122 Troubleshooting
Leak from pump
head (continued)
Loose pump head Tighten the two pump head screw(s). Ensure both
screws are tightened equally to prevent seal wear. Do
not overtighten.
Loose compression
screw(s) on the
pump head
Tighten the loose compression screw(s) with a
5/16-inch open-end wrench.
Loose inlet or outlet
check valve
Tighten the loose check valve(s). Do not overtighten.
Verify fittings and ferrules for under/overtightening
and wear. Replace if necessary. Refer to Section 2.1,
Selecting and Installing Fittings.
Erratic flow
rate/pump
pulsations
Mobile phase
improperly
degassed or sparged
Degas or sparge the eluent(s) and reequilibrate the
system (see the Waters 600E Multisolvent Delivery
System User’s Guide, Chapter 3).
Limit the amount of helium sparging to avoid
depleting volatile mobile phase components.
Pump not primed Prime the pump (see the Waters 600E Multisolvent
Delivery System User’s Guide, Chapter 3).
Reservoir low or out
of eluent
Check eluent level in reservoirs. Refill as necessary,
and degas/helium-sparge.
Air bubble in pump
head
Prime pump to remove bubble (see the Waters 600E
Multisolvent Delivery System User’s Guide,
Chapter 3). Ensure there are no air bubbles in the
eluent inlet lines. Degas or helium-sparge eluents.
Table 6-1 600E System Troubleshooting (Continued)
Symptom Possible Cause Corrective Action
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