YL9110 Quaternary Pump
5-10. Troubleshooting
In case general problem occurs as the following table, confirm the possible causes regarding this first,
and then take proper countermeasures. The following table is countermeasure in case general problems
occur.
Problem Cause How to fix
Pressure upper
limit is loaded.
-Tubing inside is blocked.
-Check valve is blocked.
-Solvent is chan
ed.
-Replace blocked tubing by
loosening to be from tail side in turn.
-Replace outlet check valve.
-Wait until solvent is completely
chan
ed.
Pressure
increases or
decreases.
-Change of solvent is incomplete.
-Column is unstable.
-Wait until change is completely
performed.
-Wait until pressure is stable.
Solvent is not
flowed out
-Air bubble is in pump head.
-Air separation status of
solvent is bad.
-Check valve is not good.
-Liquid containing oil flows
into head part.
-High pressure seal was worn.
-Perform prime/purge again.
-Take measures so that air
separation condition of solvent may
be good, and perform prime/purge
again.
-Wash or replace check valve.
-Remove oil in head sufficiently
with strong organic solvent
using prime/purge port.
-Replace the high pressure seal.
Pressure is
unstable.
-Check valve is bad or defected.
-Air separation or mixing
conditions of solvent is bad.
-Compression compensating
reference value of configuration
mode is wrong.
-Cam shaft is loosened.
-High pressure seal was worn.
-Pump head was loosened.
-Wash or replace check valve.
-Use mobile phase with well mixed
solvent, and improve air separation
condition.
-Initialize compensation value or
re-input proper value.
-Tighten wrench bolt of cam shaft
-Replace high pressure seal.
-Tighten nut of pump head.
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