Wonder if the check valve between the compressor and the tank is leaking back at higher pressures. A friend 40 years ago tried to put together a compressor from random parts. The check valve was missing from the tank he picked up and he didn't realize he needed one. The first problem he noticed was the motor slowed with each stroke once the pressure reached around 80 lb's and actually stalled the motor at a little over a hundred. It could not restart at cut on pressure. Granted this is an extreme case with no check valve but a leaky one could cause your problem I wound think. Not sure where the check valve is located on yours but if it is easy to get to unhook it at hi pressure unit shut off and do a soap bubble test on the valve.
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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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