You should drain compressor and use Ester oil. Mineral oil and R134A are not 100 percent compatable but will tolerate some left over in system. I always install new filter drier. Sometimes new expansion valve. If cruddy system I flush, if not I just blow it out. Best to use nitrogen to blow as air has moisture in it. Just don't blow through new drier of course. You have to vacuum system to get rid of moisture and air. On those factory 66 series, you need to spend a great deal of time on cleaning the externals of that dirt infested condensor and make sure both fans are working good. Evaporator under roof may be full of dirt also. Have to be sure the evaporator is sealing properly also so air does not just go around in stead of through it.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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