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<p>[QUOTE=&quot;GDJMSP, post: 3117789, member: 112&quot;]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&#039;t know, but I would think at least a couple of times a day. As to how, I&#039;ve never seen any hydraulic machinery where it was not done manually with a grease gun. That doesn&#039;t mean there isn&#039;t any, but I&#039;ve never seen or even heard of any that wasn&#039;t.</p><p><br /></p><p>But done manually or automatically doesn&#039;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&#039;s how struck through grease coins come to be.[/QUOTE]</p><p><br /></p>

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