Mowing John Deere 650

[tractorstuff]

I have a John Deere 650 tractor,and when I move the rockshaft lever the rear left for the scraper blade goes up and down works fine but the deck doesnt move
I have the two conector links adj. to the 24 3/8 it says in the manual and still the deck doesnt move.The oil is fine.
Im at a lost can anybody HELP.
thanks
Jeff