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The pumping down (start up) process is, for the most part, automated, and controlled by the data system:

“Once you close the vent valve and turn on the main power switch (while pressing on the sideplate), the MSD pumps down by itself. The data system software monitors and displays system status during pumpdown. When the pressure is low enough, the program turns on the ion source and mass filter heaters and prompts you to turn on the GC/MSD interface heater. The MSD will shut down if it cannot pump down correctly.”

Source: Agilent 5975 Series MSD Operation Manual, p. 61.

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