Hesston 5580 round baler on farmall 560

I bought a Hesston 5580 round baler to use on my farm with the 560. The owner's manual says it requires a minimum of 45 horsepower of which the 560 has plenty. what I'm having an issue with is it doesn't want to open the door all the way. I thought maybe the pump was going bad. I hooked it up to another tractor a 460 with the same results. I have a hard time believing it wouldn't be able to lift it all the way up. Is it possible to only open the door halfway and maybe roll the door over the Bale? or am I pretty much stuck trying to figure out what to do to get the door open all the way?

Hesston 5580 round baler on farmall 560