7 Maintenance
192 July 29, 2013, 715003794 Rev. B
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.
If the separations module’s solvent lines are empty, dry prime the solvent
management system before you wet prime it or start delivering solvents (see
“Prime the solvent management system” on page 107).
Clean and replace the plunger
Tip: For information about isolating problems in the solvent management
system, see Chapter 8.
Required materials
• Pumice, fine
• Cotton swab
• Water, HPLC-grade
To clean the plunger:
1. Remove the head, seal-wash assembly, and plunger (see “Remove the
head, seal-wash assembly, and plunger” on page 185.
2. Inspect the plunger for damage, excessive wear, or mobile-phase residue
without separating it from the pump head and seal-wash assembly (see
the figure “Plunger, seal-wash, and head:” on page 193).
Tip: If the plunger seal has mobile-phase residue, perform these tasks:
• Separate the plunger from the head and seal-wash housing
assembly.
• Clean the plunger with a fine pumice to remove any coating.
• Rinse the plunger thoroughly with water to remove all traces of
abrasive, then wipe clean.
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