Turn compressor shaft 8-10 full revolutions to insure front seal and other internal parts are lubricated. You are purchasing a Reman compressor with clutch. THE SYSTEM (COMPRESSOR INSTALLATION). Remove compressor, receiver drier or accumulator, orifice tube or expansion valve.
Very thing was very good about this AC compressor except that it did not come with the o rings? My mechanic had to use some he had, why something as inexpensive but very important was not shipped with the compressor is something I don’t understand