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I'm having a hard time figuring this sucker out, deck is sitting too low at the highest cut setting, and i have the lift arms in the holes that should pick it up the highest... pretty much everything is at the highest setting....there seems to be some slack in the lift mechanism.
i did notice there was a bolt and nut in the rod tracks (circled in red), that was slipped to the very end ...i assumed this was some kind of adjuster for height and for how soon the deck begins to lift/lower...but im not seeing that in this diagram. and i really don't see anything else obvious causing the deck to remain low

Everything from bent linkages to wear to the height control lever being bent due to people snagging it on trees when they drive by.