Diaphragm pump N680 EX
Servicing
Translation of Original Operation and Installation Instruction, english, KNF 325438 02/22
33
WARNING
Risk of explosion from damage
If the housing cover is bent or if the paint is dam-
aged, there is no risk of explosion.
à
Perform the work steps carefully and without
the use of force.
5. For two-headed pumps:
Carry out step 3 for the second pump head.
Replacing the diaphragm
1. Heat the retainer plate (
15
) with a hot air gun (T=approx. 400 °C) for
approx. 5 minutes to approx. 100 °C.
WARNING
Risk of burns from hot parts
Burns may occur on skin contact with the hot re-
tainer plate and countersunk screw or other
heated pump parts.
à
Wear protective gloves.
à
Only loosen the retainer plate with face span-
ner wrench.
à
Only place the retainer plate and countersunk
screw on a heat-resistant surface.
2. Removing the retainer plate (
15
):
Loosen the retainer plate from the conrod plate (
14
) with the wrench
for retainer plate by turning counterclockwise and remove it.
3. For SP head only:
Remove the diaphragm (
17
).
4. For ST head only:
Remove the diaphragm (
17
) together with the PTFE washer (
16
).
5. Only .13:
Remove the O-ring (
11
) from the housing.
6. Only .13:
Remove the O-ring (
10
) from the conrod plate (
14
).
7. Check all parts for contamination and clean them if necessary (see
).
There may be glue residue on the external thread of the retainer
plate as well as on the internal thread of the conrod plate. Remove
this.
8. Turn the fan blade to move the connection rod with conrod plate (
14
) to
the middle position.
9. For SP head only:
Fit the new diaphragm (
17
) on the conrod plate (
14
); make certain that
the inner beads on the outer and inner circumference of the diaphragm
are seated in the grooves of the housing and conrod plate.
