It is an Allis Chalmers dozer built in 1948 some time, It has a detroit 271 engine in the machine. It was the most popular machine that Allis Chalmers ever built. It weighs about 12000 lbs, and had a pull weight of 10400.
It is a very capable machine, the engine is easily rebuildable and can be done by any detroit shop.
There are several guys I know of that have a wide variety of good used parts for this machine. They have been restoring them for years and so I help them sell off what they have left over that is good.
I have two Allis Chamlers HD9 and HD9X from this era. I really like the machines and they are fun to operater.
Easy machine to work on.
I would probably would trade my two HD9's for a 5 just because the size is just what I want.
Got any questions give me some email or what ever.
I also to Old IH TD9's