best way to charge is by weight, buy electronic scale, buy mainfold gage setup, buy freon in 30# jug, hang gages somewheres for evacuating and charging. Leave them there don't move till completely done. After evacuating and it holds, hook up freon jug to gage manifold(yellow), open jug valve crack line to jug at manifold to let residual air out. Now, theres a zero scale button on scale set it to"0". slowly open low(blue) pressure manifold vale connected to A/C low pressure port. then take you hands off of manifold setup, let freon go in till it won't anymore. Now start tractor turn on A/c and turn it to High/ and fan to high. Watch scale till it shows measured amout you want in A/c. turn off low pressure valve(blue) on Manifold gage FIRST, then turn off freon jug, and unhook it from manifold gage(yellow} put line off jug back on gage open port. Your system should be cooling well. If not, then theres a restriction somewhers in system. if it on high side after compressor but before before orfice tube/exspansion valve and the high pressure cut out switch for compressor isn't working you will hammer the compressor(extremely high pressure). if restrictions past orfice tube/exspansion valve, it will just remain as a gas., won't have compressor suction(low suction) of gas to change back to a liquid.
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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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