Yes, it is very easy if you are detail oriented.
First question, is have you check pressures, both standby, and operating? Does this pressure fluctuate back and forth from standby to operating, while in operating mode? It may not be the pump, the pump may be being commanded via the sensing circuit to rapidly fluctuate pressures and flow, because of some problem elsewhere.
Do a flow test, and see if you really are getting air, (foamy oil) or just fluctuating pressures.
If you are really getting air, the first thing I would check/due, is put new o-rings on the back side of the swash plate trunnion bearing covers (about 1-1/2" inset round covers opposite sides of the pump) If those get loose, as I have seen them due, they pull air in from there. If you clean things up real well, you can do this easy repair right on the tractor
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