Are you sure it is not the filter and bypass screen plugged already? You have a center section that is "new" to you and a 17 GPM pump. You may have sucked up debris off of the bottom of the transmission plugging your filters.
Wouldn't hurt to check and confirm that it is not.
Air should work out after a few cycles. Do not hit the ends of your strokes while trying to get the air out. Fuel, (aerated oil) pressure, (1200 psi relief) equals possible burning of the piston seals. Diesel engines can ignite fuel at 400 psi or so.....your hydraulics at 1200 is a bit higher than 400. Have seen this on large excavators, burned seals.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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