I have a MX5050 timecutter. My daughter was using it and hit a rut. It knocked the deck off of the hook. They got it back on, but something isn't right. It did not cut even and I got that adjusted, but the deck still isn't right. The right hand scalping wheel is about 1/8" from the front tire. I don't want to make it worse, any heads up on adjustments. I did not see anything on you tube.
Have a look at the 3/4" round bar that the rear deck hangers hang off.
IT should sit inside a little bush under the rails on both sides oft the mower.
If you hit something really hard with the deck, that bar pops out of the bushing , yes the 3/4" bar flexes & pops out.
If you find this then you will have to remove the deck ,
undo the bush on both sides so you can turn it 4 deg across the frame to get enough space to get bushes back on both ends then bolt the bushes back into position.
Bert hit it on the head, telling you to look at the lift brackets, making sure that they are both on the rear lift arm. Also check the two bushing which attach the lift arm to the frame. They may have broken.