You have a wonderful day. Best wishes. Deas Plant.
Hi, Michael Cremonini.
If my memory serves me right, the 500 was a gas crawler and, like most of the IH agricultural crawlers, was a fairly reliable machine. You can find far more informed people over at Redpower:
http://www.redpowermagazine.com/forums/index.php
At $2,500, that little jigger sounds like a reasonable buy, especially if it is in as good a condition as you describe. Wide gauge, 3PTL and a PTO are all bonuses.
Here is a photo of what I think is a similar tractor with a dozer fitted.
http://www.redpowermagazine.com/forums/index.php?act=attach&type=post&id=66848
Happy hunting.