7 Maintenance
37 Pump Combinations Operation Manual, Version E
7.5.1 Cleaning the seals
To prolong the lifetime of the seals and in case of unwanted sample contamination (foaming or boiling
retardation) rinse the seals with water or ethanol. Dry the cleaned seals with a soft cloth.
7.5.2 Changing the seals
Visually examine the seals regularly, if seals become cracked and brittle replace them with new ones.
For this purpose, proceed as follows:
1
Remove the pump head cover. Loosen the pump
head screws and remove it. Inside the head, there
is a radial seal a. Remove it.
Fig. 7.1: Removing the radial seal
Attach the new seal to the piston at the pump
housing, and not, as you might expect, to the in-
side of the pump head, so that the new seal does
not become bent and/or damaged.
Attach the pump head with the flat side first
straight onto the piston, so that the seal is straight;
otherwise it may be damaged. Tighten the screws
uniformly. Place the pump head cover onto the
pump head with the arrow pointing up.
Fig. 7.2: Installing the radial seal
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