1994 D Lincoln Mc Misaligned On Obverse, Not Reverse?

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The presses are hydraulic, and pretty much all hydraulic machinery has grease fittings for the pistons and those have to be greased on a regular basis. How often exactly, as fast as they go I don't know, but I would think at least a couple of times a day. As to how, I've never seen any hydraulic machinery where it was not done manually with a grease gun. That doesn't mean there isn't any, but I've never seen or even heard of any that wasn't. But done manually or automatically doesn't really matter, the pistons have to be greased.
And yes all hydraulic pistons have seals on them, but no seal is perfect and a small amount of grease is always on the part of the piston that becomes exposed. And when it does that a tiny amount sticks to the outside of that seal as the piston moves back into its cylinder. After a time it builds up and with all the vibration from the pistons hammering away at up to 700 times a minute, some of that built up grease can get flung in almost any direction. And if it happens to fall on the dies well then that's how Struck Through Grease coins come to be.