A hydraulic pump should not be making any noise you could hear over the engine noise. Does it have a built in relief valve?? If it does then you may need to set the out put pressure up if it is bypassing all of the time. Also your system might have a problem that was not just the old hydraulic pump.
Check and see if anything is getting warm to the touch just setting there running. If there are any hot spots then there is a high pressure internal leak there.
I assume that it is an open center system. Check and see if the return lines/tank are not restricted. Make sure all the control valves are returning to center. I have seen valves that have broken internal springs just return half way and block the oil flow just a little.
If that all checks out then it could just be how it is going to sound but I would check things out first. You don't want to ruin your new pump. There could have been something else wrong that made the old pump fail sooner.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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