I found the ID Plate on my Cletrac.
It is a 1946 ADH 2Z720.
hercules 4 cylinder diesel still runs
holds 50 psi oil pressure cold and 25 psi worm.
Still charges
We took a blade off a JD 1010 that the engine went bad on.
It has been a great little crawler
Here are some pictures
1946 ADH pictures (http://otclub.clanwebpro.com/images/cletrac/)
Looks like a beauty!