You need to remove the mechanism that lifts your mowing deck. First, make sure the engine is off. I put a furniture dolly underneath the mechanism to catch it. Then disconnect the assembly's drive shaft from the mid PTO spline. Then you will need to remove 4 pins (2 on each side). Before you remove the adjustable hangers on each side, mark them with a permanent marker. I use "RO" for right outside and "LO" for left outside. Also mark the threads in case it turns. You want it to be the same length on each side next year. (I bought the right size nut and I tighten it so the threads can't turn. Sorry, 5 years ago and I can't remember the nut size.) Also, before you remove the hangers, take a photo of them on each side. It will make it easier to get them on right next year. I also mark an "UP" arrow on the assembly itself. When you have it off the tractor, it won't be obvious which is the top.
Keane