Aw, heck with it, here's the pump, because I thought of 15 different things, now that the coffee has finally hit.
The round intake at the bottom is a FLOATING piece, so that it draws oil from the top of the reserve, rather than drawing the crud off the bottom of the pan. When the tube of the intake (sump) is slid into the pump cover, a cotter pin (which has to be of sufficient heft) goes through the hole in the 'boss' at the left side of the cover, and sits in the 'channel' of the intake's tube, which not only holds it 'captive', but allows it to swing, to sit on top of an oil level that fluctuates based on leaks and/or tilt of the tractor on a hill. If the swing of it is binding, or if the cotter pin fell out and the sump is sitting on the bottom of your pan, that will ALSO mess with your oil pressure.
Also, the four holes on the bottom of the sump could be crusted over with sludge, which could rob you of pressure.
Also, the helical-cut gear at the top of the drive-rod (which engages the camshaft) and the driven-gear at the bottom of that rod are keyed, and if a key sheared, you will also lose oil pressure. Two more things to check. The other gear in the pump body is an idler gear, but make sure it is healthy and spins also.
You can see the relief-piston and spring, and the hole in the boss on the side from which the excess oil goes back into the pan. The next boss up from that (there is another on the other side) is where the bolts go that holds the pump in the block.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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