Most of the older grinders came with a lube that had a high paraffin content and were nearly packed full at the factory And would outlast 3 sets of carbon brushes and at least 1 complete motor rewind.
new grinders today have a much thinner grease in them and I've had some that would wear out before the first set of brushes
If you are filling the cavity with new grease try to choose one that has a high melting point and at the same time will readily yield to be drawn between moving parts,
I like a grease with either molybdenum disulfide or lithium hydroxide and paraffin as the thickener.
By the way addition to my previous post when it comes to the amperage draw those figures were for 120vac for 230/240 vac the numbers would be halved
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