Is there a FAQ somewhere on this site which helps buyers with what to look for when considering purchasing a JD crawler for the first time? I've searched multiple times, but haven't found anything yet. If it exists, could someone point me in the right direction? Thanks.
I keep leaning towards a MC. Are there specific things I should look for when considering purchasing an MC? I'm a fairly good auto mechanic, so I understand engines and gearboxes, but I know nothing about crawlers. Except that I'd really like to have one!

Somewhere on this site I think I read about when shopping for a crawler, shop for the undercarriage first. That makes sense to me, but how do I know when I'm looking at a good undercarriage vs. a bad undercarriage? I'm comfortable looking at an old truck and making that determination, but I have no experience with the unique crawler parts.
Sorry for the beginner questions, I just don't want to buy my first JD crawler and then later say "If only I had known then what I know now..."
Any advice or opinions would be greatly appreciated.
Thanks,
mike bennett