4-24 Maintaining and Troubleshooting the Waters 515 Pump
16. Prime the pump as described in “Priming the pump” on page 3-15.
Check for leaks.
Replacing the draw-off valve
Replace the draw-off valve if you notice that the valve leaks even after you
tighten its handle.
Required materials
• 5/16-inch open-end wrench (Startup Kit)
• Priming syringe (Startup Kit)
• 7/64-inch Allen wrench
• Phillips screwdriver
• Replacement draw-off valve
• Methanol
Removing the draw-off valve
To remove the draw-off valve:
1. Purge the pump with methanol as described in “Purging the system” on
page 3-17. If methanol is not miscible with your current eluent, use an
intermediate eluent.
2. Disconnect the eluent supply line from the inlet manifold on the pump.
3. Insert the priming syringe into the luer fitting at the center of the
draw-off valve handle, then turn the handle counterclockwise about
1/2-turn to open the valve.
4. Use the syringe to withdraw all the methanol.
5. Use the 5/16-inch open-end wrench to disconnect the three stainless
compression screws from the draw-off valve.
Caution: Before you continue with this procedure, lower the eluent
reservoir to eliminate gravity flow
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