Given the symptoms as I understand them, it's not cooling but it's charged correctly, the low side is probably lower than it should be, and the high side is otherwise reading within an acceptable range, it sounds to me like the expansion valve isn't working properly. Basically, if it doesn't open far enough it will cause the low side to be lower than normal because the compressor is trying to suck the refrigerant through it, but can't. On the high side there is no where for the gas that is being pumped to go, so oftentimes the high side pressure can be higher than normal, but still show within an acceptable range given the allowable variations due to outside temp, humidity, etc.
That said, I've been working on equipment A/C systems for about 15 years now, both the OEM and aftermarket ones. Unless they have come out with something new every one of them I have seen runs an expansion valve instead of an orifice tube. So, if I saw what you are describing on a customers machine the first thing I would do is replace the expansion valve, and more than likely go ahead and replace the receiver/dryer also for added insurance.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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