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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