I think you have it pegged, George. Locked rotor (startup) ranges 3 to 10 times run current and the 13500 just about covers it, but 5500 doesn't. Also, I would add that the unloader function is "barely there" when it is working. It closes before motor shaft moves and leaves compressor partially unloaded for whatever partial revolution (we could argue about partial vs more, but I wont) is needed in the way of compressor output to fill and pressurize probably less than a foot of line between unloader/check valve and the compressor head. Like I said, "barely there".
BTDT. Built a small (approx quart or two) tank & inserted it between compressor & unloader/check. This made compressor start off generator, where w/o tank, it would not, because now, it actually remained 'unloaded' long enough to get up to speed on the marginal generator.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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