ActionStep
Unscrew one of the two screws securing the pump membrane housing using a star
screwdriver, T20. Unscrew the second screw, and at the same time push firmly on the
front of the pump membrane housing to compensate for the pressure of the piston return
spring.
7
Carefully pull off the pump membrane housing together with the piston and return spring.8
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.
9
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 Section 7.6.8 Clean the pump head check valves, on page 296.
10
ÄKTA pure User Manual 29119969 AB 339
7 Maintenance
7.8 Replacement procedures
7.8.10 Replace pump piston seals of Pump P9 or P9H
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