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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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