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Zabcikville, TX | Run your engine at 1100-1200. 250 on the high side is a good indicator. A JD mechanic told me once, twice ambient (outside) temp + 40lbs is where he charges to. I trust this guy, he knows his stuff. Now, this is general. NEVER (or at least I don't) open the high side while hooked to a can or the bottle is open. I've seen them explode, it ain't pretty. High side should go up while low side goes down. In my experience (and I went to school for diesel mechanics, A/C included) there is no correlation between high and low pressures. I always look at high side, that's what'll blow lines and cause grief down the road. Matter of fact, we had a JD 8530 not cooling well just a couple weeks ago. I added freon for the first time in 4 years since owning the tractor. Bossman calls and asked "what did you do to the A/C?" It's hot in here! I got un-busy and checked it out. Turns out when I charged it, it was 85 degrees outside. At 95+ degrees, the pressure (high side) got too high and wouldn't let the compressor cycle like it's supposed to. I let some out, checking gauges all the while, and voila!!!!!!! It started cooling. No problem with the system, just overcharged. A/C is a science, each system is different, and will run different pressures on low/high side. If converting from R-12 to 134A, leave bubbles in the sight glass on the receiver/dryer. Engine at 1100-1200, fan in high, all doors open on cab.
Edited by cottonhauler 6/24/2016 20:38
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