No, they will fill themselves. Fill the trans up full, start the tractor. Then cycle the power steering full left to right until it feels as if it's working normal. Then refill the trans. The fluid has a tendency to have bubbles suspended in it after this process, and you may have to let it sit for an hour or so to let them out, but it will be fine. The only "problem" the air bubbles cause is they make the system whine until they are gone.
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