MTS Model 286-31 Transient Permeability Pore Pressure Intensifier - Manual (Page 19)

Purging and Filling the Fluid Lines
286.31 Transient Permeability Pore Pressure Intensifier Operation 19
4. Fill the Fluid Reservoir.
If your 286.31 is connected to a distilled water supply —
Turn the Reservoir Fill/Drain valve to the Open position.
When the Fluid Reservoir is about 3/4 full, turn the Reservoir Fill/
Drain valve to the Close position.
If your 286.31 is not connected to a distilled water supply —
Remove the filler plug at the top of the 286.31’s cabinet.
Open the console’s rear door. Unscrew one of the hex–head plugs in the
Reservoir. (This allows air to vent more easily out of the Reservoir.)
Use a funnel to fill the Fluid Reservoir about 3/4 full.
Seal the filler cap and hex–head plug with Teflon thread sealing tape
and reinstall them.