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Front derailleur "sticky" ?

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Front derailleur "sticky" ?

Old 09-17-13, 02:36 PM
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Blind
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Front derailleur "sticky" ?

I'm having trouble getting my FD to drop into the smaller ring when I first start riding, but after a few tries it will slowly start shifting back and forth as normal.

If I command the small ring, and I stop pedaling and 'kick' the FD inwards, it moves in as normal and shifts fine.

I've tried spraying the whole FD down with degreaser and sprayed some teflon lube at all the joints with no effect...suggestions?

All Shimano 7700 9-speed dura-ace parts

It shifted great about 1000 miles ago
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Old 09-17-13, 02:43 PM
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The cable and housing need to be cleaned or, better, replaced. They are almost certainly the source of your problem.
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Old 09-17-13, 02:55 PM
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The cable is going full slack like normal when I command the small ring, it only needs cable tension to go to the big ring which is working fine.
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Old 09-17-13, 02:56 PM
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Try cleaning cable guide under the BB.
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Old 09-17-13, 03:21 PM
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Shoot the shifter full of WD40 and replace the cables and cable housings.
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Old 09-17-13, 03:22 PM
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Originally Posted by Blind View Post
The cable is going full slack like normal when I command the small ring, it only needs cable tension to go to the big ring which is working fine.
Which implies the cable is sticky or the fd's spring is broken.
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Old 09-17-13, 03:29 PM
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Originally Posted by HillRider View Post
Which implies the cable is sticky or the fd's spring is broken.
Both of my mountain bikes FD cables go slack when I command the smaller rings and they shift up/down perfectly fine? The cable isn't used to *pull* the fd inward to get to the smaller ring, the tension is simply pulled off the cable so the FD can pull itself back inward.

It's acting to me like the FD is gunked up, which is why I sprayed it down with degreaser, I have a feeling that if I fully remove the cable and have the FD on the big ring, that the FD wouldn't pull into the small ring without being pushed in either, completely eliminating the cable and housing from the equation.

I will probably just end up pulling the FD off and soaking in some alcohol or something, I was hoping there would be some simple trick to ID the exact spot where this is gumming up with it on the bike still.
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Old 09-17-13, 03:37 PM
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What happens if you put the FD onto the large ring and loosen the cable lock screw?? Does the derailleur just sit there or does it move to the small ring??
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Old 09-17-13, 03:49 PM
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Like gj above i wonder if the ft der pivots are gunked up. Loose the cable and shift with your hand. What happens? loose the chain and move the der with your hand, what happens? You should see the ft der move through out it's range (what ever that is, limited with the screws) freely and without hesitation. If not then the pivots are not freely moving, the return spring is broken of the inward movement need is beyond the der's range. If the der moves properly then the next step is to look at the cable run. As others have said is the cable seeing friction on it's routing at the BB shell or the path from the DT to the shifters? Internal routing hides problems and makes cures harder. Lastly is the shifter. This can be checked by pulling slightly on a cable installed and working through the shifter's index steps. After you've exhausted this then bring the bike to your LBS. Andy.
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