Had to do a lot of running around in town today, Loree is home sick so had to do some things for her as well. Didn't get out to the shop until 3. Ran the GT5000 in to look at that crooked mowing deck.
I have been using a level on the pulleys. I figured that is more accurate than trying to measure on an oddly shaped deck shell. The left outer spindle shows the same so the deck shell itself shouldn't be twisted.
As you can see it is way the he!! off! Front and left side low.
Before I raised it up with the bridge crane this left front deck wheel got straightened. Had to use a pipe wrench with a cheater. It was toed out from banging into things.
Raised the front up and noticed a sticker on the underside of the left footboard. The same dum@$$ engineer must have figured this sticker location that also designed the deck mounting configuration!
The front mount to adjust the deck isn't too bad to work with.
I think the mount can be pinned into the lower hole, then the nuts adjusted in front accordingly.
Now reaching the side adjusters is where this gets really ridiculous. I will be drawing blood doing that for sure! Two views of the right adjuster.
And a couple views of the left one.

It is possible the link with the "LH" on it is bent. This thing used to mow level when I first revived this tractor from freebie junk. It is mounted so rigidly to the tractor that there is no forgiveness at all when the operator hits something and it is generally the left front deck wheel that hits something. The height difference between deck raised and lowered is only a couple inches.
It's too bad that the deck mounting is so poorly designed when the deck and tractor themselves seem to be very good pieces. Still glad I didn't buy this thing though---LOL!
I did have the deck out from under it not long after I brought it home and remember hoping I would never have to do it again!
Better consult a manual to see if I am missing something to make adjustment a little easier.
DAC