ProMinent CONCEPTplus CNPa Mode D'emploi page 46

Repairs
8. Loosen the diaphragm (3) from the drive
axle with a gentle backwards turn of the
dosing head (2), diaphragm (3) and
backplate (4) in an anticlockwise direc‐
tion.
9. Unscrew the diaphragm (3) completely
from the drive axle.
10. Remove the backplate (4) from the
pump housing (6).
11. Check the condition of the safety dia‐
phragm (5) and replace if necessary.
12. Push the safety diaphragm (5) onto the
drive axle only until it lies flush with the
pump housing (6) and no further!
13. Tentatively screw the new diaphragm
(3) onto the drive axle until it can go no
further.
The diaphragm (3) is now sitting at
ð
the stop of the thread.
14. Should this not work, remove dirt or
swarf from the threads and screw the
diaphragm (3) onto the drive axle cor‐
rectly this time.
Ensure that the diaphragm is
screwed exactly onto the drive axle
otherwise the pump will subse‐
quently not meter accurately!
15. Unscrew the diaphragm (3) again.
16. Place the backplate (4) onto the pump
housing (6).
46
CAUTION!
Leakage may become apparent at
a later stage.
– Make sure that the leakage
hole points downwards when
the pump is installed later -
please refer to !
– Place the backplate (4) imme‐
diately in the correct position
on the pump housing (6)! Do
not twist the backplate on the
pump housing to prevent the
safety diaphragm (5)
becoming warped!
17. Place the diaphragm (3) into the back‐
plate (4).
CAUTION!
Leakage may become apparent at
a later stage.
– Do not over-tighten the dia‐
phragm (3) in the following
step!
– Ensure that the backplate (4)
remains in its position so that
the safety diaphragm does not
become warped!
18. Hold the backplate (4) firmly and screw
the diaphragm (3) in a clockwise direc‐
tion until it is sitting tightly (the twisting
resistance of the return spring can be
felt).
19. Set the stroke length to 100 %.
20. Place the dosing head (2) with the
screws (1) onto the diaphragm (3) and
the backplate (4) - ensure that the suc‐
tion connector points downwards when
the pump is subsequently fitted.