Here's some INFO I located on the "YT" archives: May be of Interest to you Joel? I have NO idea of the below info's accuracy. Bob....
INFO From the "YT" archives:
Brent, Yes, it is a JD factory live hydraulic pump. A few parts are still available. There's a page in the A,B,&G parts catalogs that shows the pump. The working pressure is about 600 psi and you can use a modern cylinder with it depending on how much weight you want to lift. The seal on the mag end is p/n AH21815 @$14.50. This a double lip seal. The seal on the governor end is AA5613R @$8.40. This is a single lip seal and you'll need 2 of them since the original was a double lip seal.
Before you put any $ in parts, take the pump off and open it up. The most common problem with these pumps not working is the pump clutch collar. The notches in the collar are worn and the collar will not stay engaged with the pump drive shaft. The two cogs on the drive shaft get worn too. The problem is caused by engaging the pump when the engine is running. The collar (p/n A4762R) is still available from Deere @ $150. The drive shaft (p/n AA5612R) is no longer available.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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