I do not want to come on to strong here but you or your ..service man.. need to follow the common theme repeated here often; trouble shoot first then apply parts as needed. I am doing a lot of assuming here which can lead to trouble as well. This is because I do not know the exact configuration of the A/C system on that tractor. A sensor ..more like a pressure switch.. on the condenser monitors for high pressure. When a certain pressure is reached it opens the circuit to the compressor clutch. This helps avoid over pressure of the high side of the system as well as over load of the compressor and clutch. Being a tractor from the 70s it would have had an R12 system so I am guessing it has been converted to 134A. So even though 134A will work in the system, it is a fact that it raises the pressures in the system which adds additional strain to the clutch and compressor. If the ..sensor.. he took out of the condenser was for monitoring high pressure he needs to reconnect it. There is a possibility that switch needs to be replaced with one that has a higher pressure spec to avoid nuisance kick out of the compressor due to higher operating pressure of 134A. Also on a 134A converted system it is HIGHLY important to keep the condenser clean and the airflow across it at the optimum of its design. Doing that helps keep the high side pressures down. So there can be no hydraulic leaks up front on the coolers or steering lines collecting oily dust. Now Dave has a legitimate question about if the system is utilizing the ..Superheat switch.. that is a hole different ball game.
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Today's Featured Article - A Farmall Restoration Story - What's Been Done So Far - by Sean Brinston. This is a story of my first real tractor restoration. My name is Sean Brinston and I was 15 almost 16 at the time of this.My neighbour directly across the road who I had helped with hay all the time had this tractor sitiing at his house for what I thought was 6 years. Finally I got the money and courage to ask him. I phoned him and he said it was already sold, eight years ago!
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