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Once worked on a '41 hand start. Original owner hated the tractor because he had always had troubles with it. Fan shaft bearings had been replaced multiple times in the life of the tractor. Chronic mag troubles. Governor bearings went bad repeatedly. He switche to a different paint scheme (IH) and quit taking care of the A using it only as a last resort. Turned out that there never was a hole drilled through the oil pressure gauge port into the right hand bearing's space. The governor housing was defective from the factory. This hole is as the other guys said very small & I just assumed the drill bit broke off & this governor (and maybe some otehrs) was missed during inspections at the factory. The oil is SUPPOSED to enter the area to the RIGHT of the right hand bearing but to the LEFT of the magneto drive coupling. The RIGHT bearing floats in the governor case bore but is under the pressure of a stout spring constantly pushing the entire bearing and shaft towards the left side of the tractor. Oil has to run through the rolling balls of the right governor bearing to get back to the crank case and will do so before it runs out past the drive coupling. The spring is wound to help 'pump' or auger the oil towards the bearing and away from the drive coupling. As oil runs through the bearing, centrifugal force slings it around in the governor housing splattering over the bevel gears. There is a passsageway in the rear fan shaft bearing housing designed to catch some of this flying oil and make it dribble down in FRONT of the rear fan shaft bearing. This oil has to run through the rear fan shaft bearing to get back to the crank case. It too flys 'round inside the governor & helps oil the bevel gears. The left governor bearing receives its oil in much this same manner but from the oil pumped up from the left main via the camshaft drive gear and other oil flying 'round in the crank case. The top of the left governor bearing housing has a funnel type of opening designed to use gravity to route the oil it catches through the balls of the left bearing. This funnel shaped housing is very plainly visible on the outside of the bearing housing. Particularly so on the late B's. As long as oil is pumped by the gears and/or the oil pump and the speed is there to sling it, gravity does the rest. Tried to fix the above tractor by drilling the hole. Didn't work. The right governor bearing had worn the bore of the housing enough that we could not keep the mag drive coupling nut tight because of shaft wobble and it was noisy. Bought a different housing & transferred the parts to the replacement housing, heeled & lashed the bevel gears and the troubles went away. Good luck with yours. Later.
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