Now vet, you just poured cold water onto a theory a whole lot of guys have believed in for years. I'm with you. I used to even put a bead of 515 sealant just around that o-ring to be darn sure it could not suck air. Can't say it ever changed the way hydraulic systems acted. I believe the real culprit lies in the area of the seal to the rear pump. That gear driving the pump foams the oil up right around that seal and a good share of those seals are loose on the tube and even damaged installing. Having more oil reduces the exposure of that seal. You get an air pocked in the top of the filter cavity in rear housing and that mcv pump gets ahold of it. When IH came with the pfc closed center system, I had to run around the country installing that goofy little do flicky that is behind the filter retainer on all the tractors we had sold with pfc hydraulics. They never explained the reasoning at the time but I understand it was so the mcv pump would get any charge of air in that pocket and not the pfc pump as air would destroy that pump real quick. One other spot, the o-ring on the main suction tube into filter housing. Rarely do they get replaced. First I heard of the extra 5 gal was to have ring gear dipping into that oil for better lubrication. It sure does not hurt anything from what I have seen but all the tractors I service run on the full mark, not 5 over. Not saying some can't suck air from bad o-ring between split because some gaskets do not surround o ring , just saying, it is not as prevelant as some think.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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