ICS-900 Operator’s Manual
80 Doc. 065215-02 9/09
5.7 Replacing a Pump Piston Seal and Backup Seal
A damaged seal allows leakage past the piston, as well as leakage from the piston
seal wash housing. The pump may be difficult to prime, flow rates may be
unstable, and there may be baseline noise.
Preparation:
1. Rinse the pump flow path with deionized water. Direct the flow to waste by
opening the waste valve on the secondary pump head (see Figure 5-7
). To
open the valve, turn the knob one-half turn counterclockwise.
2. After rinsing, close the waste valve.
3. To prevent contamination of pump parts, put on a pair of rubber gloves before
disassembling the pump head.
To remove the head and piston:
1. Turn off the power switch and disconnect the power cord.
2. Disconnect all tubing connections to the pump head.
3. Using a 7/64-in hex key (P/N 068227), loosen the two screws on the pump
head with the defective seal. Remove the screws, and then carefully remove
the head and place it on a clean surface.
4. Slowly pull the head and allow it to separate from the housing. Carefully
disengage the head from the piston by pulling the head straight off and away
from its mounting studs.
5. Place the head (front end down) on a clean work surface
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
Lateral motion while disengaging the pump head from the piston may
break the piston.
Un mouvement latéral pendant la séparation de la tête et du piston
peut casser le piston.
Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Pumpenkopg
vom Kolben lösen. Andernfalls kann der Kolben brechen.
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