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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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