Yay! This is my first time to be the first to say....GET A BOOK!!!!! Okay, now that that is done, a little to chew on while waiting for your new shop manual to arrive, by the way, the deere shop manual is much spendier than the IT manual, but the hydraulic section is also much better, worth the money I would say.
First off, your pump will not be sucking air, as there is no "suction" side of the closed center piston pump, it is supplied by pressurized oil from a transmission driven charge pump at between 50 and 130 PSI. Your front end loader will require more pressure to perform up to par than steering, brakes and such, so lack of performance will be more noticable, and the steering and brakes are protected by a priority valve, so if the pressure or flow is weak, it will all go to those circuits before accesory hydraulics (the loader).
It coud be your new pump is not adjusted correctly, there is a process for checking the stroke valve adjustment (in the handy book....) or you could have a valve problem in your loader, or many other things.
First thing to do is get a book, then check line pressure, then check your charge pump pressure and flow, establish that both pumps are working well, then check for leaks or problems in the system.
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