Looking at a JD 440, and I have some questions.

[JLWhite]

If you can turn wrenches and have some ambition and a service manual I would think you would enjoy it..Are you sure it needs rollers and idlers? I cant see it well enough to see that.With all OLD crawlers you have to decide how much you want to use it and if so so parts will get by or if your going to use it a lot and will need a dozer in great condition.Those parts and wear parts like clutches can be had.. but the foundation of it could turn into a money pit if its not good.

I'm just anticipating the worst. I guess all of the adjustments would need to be done before changing parts. Any special tools needed for track adjustments? Does the "turn wrenches" work for steering clutches (if needed), or is that a different source of stress?

[Lavoy]

No, none of it is rocket science, all are easily done for the most part. Yes there a several tricks to doing things, but all that info is available here.
Lavoy