This is a deep deck mower
What is important is the height of the blade not the bottom of the deck
The deck sits low because there are no anti scalp wheels
I am not a fan of offset 3 point deck mounting systems as the left lift arm always fractures and needs welding & reinforcing .
There is an adjustment at the front to level the deck
Apart from that unless the lift arm holes have flogged out there is not much you can do
They are designed for small blocks of less than 1/2 acre and in reality a std 1/4 acre suburban block with level ground and grass that gets cut very regularly.