Oritron Dionex Ion Chromatography System ICS-2100 - Manual (Page 135)

5 • Service
Doc. 065291-01 3/09
123
Removing the Piston Seal from the Head
1. Fill the head cavity with deionized water by injecting the liquid through either
the piston opening or the inlet check valve.
2. Reinsert the piston approximately 3 mm (0.125) inch into the seal.
3. If this is the primary pump head, install a 10-32 fitting plug (P/N 042772) on
the outlet check valve. Tighten the plug.
4. If this is the secondary pump head, install a 10-32 fitting plug (P/N 042772)
in both the inlet and outlet ports. Tighten the plugs.
5. Push the piston into the head. (This should hydraulically unseat the seal from
the head.) Remove the piston and pull off the seal.
NOTE If the piston seal is not removed, make sure the 10-32
fitting plug(s) are tight and add more water. Make sure
the head contains no air bubbles, and then repeat
Step 2
and Step 5 .
6. Remove the 10-32 fitting plug(s).
Installing the New Piston Seal
1. Open the priming valve knob (primary pump head) or waste valve knob
(secondary pump head) by turning the knob one-quarter to one-half turn
counterclockwise.
2. Push the piston through the spacer and then through the new seal. Insert the
piston and seal into the pump head until the seal makes contact with the
bottom of the counterbore.
NOTE If necessary, lubricate the seal with a small amount of
isopropyl alcohol to facilitate insertion.
3. To seat the seal, push down on the spacer until it is flush with the head. A
clicking sound indicates that the seal is correctly seated.
4. Close the priming valve knob or waste valve knob.