I'm not familiar with Allis's... but I think you have a pressure/flow problem rather than a valve problem. I'd start by checking/cleaning the pickup strainer for the pump that supplies the powershift. Beyond that I'd say you have the makings of a leak. It's just starting so the pump can sort of, almost keep ahead of it yet. Once it gets worse the pump won't keep ahead of the leak anymore. Then you'll see a constant pressure loss on that clutch. I would think that if only one clutch is so far affected, that would be the offender rather than the pump UNLESS there are several different size clutch drums with different fill times/displacements.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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