RR, if you are interested in checking out an alternative to the J-D Corn Head (NLGI 0) grease, I have some excess Chevron Delo EP 00 grease listed in the Parts for Sale forum. The specs are listed in a couple of the posts there. Only issue with the Chevron product is that it comes in a 5 gal (35 #) pail, so I have extra...
I've done as HRL Jerry suggested to get the old grease loosened up. Works well. Good luck with the project!