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Maintenance
3. Wear part replacement
For a long period of operation wear parts need to be
replaced periodically.
CAUTION
● Turn off power before service
Risk of electrical shock. Be sure to turn off power to
stop the pump and related devices before service is
performed.
● Do not touch the pump or pipe with bare hands
Risk of burning. The surface temperature of the
pump or pipe gets high in or right after operation.
●
Wear protective clothing
Always wear protective clothing such as an eye pro-
tection, chemical resistant gloves, a mask and a face
shield during disassembly, assembly or maintenance
work.
See page 7 "
8. Part names & Structure"
as necessary.
■ Diaphragm replacement
<APN-085>
1. Unscrew all the pump head
fixing screws and take out
the pump head, valve and
valve seat.
2. Catch the diaphragm nut
with a special spanner and
turn the diaphragm anti-
clockwise so as to detach it
from the con rod (Fig.1).
3. Mount a new diaphragm into
the rod and fasten as far as
it will rotate with the span-
ner.
4. Push down the diaphragm
until it bottoms out and then
mount and secure the valve
seat, valve and pump head
onto the bracket with the
screws by 1.39N•m.
Screw
Diaphragm
Pump
head
Valve
Mating
points
Valve seat
Bracket
Diaphragm
Special
spanner
Bracket
Con rod
Fig.1
