The support arms need to be parallel. To remove the mower deck, just release the spring loaded pins at the rear of the deck. The deck will slide foreword releasing belt tension. No need to remove the belt first. I have a different mower deck. I find it easiest to jack up the front of the tractor using an automotive floor jack and a block of wood for clearance to allow the deck to slide out the side.
Removing the deck support frame and placing on a flat surface may show if any of the deck support points are misaligned. Post more pictures, we're here to help.
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