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8. Remove the screw and nut securing the flapper valves and remove and
discard old flapper valves.
9. Install the new flapper: check that the screw head and not the washer is
on the smooth side of the pump, and check that the flappers are
completely flat and straight.
10. Align the diaphragm head correctly as noted in Step 2, and secure with
the four socket head screws.
11. Place the new PTFE gasket over the pump head so that the eight screws
holes are aligned.
12. Replace the top plate and secure with the eight screws and washers
being sure that the Teflon gasket stays in place.
13. Reconnect the plumbing to the instrument and plug in the pump
power cord.
Maintenance
Pump Rebuilding
42iQHL Instruction Manual
5-7
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