With that amount of charge and those pressures, you probably have a restriction at the expansion valve. Assuming you have the system on outside air and high speed blow. A restriction between the receiver/dryer and the compressor will cause low pressure, as all the refrigerant will be stored in the condenser and dryer, leaving the compressor nothing to pump. Most likely you will find the expansion valve screen restricted. Refrigeration 1 oh 1.
And while I'm on a roll, I would like to expand on what Doug said about "Freon". "Freon" was a DuPont trade mark and defines no chemical. Using Freon to define any refrigerant only shows lack of training and knowledge in the refrigeration world.
Richard