Servicing
Diaphragm pump N026 EX
34
Translation of Original Operation and Installation Instruction, english, KNF 059217 11/19
WARNING
Risk of explosion from formation of potentially ex-
plosive atmosphere
Leaky connections can result in dangerous explo-
sive atmospheres.
à
Make sure that diaphragm, valve plates/seals,
and O-ring are installed undamaged, cleanly
and correctly.
à
Check the pneumatic connections of the pump
for leaks.
à
Work with care during service work.
à
Replace defective parts immediately.
WARNING
Health hazard due to dangerous substances in the
pump
Depending on the medium being transferred,
caustic burns or poisoning is possible.
à
Wear protective equipment if necessary, e.g.,
protective gloves, goggles.
à
Clean the pump with suitable measures.
Work steps
The following item numbers refer to Fig. 6.
1. Only for two-headed pumps:
Open the pneumatic connection between the two heads; loosen one of
the union nuts to do this; take care not to kink the connecting hose.
2. Removing the housing cover (H):
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.
Loosen the fastening screws (G) of the housing cover (H) and remove the
housing cover.
3. On a pump head, mark housing (A), intermediate plate (X) and head
plate (W) with a continuous line made with a pencil. This helps avoid
incorrect assembly later.
4. Loosen the six hexagon socket head cap screws (Y) and remove the
head plate (W), valve plate (Z) and intermediate plate (X) from the
housing.
5. Only AT and ST versions:
Remove the O-ring (B) from the head plate (W).
6. Use a wrench for retainer plate to loosen the retainer plate (E) counter-
clockwise; remove the retainer plate and the diaphragm (F).
7. Check all parts for soiling and clean the parts necessary.
