck, pointing at the front wheel. Shifting down, itís obvious the pawl is not engaging the gear tooth.

Iíve disassembled and reassembled the brifter several times. It is clean, none of the original grease is present to funk up the mech. I cleaned the mech and re-lubricated with tri-Flo to be safe.

Hereís the rub: the downshifting mech works fine with the lever disassembled. Very well even. Also, there upshift lever springs back into place. Once I reassemble, and in particular, once I reset the headface bolt, I experience the same problem as before, with the downshifting pawl not engaging the gear and the upshifting lever not springing back into position.

Is it possible the lever cover is causing friction on pawls and/or mech? There is what sounds like some scraping going on inside the levers once reassembled. It even used a wire brush on a dremel to polish the inside of the mech cover. No change in function once reassembled.

Thanks for any comments.

gsa103 03-10-18 08:08 AM

Have you tried with the cable disconnected? If it's having problems when the cable is connected, it's probably friction in the cables.

cny-bikeman 03-10-18 09:01 AM

+1 Pull on the cable as you shift. If the pawl engages that tells you that cable/housing friction is interfering with operation.

206Moser 03-10-18 09:54 AM


Originally Posted by gsa103 (Post 20214770)
Have you tried with the cable disconnected? If it's having problems when the cable is connected, it's probably friction in the cables.

Thatís a great catch.

Cable in and out, there was no change in the performance.

Most of the testing has been done with no cable, because it appears that tightening the faceplate is the source of the problems.

The lock washer has gone missing from the face plate bolt, do you think that might contribute to the problem?

Should there be a washer or bushing between the face plate and the mech?


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