The ''bar'' you have put on the tractor drawbar needs to be more rearward so the second chain will limit the main frame of the mower from dropping lower than a certain height (I can't remember the ''spec'', but it's in the O.M.).
Did you re-locate the ''shaft'', Key #10, in the drawing below, frame the LH hole in the main frame to the RH hole as well as swapping the lift components?
If those items have been done, the O.M. covers the setting up of the chains you asked about, very well (as I recall).
One setting controls spring tension which makes the tractor carry most of the weight of the mower, taking weight off of the ''shoes''.
The length of the other chain controls how the outer shoe lifts first, when raising the mower.
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