Ummm....they're not hard to use; but don't track like a 3pt. mounted mower. Can't help much with setup, but will pass along some operating hints.
On your outside turns, let the nearest front wheel of the tractor wander toward the edge of the cut area as you enter the turn and then trace the cut edge with the front wheel as you go through the turn The mower will try to hang towards the inside of the turn. This will bring the mower through the turn without leaving an uncut fringe at the outside of the turn.
When making inside turns, you should nearly double the margin between the cut edge and the nearest front wheel to bring the mower through the turn with a full bite. As before it'll be trying to hang toward the inside of the turn. This works with JD2640 and a Bush Hog 15 footer...dunno about other combinations.
Figure out which way the mower throws it's cuttings; to the left or to the right. The Woods and Bush Hog mowers I'm familiar with, throw most of the cuttings to the left. This means the right hand wing throws its cuttings into the center section, the center section throws into the left hand wing and the cuttings are finally thrown up against the left side of the left hand section. I therefore try go around a field clockwise so the mower will be throwing cuttings away from the grass I will be cutting on the next pass. But this is pretty standard for any bush hog. When the right hand section picks up a rock, you can often hear it transfer from one section to the next before it exits.
The front of the blade arcs should be adjusted a little lower than the rear...maybe a half inch to an inch. This means the leading edge of the arcs will do the cutting. The back edge will be moving above cut grass. You want to avoid a rear low condition as this means the grass is getting cut twice. Again, pretty standard for any bush hog.
Don't raise the wings very far with the PTO running. It's OK to raise them enough to get over a rock or short stump, but don't raise them all the way. The racket from the drive system will let you know when you're over doing it.
First trip around the outside of the field is always the worst. If it's unknown ground and you're expecting the worst, you might want to make your first pass a ways in from the edge, then, with the visibility this gives you, go back and try to hug the edge....but go slow. That outside wing can get in a lot of trouble doing the edge; especially near a woods.
Try to adjust wing and center section height so you can run with wing and height hydraulics in full float (all the way down). This relieves the pressure and stress on the hyd. system and keeps small leaks from developing and gradually draining your reservoir.
FWIW
Bob
P.S. Yeah, I defer to Soundguy on this subject. He's been into batwings alot longer than I have.