Dionex AXP/AXP-MS Manual
5.2.3.2 Cleaning the Piston
It is not necessary to remove the piston from the housing to clean the
piston. Use the scouring pad included in the seal replacement kit to
clean the piston. Gently squeeze the piston within a folded section of
the pad and rub the pad along the length of the piston. Rotate the pad
frequently to ensure that the entire surface is scrubbed. Do not exert
pressure perpendicular to the length of the piston, as this may cause
the piston to break. After scouring, use a lint-free cloth, dampened
with alcohol, to wipe the piston clean.
5.2.3.3 Replacing the Seal
1. Place a high pressure replacement seal on the rod-shaped end of
the seal insertion/removal tool so that the spring is visible when
the seal is fully seated on the tool. Insert the tool into the pump
head so that the open side of the seal enters first, facing the high
pressure cavity of the pump head. Be careful to line up the seal
with the cavity while inserting. Then withdraw the tool, leaving the
seal in the pump head. When you look into the pump head cavity,
only the polymer portion of the seal should be visible.
2. Attach the pump head as described in Section 5.2.5.
3. Condition the new seal as described in Section 5.3.
5.2.4 Changing the Piston
1. Remove
the pump head as described in Section 5.2.1.
2. With your thumb pressing the piston retainer against the pump
housing, remove the two Phillips head screws from the retainer.
Do not allow the spring pressure to force the retainer away from
the housing as the screws are loosened.
3. After both screws have been removed, slowly allow the spring
pressure to push the retainer out of the housing. Gently pull the
retainer straight out and carefully remove it from the piston and
threaded rods. Also, gently pull the spring straight out of the
housing and remove.
4. Grasp the metal base of the piston assembly so that you avoid
exerting any pressure perpendicular to the length of the piston, and
gently pull it from the pump housing.
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