Bud, that's something I never encountered. I wonder how they made it that tight, and if any surplus grease couldn't get out on its own, whether there were any air pockets in there. I'm still learning.
Got tractor? Got grease? If you question it needs grease, it does. One pump is 100% better than zero. If you can't grease on your hands from your MMM or tractor you really need to get the grease gun out again.
Grease is the life of the MMM, as oil is for your engine.