I work on them for a friend that runs a fertilizer business. Yours is not the oldest as it does not have a tapered hood/counter weight, 1965-mid to late 1970s. The next thing to tell about is if it has a Hi-Lo lever under the dash. These would be the next generation. Made from around 1980- to around 1990. Then the Orange single speed ones where made between 1990- early 2000s when the Yellow 4500 came out. What generation of Orange wrangler you have does not make much difference as far as engines. They all had JD four cylinder diesel engines or Ford industrial gas motors.
Now the bad news in two ways.
1) When Agco bought Willmar the knowledge of these older Wranglers fell to about zero. The parts books just do not show the differences on the orange one very well. The Computer parts lists are just about useless on the older Willmar stuff. We have some of the old paper parts catalogs and Davis Equipment at Des Moines/Johnston IA, has older fellows in the parts and service departments that KNOW a fair amount about the older machines. A lot of the parts are written in their old paper books.
2) Your Wrangler has had the motor replaced. It is NOT a JD diesel motor. Repowers were not uncommon. It does look like it could be a Ford diesel motor. There was a fellow in Western Iowa that transplanted Isuzu motors in them and they were blue too.
So your going to have to get some numbers off the motor. If your lucky a tag/serial number but if not post some casting numbers.
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