Question about Shimano Dura Ace Front Derailleur Fd 7800

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Require assembly schematic for shimano dura ace shifter . left shifter lever failed, will not activate the front derailler, disassembled, found nothing broken, require advice regarding proper reassembly and settings. Dura-ace 7800.

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  • 73 Answers

Log onto Shimano.com, it is probably the limit screws (the two screws that limit travel) or you have a faulty ratchet in the lever, try the shimano website anyway they have great tutorial and manual support

Posted on Mar 27, 2010

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Exploded view of parts diagram for shimano tourney st-ef40 shifters for re-assembly?


If you can't find with a search for st-ef40 diagram or on the Shimano site then it does not exist. Although not identical carefully disassembling the other shifter may give you enough insight.

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Shimano 7970 di2 trouble shooting


Disconnect brake cable at brake. Check operation without any cable resistance. If its OK, remove cable from brake lever end. Check lever operation without resistance. Use a bit of sewing machine or light oil to lubricate lever pivot, cable. If no problem found reinstall in opposite order.

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The front derailer on my sram red compact just wont change quick!


Which brand of shifters are you using? A SRAM derailleur won't work with Shimano shifters and vice-versa.

So - first; if you are using SRAM shifters with the Red derailleur - then changing to Shimano will not solve your issue but only make it worse.

If however you have Shimano shifters - then this is a good solution.
The Red derailleur should not shift that poorly with SRAM shifters. It is not the best - but it's not bad. If I had the bike in a repair stand I would be looking carefully at the following after affirming that the shifting system was indeed all SRAM:


  • Derailleur cage height relative to the large chanring - should be a maximum of 2 mm
  • Derailleur cage should be aligned as close to parallel to the rings as possible
  • Derailleur upper and lower limit screws should be adjusted within spec and in order to allow the derailleur to travel the correct amount for ideal shifting
  • Derailleur cable tension should be correct.


Hope this helps... Let me know if you need more.

Oct 28, 2012 | Sram Red

2 Answers

My Shimano 9spd Dura Ace STI lever (right side - rear changer) no longer works. The internal mechanism seems to have worn / broken. Do you know if I can get it repaired, and where (in UK)? (I know it is...


Find a Local Bike Shop on your own. You know where you live and UK is not very specific.

Or do some more diagnosis/research.

Web search "shimano sti shifter repair" (or most other simplified questions) for resources.

Aug 26, 2011 | Shimano Cycling

1 Answer

Can 7800 shifter use with 7900 front derailuer


Any derailluer can be used for the front and the rear should match how many gears it will choose.

Apr 30, 2010 | Shimano Dura Ace Front Derailleur Fd 7800

2 Answers

Shimano st 7900 shifter,left lever apart and how to reassemble


You can download an exploded diagram of the 7900 series STI shifters here:

http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/ST/EV-ST-7900-2874E_v1_m56577569830670749.pdf

You can reassemble them according to this diagram.

May 11, 2009 | Shimano 2008 Dura-Ace BR7800 Rear Road...

1 Answer

Shimano Dura Ace Brake lever chatter


A few suggestions:

Lube/replace your cables and housings. If your housings are getting rusty on the inside, it will prevent the tension in the spring of the calipers from returning the brake levers to "home" position. Also, dura-ace levers have an internal return spring that is prone to breaking or coming off its peg (this can't be repaired without disassembling the lever).

Make sure your calipers are clean and move freely, and have sufficient spring tension to return to "home" position.

Be careful not to get lubricant on the braking surfaces, obviously.

As an experiment, remove the wheel and pinch the calipers together with your hands. Then, check to see how loose the brake lever is.

Mar 26, 2009 | Shimano 2008 Dura-Ace BR7800 Rear Road...

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