Having nothing left to read I dropped in on this Deere site and find the discussion on the bypass on the Roosa Master pump very interesting. IH went to that bypass on the 7 & 806 tractors shortly after their switching to Roosa pumps on 806 tractors. The reason given was to lengthen the life of the fuel filters as a large share of the fuel would then be bypassed through innards of pump housing and back to the primary pump instead of to tank and back through filters. When we started having the elastocast governor ring failures they said take it off to help lower the internal pump temperature and increase life of governor ring. Pumps with bypass had the ball check valve in the bypass along with orfice wire in return fitting on pump. When you took off the bypass you discard the wire orfice and use the new fitting with check ball. The check ball was not a total check so to speak as it had a slight groove in the seat which allowed some flow. The ball did regulate the pressure inside the pump housing and of course affects the automatic advance as well as the charge of the pumping plungers. The 806 primary pressures were set to about 85 psi at rated high idle and I never did check pressure in the case . I don't remember what they claimed the pressure would run but it was under 10psi with every thing working properly. I also repaired a lot of those Roosa Masters in my day.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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