Waters 1500-Series, Operator'S Manual

Page: 140 / 188

6-6 Troubleshooting
Leak from pump
head
Worn pump plunger
seals
Replace defective plunger seals
(see page 5-6 ).
Worn plunger Replace the plunger (see
page 5-6 ).
Loose pump head Tighten the two pump head
screws. Ensure that both
screws are tightened equally,
otherwise seal wear may
result. Do not overtighten.
Loose inlet or outlet
check valve
Tighten the loose check
valve(s). Do not overtighten.
Inspect 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 the
leak continues, replace the
valve (see page 5-22 ).
Erratic flow
rate/pump
pulsations
Pump not primed Prime the pump. If you are
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.
Reservoir low or out of
eluent
Refill reservoir (filter and
degas eluent).
Air bubble in pump
head
Prime pump to remove bubble.
Ensure there are no air
bubbles in the inlet lines.
Degas eluents.
Determining pump malfunctions (Continued)
Symptom Possible cause Corrective action