Waters 1500-Series, Operator'S Manual

Page: 130 / 188

5-22 Maintaining the HPLC Pump
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 it 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 adjustable wrench.
12. Reinstall the outlet tubing assembly.
Tip:
Use the 5/16-inch open-end wrench to tighten the compression
screw while holding the housing with the adjustable wrench.
13. Reinstall the inlet tubing assembly.
Tip:
Use the 5/16-inch open-end wrench to tighten the compression
screw while holding the housing with the adjustable wrench.
14. Prime the pump as described in Chapter 4 . Check for leaks.
Replacing the 1525µ restrictor tee check valves
To replace the restrictor tee check valves, follow the procedure on page 5-19 .
Replacing a draw-off valve
Replace a draw-off valve if you notice that the valve leaks even after you
tighten the knob.
Required materials
• Open-end wrench, 5/16-inch (startup kit)
• Allen wrench, 7/64-inch (startup kit)
• Adjustable wrench, 1/2-inch (startup kit)
Caution:
To avoid damaging the plunger, ensure that the pump
head is straight and the indicator rod is properly aligned with the
pump head.