
System and Sample Pumps
Instrument Guide | 161
5. Locate the wash housing O-ring and the pump head small washer. If you do not
see them on the separated pump head:
The O-ring might be attached to the wash housing.
The small washer might have remained on the pump piston.
6. Remove and store the O-ring and small washer in a safe place such as a petri
dish or other small container.
Tip: You can remove the O-ring from its groove with a pair of tweezers if
necessary.
Note: Do not lose or damage the O-ring or small washer. The pump will
not operate without them.
7. (Optional) Remove the inlet and outlet check valves on the pump head.
Tip: It is not necessary to remove the inlet and outlet check valves unless
you plan to clean or replace them. See To remove the pump head check
valves on page 162.
8. (Optional) Replace the pump head seal. For more information, see To replace
the pump head seal on page 167.
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