GE AKTA avant Operating Instructions Manual page 157

Step
8
9
10
ÄKTA avant Operating Instructions 29101556 AB
7.2 Replace pump piston seal, O-rings, and rinse membrane of Pump P9 or Pump P9H
Action
Carefully pull off the pump membrane housing together with the piston and
return spring.
Inspect the piston and return spring for signs of damage. If damaged, discard
the piston and return spring and use a new piston and return spring when
assembling the pump head.
Clean the pump head and pump membrane housing in an ultrasonic bath.
If there are particles on any surfaces, the check valves should be removed
and cleaned separately, see
page 173.
Section 7.5 Clean pump head check valves, on
7 Maintenance
157