If the system has enough capacity to hold the liquid refrigerant between the compressor and the restriction it is quite possible for the high side pressure not to go high but instead to remain low.
Shortly after the IH 86 series tractors came out they had a problem with a screen in the expansion valve becoming plugged. When that happened if you installed the gauges and turned on the AC the high side pressure would go up a little and then drop back down while the low side would drop into a vacuum. All the refrigerant would end up in the condenser, the receiver dryer tank, and high pressure lines. Since there was no circulation the refrigerant did not pick up any heat so the fan pulling air through the condenser kept it at ambient temperature.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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