Low charge would e my first guess, but it would just be a guess without looking at gauges. Most systems are set up to run between 25 and 45 psi on the low side. Compressor would cycle off at 25 and restart at 45. Most systems that are designed for R134a also have a high pressure cutout switch located on the high side line. Pressures can get a bit out of hand on systems running R134a.
There is also the possibility that your compressor is running too fast. If your system is set up for mostly low engine speed operation, when you raise up the engine speed, it could be running too fast resulting in lower pressures on the low side and higher pressures on the high side. Again, without looking at gauge readings, this is also just a guess.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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