KNF N1200.12, Original Operating And Installation Instructions

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Servicing Diaphragm Pump N1200.12, N1400.1.2.12
32 Translation of Original operating and installation instruction, English, KNF 308930-308933 02/22
Union nut
Marking
Fig.12 Marking of the union nuts
2. Only for two-headed pumps:
Remove the pneumatic connection between the pump heads; to do
this, mark and loosen the union nuts (see Fig. 2) according to Fig. 12.
3. Mark the head plate (4), intermediate plate (24), intermediate ring (22)
and housing (21) with a continuous line made with a felt-tip pen. This
helps avoid incorrect assembly later.
4. Loosen the six hexagon socket head cap screws (1) as well as the two
screws (6); Remove the head plate (4) and the intermediate plate (24).
5. Remove O-rings (7) and (8).
6. For two-headed pumps:
Perform steps 3 to 5 for the second pump head.
Changing working diaphragm and safety diaphragm
1. Heat the retainer plate (12) 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 retainer plate:
Loosen the retainer plate (12) from the conrod plate (23) with the
wrench for retainer plate by turning counterclockwise and remove the
retainer plate.
3. Remove the working diaphragm (10).
4. Heat the hexagon socket head cap screws (16) with a hot-air blower
(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 Allen
screw or other heated pump parts.
à
Wear protective gloves.
à
Loosen Allen screw with Allen key.
à
Only place the Allen screw on a heat-resistant
surface.
5. Loosen the hexagon socket head cap screws (16); remove the conrod
plate (23).
Caution: Take care not to let the shim ring(s) fall into the pump
housing.
When removing the conrod plate, remove and set the shim ring(s)
aside for safe keeping.
When remounting, use the exact same number of shim ring(s).
6. Loosen the three hexagon socket head cap screws (9); remove the in-
termediate ring (22).