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Problem
Seal life unusually
short
Frequent check
valve failure
Failure to prime
No power to
instrument
3
If a slight amount of additional tightening does not stop the leak, replace the fitting. Over-tightening the
fitting can damage the seat, strip the threads, or worse, cause the nut to shear off. Never exceed 15 in-lbs
of torque.
4
It is not always obvious by visual inspection if a piston is worn or scratched. Use a magnifying glass to
look for a glazed appearance, or axial grooves and scratches. The piston is worn if any of these
conditions are visible.
5
If the seal is badly worn, then the pump head will be contaminated with seal wear material. Remove the
check valves from the pump head and sonicate the head in a light soap (e.g., Liquinox®) solution for 30
minutes. Rinse thoroughly, then sonicate for 10 minutes in deionized water. Wet seal and pump head with
IPA prior to reassembly. The inlet check valve should be flushed with 50 mL of HPLC grade IPA or water,
and inspected.
Cause
Worn or scratched piston
Build-up of salts on piston
Mobile phase incompatible
with seal material
Contaminated solvent
No solvent filter
Worn pump seal or Piston
Service life of check valves
has been exceeded
Excess back pressure in the
pump head
Check Valve installed
upside down
Clogged solvent inlet filter
Loss of power
Power cord disconnected or
loss of power at source
Fuse blown
Remedy
4
Replace with new piston.
Always run DI water through the pump before
shutting down for the day when running
buffers.
Use a Teflon® seal.
Use clean HPLC grade solvent.
Always use 10 micron or finer solvent filter.
5
Replace seal. Inspect piston and replace if
worn.
Install new check valves.
Open purge valve, or open pump head fittings
at outlet check valve.
Verify that arrow on check valve body is
aligned with the flow for both inlet and outlet
check valves.
Clean or replace with new filter
Check power
Reconnect power cord and confirm power
supply at the source.
Replace only with same type and rating of
fuse.
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