Here you go:

www.acmoc.org/bb/showthread.php?28065-D2...eck-my-understanding

First order of business for the steering is to take the tractor into a large enough field that you can do number eights in it. To accomplish that, hook another tractor to the rear of the D2 and you can use that to "steer" the D2 around the field.
What you do is tie both steering clutch levers back and then drive around riding the brakes as hard as you can without actually killing the machine - using a low gear will help this. The goal is to get the brakes as hot as possible (like smoke literally pouring out of them) in the hope that it will expand the combined brake / clutch drum enough to get some movement, and also cook the steering discs enough to get them to start to loosen.
Once you have any movement, even if the clutches are still stuck, you can then just keep working the clutch levers, driving forwards and backwards, etc. to magnify the movement.

Also, after cooking and letting it cool back down to say, still warm, pour a mix of ATF and acetone into each clutch compartment, up to but ideally not above the level of the shaft, and then run the machine back and forwards to wet all of the clutch discs. Then just go at it occasionally.

Success rate really depends on how stuck it is, how expanded the linings are (if they're really expanded, then you cannot effectively tie the levers back because the mechanism is already "back"), other factors that are hard to control.

Your final option of course is just to disassemble and fix. That's what I did to both sides. The upside of that is that my steering is now brand new and perfect, and with the improved bronze linings from General Gear, much less likely to stick in future