Setting up a buhler tiller

[tractor ron]

I have a 5' tiller and I am using it for the first time. this is probably a dumb question but: there are three sets of holes to attach the training arms off the tractor. which ones are used to till the deepest: the upper holes or the lower holes?

 

[willchance]

filling tractor with 134a freon

how much Freon do you put a cab tractor if it is completely out ?