This should be a fairly straightforward job. I don't think you really need to be as strict as called out, but it would never hurt. I suggest that you remove (if not too difficult) the evaporator and condenser and drain the oil out of them. I also suggest replacing the hoses.
Some reasoning:
In an R-12 system, the oil circulates with the refrigerant thus lubricating the compressor and any other moving parts - like if it uses an expansion valve. In an R-134a system, the oil also needs to circulate. However, in the R-12 system, the oil used is a mineral oil, and in the R-134a system, either an ester oil or a PAG oil is used. This is because the mineral oil will not circulate in an R-134a system. So, they use a different oil that will circulate. Unfortunately, the oils used with R-134a have an affinity for water, and will absorb moisture from the air. The hoses used with the R-12 will allow R-134a refrigerant to permeate them. For this reason, barrier hoses are used with the R-134a.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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