Thermo Scientific Dionex ICS-2000, Operator'S Manual

Page: 130 / 390

ICS-2000 Ion Chromatography System
5-20
Doc. 031857-03 4/06
6. The piston does not come off as part of the pump head assembly because it is
captured by a magnetic retention system. After removing the pump head, hold
the shaft of the piston (near the base), tilt the piston slightly, and pull the
piston away from the pump.
Installing the New Piston Rinse Seal
1. Remove the guide from the spacer to expose the piston rinse seal and O-ring.
Remove the O-ring.
2. Remove the old piston rinse seal from the guide as follows:
a. Hold the guide with the flat side facing up.
b. To dislodge the piston rinse seal,
gently insert the shaft of the piston
through the small hole in the center
of the guide (see photo).
c. Pull the seal off the end of the
piston shaft and remove the piston
from the guide.
3. Hold the new piston rinse seal (P/N
048722) with the grooved side facing
up.
4. Using your fingertip, gently press the piston rinse seal into the guide until the
edge of the seal is below the surface of the guide.
5. Place the new O-ring (P/N 059283) into the groove in the guide.
6. Remove the O-ring from the groove in the flat side of the spacer and replace it
with the new O-ring (P/N 014895).
7. In one hand, hold the guide with the O-ring and piston rinse seal facing up
(this prevents the O-ring from falling out). In the other hand, hold the spacer
with the cavity facing down.
8. Gently press the guide into the cavity in the spacer until it is fully seated.
The piston rinse seal is made of soft plastic. Do not press on the seal
with anything hard or sharp, including your fingernail. If the seal is
nicked or gouged, it will not seal properly and may result in leaks.