ICS-1000 Ion Chromatography System Operator's Manual

5•ServiceReinstalling the Head and PistonDionex recommends reinstalling the head and piston as a single assembly, so thatthe piston centers itself onto the magnetic follower.1. Hold the assembled spacer and guide with the drain tubes aligned verticallyand press the spacer into the head until it is flush with the indented surface ofthe head.2. Insert the piston so that 1/4 inch of the shaft is exposed. This ensures that themagnet in the follower picks up the piston. (The follower is the cylinder thatholds the piston in place as it moves in and out of the pump head assembly.)3. Reinstall the head and piston assembly; use a wrench to tighten the nutsevenly (12 in-lb torque).Completing the Procedure1. Reconnect all liquid lines to the pump head.2. Turn on the main power switch.3. Open the eluent valve.4. Prime the pump (see Section B.12).5.7 Replacing a Pump PistonContinued leaking of the piston seal after installation of a new seal (assumingthe pump head is tight) indicates a dirty, scratched, or broken piston.Follow the instructions in Section 5.6 to install a new piston (P/N 052840) andpiston seal (P/N 055870).Doc. 031879-01 3/03 5-17