KNF N838 E Series - Page 43

Diaphragm pump N838_E
Servicing
Translation of Original Operating and Installation Instruction, KNF 347394-347605
09/23
43
The diaphragm and valve plates/seals are to be replaced in
the following order:
Initial steps
1. Disconnect the pump from the power supply and ensure
that it is voltage-free.
Remove pump head
1. Mark the head plate (3), the intermediate plate (2) and the
housing (1) with a continuous felt-tip pen line (M). This
helps to avoid incorrect assembly later.
2. Loosen the four head plate screws (4) and remove the
head plate (3) from the pump housing together with the in-
termediate plate (2).
Changing the diaphragm
1. Turn the fan wheel to move the diaphragm (7) to the upper
reversal point.
2. Lift the diaphragm (7) on opposing side edges. Then
grasp the diaphragm (7) and remove it by turning it coun-
terclockwise.
3. Remove the shim ring(s) (8) from the stud bolt of the di-
aphragm (7) and keep them in a safe place.
4. Check all parts for contamination and clean them if neces-
sary.
5. Push the shim ring(s) (8) onto the stud bolt of the new di-
aphragm (7).
6. Move the connecting rod to the upper reversal point by
turning the fan wheel.
7. Screw the diaphragm (7) with shim ring(s) (8) clockwise
onto the connecting rod and hand-tighten.
Replacing the valve plates/seals
1. Separate the head plate (3) from the intermediate plate
(2).
2. Remove the valve plates/seals (6) from the intermediate
plate (2).
EN
-
US
EN