I have a 347002k cooltech 700 robin air machine that worked fine, but now i changed the filter and vacuum pump oil and now it will not fill source tank and wont recover, the clearing the filter screen also will not go off, it fills source tank like normal til it gets to about a pound and then slows almost to a halt, it acts like it is filling up with air and wont let freon in, becuase if i purge the air it will work for another pound, i take the line off at the liquid port and and hit fill source tank and it sprays a steady stream so i dont think its the compressor?

Measuring Tools & Sensors - Robinair - Cool Tech 34700Z Recovery, Recycling, Recharging