Waters 600e - Page 146

Troubleshooting the 600E System 121
Pump not deliv-
ering eluent
(continued)
Damaged plunger
seal
Check for eluent leaking from behind the pump head.
This is an indicator of a damaged plunger seal.
Check if both pump heads maintain pressure as
outlined in the following section. If not, replace the
plunger seal (see Section 4.2.4, Replacing the
Plunger Seal).
Pump head
cavitating
Verify if the problem is due to:
• Eluent reservoirs positioned below the pump -
Raise eluent reservoirs higher than the pump
heads.
• Loose, bent, or blocked pump inlet tubing -
Check tubing. Tighten, straighten, or replace
tubing.
• Improperly degassed eluent - Degas or helium
sparge eluents to prevent cavitation.
• Dirty eluent reservoir inlet filter - Remove and
clean with methanol. Clean eluent inlet filter frit
by attaching to priming syringe and drawing
methanol through in both directions.
• Volatile eluents in pump head - Prime pump
(see Waters 600E Multisolvent Delivery System
User’s Guide, Chapter 3).
• Tubing ID too small for eluent inlet - Use
correct tubing.
Inlet manifold valve
open or leaking
Turn the valve to the Run position. If eluent still
leaks, replace the manifold.
Failure of gradient
proportioning valve
Contact Waters Technical Service.
Leak from pump
head
Worn pump plunger
seals
Replace defective plunger seals (see Section 4.2.4,
Replacing the Plunger Seal).
Worn plunger Repair or replace plunger (see Section 4.2.5,
Cleaning and Replacing the Pump Plunger).
Table 6-1 600E System Troubleshooting (Continued)
Symptom Possible Cause Corrective Action