I'm sure there are others out there that do this, but I don't recall seeing it posted before. This may help some new tractor owners.
I only mow 7 or 8 times each year. It all goes dormant during the hottest part of the summer, and although it greens again in the fall, it doesn't grow much then. I only mow once in the fall. Between mowings, I use the tractor for other things. So I take my mowing deck off each time and then put it on as I need it. If the front loader is on the tractor, I use it to lift the deck to put it on the storage dolly. I know some people lift it to move it to a storage area. I'm envious of the big tractor barns that some people have. I'm impressed when someone has a barn big enough to drive off the deck and just leave it there. I have tight storage in my garage and having the deck on a dolly works best for me.
But I don't mow with the FEL on and so usually when I'm uninstalling the deck, the FEL isn't on the tractor. It takes a lot of time to put the FEL on the tractor just to lift the deck onto its dolly, and I may not need the FEL for the next job coming up. So I needed a simple way to lift the deck using the 3-pt hitch. This method can also be used to move the deck directly to storage.
When I uninstall the MMM, I put it on a pad to keep from scratching paint off the bottom. The day I took these photos, I was trying to remove the deck and we had 40 mph wind gusts. Before I drove the tractor onto the pad, we were having a hard time keeping the pad in place. So we did this with a combination of tractor weights, duct tape, and a neighbor. We still lost part of it several times and had to try again.
To use the 3-pt hitch for lifting, I've found it easiest if I put a draw bar in the hitch. Then I just run adjustable straps over this bar and to the connection points on the MMM. I've also used the top of the hitch for the straps, but the levers there are just a little sharp and I don't use this method if there will be sideways pull on the straps. If you don't have a draw bar, you can buy strap protectors on Amazon and use the top of the hitch.
The 3-pt easily lifts the deck high enough to get a dolly underneath it or to move it to another location with the tractor.
I put eye-bolts on the corners of my MMM to make this really easy, but you can hook onto any part of the deck, including the deck edge.
There is plenty of clearance under the deck for a dolly. In this photo, the 3-pt is not all the way up.
Here are a couple of photos of the dolly that I use for my MMM: