I will assume a 1969-1970 JD 4520. They where the first turboed JD tractor from the factory. They where about 125 PTO HP. They had a real heavy rear end almost like the JD 5020. They did not have the inline injection pump. The early ones had injection pump and injector issues.
There where several of them around here. They where 1000 PTO only that hurt them around here because of the limited use of 1000 PTO implements back when they where new. They where real heavy for the horse power. That made them kind of doggy in the field at factory horse power. Most where turned up to 150-175 HP. The rear end and transmission held up. The clutch was the weak point then.
At factory horse power a JD 4520 was nothing special to use. The later model JD 4320 would out work them at factory settings. It seemed like the extra 10 HP was used in just moving the extra tractor weight around.
The value of JD 4520s has been creeping up. Many guys are wanting them as collector tractors.
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