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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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