check out the picture on case ih website. there's a $15 gasket and 4 o rings you might as well replace while you're in there. the pump is bolted to that cover with a spacer in between. so you leave the 4 bolts in the middle, pull the whole thing out, then change out the pump.
from your original post it sounds like it will lift header all the way, just not fast enough. if you start with the header all the way down, does it start to lift faster, then slow down when it takes the weight off the ground? that might indicate a slightly worn pump, as leakage increases (and pump output decreases) with increased pressure. if not, it sounds like you've got a restriction somewhere.
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