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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