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Old McDonnell Miller Round Port Model 47-2 maintenance
My steam boiler has a M&M 47-2 LWCO with auto-feeder. I'm doing annual maintenance. The feeder is the older version with the round port. It works fine and has been a very reliable combo.
Removing and cleaning the strainer was obvious, and am now trying to remove the cartridge for cleaning. The manual instructs to use a 13/16" socket, but that apparently applies to the newer cartridges; the nut inside this unit is smaller than that and doesn't look like the manual's drawing. Before forcing the issue and removing it I thought it wise to check; is the cartridge on the older version removable for cleaning? Or should I just leave it alone?
1950's Bryant boiler in a 1-pipe steam system at 7,000 ft in northern NM, where basements are rare.