4. Maintenance
4.1
Cleaning the Piston
Often, the pump seal is damaged by crystals left on the piston by dried solutions. To
prevent crystallization, connect tubes to the cleaning ports as shown on the picture below
and flush out the deposited crystal from the pump head with distilled water.
4.2
Replacing the Piston Seal
The piston seal needs to be replaced periodically to prevent solvent leakage. To replace
the piston seal, remove tubing from both inlet and outlet check valves. Use a hex wrench
to unscrew and pull out the pump head. Plug the inlet check valve with a STOP FITT and
connect the syringe connector to the outlet check valve. By using a syringe, fill the pump
head with distilled water. Insert the Seal Insertion Tool
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as shown below, and pull the
piston seal and O-ring gently out of the pump head. Insert a new piston seal and the O-ring
to the short end of the seal insertion tool. Make sure to have the O-ring facing outward.
Then insert the seal and O-ring into the pump head slowly. Re-attach the pump head to the
front panel and use a hex wrench to tighten the screws.
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Seal Insertion Tool is sold separately and not included in the original package.
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