Troubleshooting Pump Problems 82
5
Leak from pump head Worn pump plunger seals Replace defective plunger
seals (see Section 4.3.3
and
Section 4.5.3
).
Worn plunger Replace plunger see
Section 4.3.3
and
Section 4.5.3
).
Loose pump head Tighten pump head screws.
Ensure that both screws are
tightened equally, otherwise
uneven seal wear may result.
Do not overtighten.
Loose inlet or outlet check
valve
Tighten loose check valve(s).
Do not overtighten.
Check fittings and ferrules for
wear. Replace if necessary.
Leak from draw-off
valve
Draw-off valve open or broken Close the draw-off valve. If
leaking continues, replace the
valve (see Section 4.7,
Replacing a Draw-Off Valve).
Erratic flow rate/pump
pulsations
Pump not primed Prime the pump. If using a
volatile eluent (such as
hexane), prime the pump with
a miscible, less volatile eluent
such as THF or methanol.
Ensure that the column is
disconnected to avoid
disrupting equilibrium.
Table 5-1 Correcting Pump Problems (Continued)
Symptom Possible Cause Corrective Action
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