[Duccio]

I need to tune my front derailleur model Shimano FD-M771-D (direct mount).
Going to the smallest front cog the chain falls on the BB and with the biggest front cog and the smallest rear cog the chain is touching the derailleur.
I tried to turn the 2 screws on the derailleur, but I don't have clearly understood which is the Low and the High screw.
Can someone help me for identifying the 2 screws ?
Thanks in advance

 

[RheXtian]

does 2 screw are called limit screws, the low screw limits the movement of the cage of the FD towards the bb while the high screw limits the movement of the cage of the FD from jumping off the largest chaining..

try tightening the low limit screw until the chain wont fall anymore..
then adjust the adjustment barrel of the FD until the cage won't rub anymore..

 

[Duccio]

does 2 screw are called limit screws, the low screw limits the movement of the cage of the FD towards the bb while the high screw limits the movement of the cage of the FD from jumping off the largest chaining..

try tightening the low limit screw until the chain wont fall anymore..
then adjust the adjustment barrel of the FD until the cage won't rub anymore..

Thanks for the suggestion.
But which screw is the Low and whch is the High?
I added a picture. Could you confirm the L and H screws?

 

[rockyuphill]

Low is the top screw and High is the bottom screw.

 

[Duccio]

Low is the top screw and High is the bottom screw.

Thanks a lot!
(I need glasses)