I'll add a couple of things to look into. First, your pressures are WAY OFF. You do not need to go up to over 300 on the high side under ANY circumstances. Low side should run around 25 to 50. Compressor should cycle off at around 22 to 24, high side should run around 300 to 250 depending on ambient temperature. On a cooler day, it may run as low as 175. I suspect due to the poor cooling, you have either air in the system or too much oil in the system. I suggest that you have the system recovered and evacuated. This will pull most of the oil out of it. With dye in the system, you should also look it over with a black light in an indoor environment where the ambient light is well below daylight level. A leak will show up quite obviously. There is more to an A/C system than just having the pressures right.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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