Maintaining 600E Pump Components 69
7. Reconnect the eluent lines, reposition the eluent reservoir, and prime the pump. (For
priming information, refer to the Waters 600E Multisolvent Delivery System User’s
Guide, Chapter 3, Preparing Your System for Operation.) Check for leaks. If there is
a leak, verify pump head and plunger installation.
4.2.6 Cleaning and Replacing Pump Check Valves
This section covers:
• Removing an inlet check valve
• Cleaning an inlet check valve
• Installing an inlet check valve
• Removing an outlet check valve
• Installing an outlet check valve
Note: For information about isolating check valve problems in the 600E pump, see
Section 5.4.1, Testing the Check Valves.
Whenever you suspect a check valve of contributing to faulty pump operation, loosen and
then retighten the check valve housings. This restores the original sealing loads. If there is
no improvement, remove and clean the check valve.
Removing the Inlet Check Valve
1. Flush the pump with methanol.
2. Remove the eluent lines from the reservoirs.
3. Turn the inlet manifold knob to the Draw position. Using the priming syringe, draw
all of the methanol from the eluent lines (see Figure 4-1).
4. Remove the reverse ferrule connector from the inlet check valve housing underneath
the pump head.
5. Remove the pump head as described in Section 4.2.3, Removing the Pump Head.
6. Using a 1/2-inch wrench, remove the inlet check valve assembly and disassemble by
tipping the housing upside down. See Figure 4-10 and Figure 4-11.
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