Crystal T-1-CPF Hydraulic Comparator - Manual (Page 12)

Operation and Maintenance  10
Type T Pump Operation Manual
3 Pull the pump handle to the top of its stroke.
4 Open the vent valve.
5 Pull out the valve rod selector to select low pressure/high volume.
Open the vent valve… then select low pressure/high volume.
6 Pump ten full strokes.
7 Close the vent valve
8 Continue pumping to verify the low pressure/high volume setting operates properly and that the pump holds pressure.
9 Open the vent valve.
10 Pump ten more strokes.
11 Remove the high pressure/low volume check valve plug.