GE AKTA avant User Manual page 351

Step
7
8
9
10
11
ÄKTA avant User Manual 29035184 AE
Action
Unscrew the two white plastic screws located below each pump head. Pull
the plastic connectors to the sides to release the inlet manifold.
Unscrew the lower check valve using an adjustable wrench.
Replace the lower check valve with a new one.
Tighten the nut until fully finger-tight and then use the adjustable wrench
to tighten a further 180 degrees.
Refit the inlet manifold and reconnect the tubing to the pump head.
7 Maintenance
7.8 Replacement procedures
7.8.8 Replace pump head check valves
351