Two other tid bits, the jug has been stamped with 1027 759. I assume the bolts in the top are valves vs the reed type ones, they have multiple punch marks in them. Not sure if they marked them every time they were serviced or what?
I rolled it over, the hp side pumps ok but the lp side is both blowing and sucking on the discharge. I'll take it apart here soon to see whats sticking.