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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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