7-8
5.2.3.1 Removing the Seals
1. Remove the pump head as described in Section 5.2.1. Use caution so
as not to damage the sapphire piston.
2. Insert the flanged end of the seal insertion/removal tool into the seal
cavity on the pump head. Tilt it slightly so that flange is under the seal
and pull out the seal.
CAUTION: Using any other “tool” will scratch the finish.
3. Repeat the procedure for the low-pressure seal in the flush housing.
4. Inspect, and if necessary, clean the pump head as described in Section
5.2.2.
5.2.3.2 Cleaning the Piston
1. Once the pump head and self-flush housing are removed, gently
remove the seal back-up plate by using either a toothpick or small
screwdriver in the slot on top of the pump housing.
2. Grasp the metal base of the piston assembly so that you avoid exerting
any side load on the sapphire rod, and remove the piston from the slot
in the carrier by sliding it up.
3. 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 piston
frequently to assure 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.
4. Grasp the metal base of the piston assembly, and insert it into the slot
in the piston carrier until it bottoms in the slot.
5.2.3.3 Replacing the Seals
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.
Summary of Contents for BINARY SOLVENT DELIVERY MODULE
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