GX CS4 Owner's Manual?

Thank you for the detailed diagrams. One other question: There's a thin rubber disc the width or slightly larger than the grease pit in the grease pit of the CS4. If it's supposed to be there, how is it positioned? I ask because I don't see it on the diagram and I bought the compressor used.
 
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Here are pi s

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It goes in the bottom of the grease well that is attached to the compressor. The grease should be added on top of it. Mine was wrapped also, I just cleaned all the grease out and placed it as flat as possible before adding more grease.
Thank you! I thought it might be something they put in there to block any grease from getting into the piston during transportation.