check out the picture on case ih website. there's a $15 gasket and 4 o rings you might as well replace while you're in there. the pump is bolted to that cover with a spacer in between. so you leave the 4 bolts in the middle, pull the whole thing out, then change out the pump.
from your original post it sounds like it will lift header all the way, just not fast enough. if you start with the header all the way down, does it start to lift faster, then slow down when it takes the weight off the ground? that might indicate a slightly worn pump, as leakage increases (and pump output decreases) with increased pressure. if not, it sounds like you've got a restriction somewhere.
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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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