4-22 Maintaining and Troubleshooting the Waters 515 Pump
5. Use the syringe to withdraw all the methanol.
6. Use the 5/16-inch wrench to disconnect the tubing from the inlet and
outlet check valves of the pump head. If you notice that a check valve
turns while you are disconnecting the tubing, use the 1/2-inch wrench to
hold the check valve in place.
Disconnecting the outlet tubing
7. Remove the pump head as described in “Replacing the plunger seals” on
page 4-9.
8. Use the 1/2-inch open-end wrench to loosen the outlet check valve a
half-turn. Do not remove the valve.
9. Hold the pump head upside-down in one hand with the outlet check
valve housing facing the floor, then remove the housing (see the figure
“Removing the outlet check valve” on page 4-23).
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