Replacing 1525EF Plunger Seals and Plungers
64
4
8.
With the outlet check valve housing held upright to prevent the cartridge from falling
out, finger-tighten the housing into the pump head.
9.
Turn the pump head over and carefully slide the pump head over the plunger and
onto the pump.
10. Holding the pump head securely against the pump, reinstall the two mounting
screws. Alternately tighten the screws to secure the pump head to the pump. Do not
overtighten.
11. Tighten the check valve housing 1/4-turn with the 1/2-inch adjustable wrench.
12. Reinstall the outlet tubing assembly. Use the 5/16-inch open-end wrench to tighten
the compression screw while holding the housing with the 1/2-inch adjustable
wrench.
13. Reinstall the inlet tubing assembly. Use the 5/16-inch open-end wrench to tighten
the compression screw while holding the housing with the 1/2-inch adjustable
wrench.
14. Prime the pump as described in
. Check for leaks.
Replacing the Restrictor Tee Check Valves
To replace the restrictor tee check valves, follow the procedure in
4.5 Replacing 1525EF Plunger Seals and Plungers
This section describes how to:
•
Remove and replace plunger seals
•
Remove and replace plungers
The plungers in a Waters 1525 Pump are ultrasmooth, chemically inert sapphire rods. Salt
crystals that precipitate out from the eluent can form on the plunger and cause wear on
the plunger seals and on the plunger itself. The result is a slow leak and a very slight cyclic
pressure fluctuation, with a possible increase in retention time.
For continued high performance of the pumps:
•
Replace the plunger seals twice yearly, or as needed.
•
Replace the plunger once each year, or as needed.
•
Clean and inspect the plunger twice yearly (or sooner if using abrasive eluents).
STOP
Attention:
Ensure that the pump head is straight and the indicator rod is
properly aligned with the pump head to avoid damaging the plunger.
