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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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