found the problem in the servo. something was wrong with the check valve which
stopped the vacuum from entering the bellows. I had cleaned it when I rebuilt
the servo because the check valve was not checking. it was a straight through
tube. I soaked it in kerosene and blew it out and I could hear the valve
rattle. it never entered my mind to check to see which way it was checking.
yesterday I put the vacuum hose on the valve and it immediately shut off the
vacuum to the unit. after deducing that this was not the way it should be
working, I took a drill and drilled out the check valve, which appeared to be
some kind of rubber and a spring. anyway, the servo operates correctly now.
now to find a properly operating check valve.
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