Maintain the solvent management system
July 29, 2013, 715003794 Rev. B 189
Face seal replacement
To replace the face seals:
1. Remove the head (see “Remove the head, seal-wash assembly, and
plunger” on page 185).
2. Direct compressed air into the center of the face seal, or use plastic
tweezers to remove the inlet and outlet face seals from the seal openings
in the head (see the figure “Plunger and face seal orientation:” on
page 188).
3. Wet the new seals and seal openings with 100% alcohol.
4. Place the new face seals in the face seal openings of the head.
5. Use an alcohol-cleaned, flat object, such as a detector window, to firmly
press the face seals into the openings on the pump head.
6. After you replace the seals, observe the Head Removal and Replacement
screen.
7. Follow the on-screen instructions to reinsert the head, seal-wash
housing, washer, and plunger assemblies.
Requirement: To avoid damaging the tube seals and to properly align
the seal-wash tubes with the seal-wash housing, refer to step a through
step d, below. Also, make sure that the head alignment pin is properly
oriented and that the “J” tube faces downward (see the figure “Plunger,
seal-wash, and head:” on page 193).
a. After finger tightening the head nut onto the head, loosen (turn
counterclockwise) the nut approximately 1/2 turn.
b. Inspect the ends of the seal wash tubes for damage.
Tip: If necessary, trim the ends with a razor blade.
c. Reinsert the seal-wash tubes into the manifold, and then fully
tighten the head nut.
d. Return the release ring to the run position.
Caution: To avoid damaging the sealing surfaces, use the seal removal
tool. Do not use a sharp tool to remove or install seals. Replace face seals
after every two or three plunger seal replacements.
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