Hesston 1007 mower

Anyone know how to get that top cap off to fill with the ep grease. Mine have really seized on and I can’t figure how to get off. It’s the one with 4 bolts holding it on right under the turtle. Also I was able to get the little square piece off that goes on the splined shaft but looks like a shin or something down in there is out of its groove. Thanks for the help

Hesston 1007 mower