KNF N1200.12, Original Operating And Installation Instructions, Page: 33 / 60

Diaphragm Pump N1200.12, N1400.1.2.12 Servicing
Translation of Original operating and installation instruction, English, KNF 308930-308933 02/22 33
7. Remove the O-ring (20) from the housing (21).
8. Remove the O-ring (11) together with conrod plates (23) and (15).
9. Remove the safety diaphragm (13).
10. Remove the shim ring(s) (19) from the shaft of the conrod plate (23)
and store the shim ring(s) in a safe location.
11. Remove the conrod plate (23) from the conrod plate (15); remove the
O-ring (14) from the conrod plate (15).
12. Check all parts for contamination and clean the parts if necessary.
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.
13. Insert the new O-ring (14) in the conrod plate (15).
14. Place the safety diaphragm (13) on the conrod plate (15) together with
the conrod plate (23); make certain that the bulge on the inner diame-
ter of the safety diaphragm lies in the groove of the conrod plate (15).
15. Mount the exact number of shim ring(s) (19) on the shaft of the conrod
plate (23); mount the conrod plate (23).
16. Insert the new O-ring (20) in the housing (21).
17. Place the intermediate ring (22) on the housing (21) according to the
felt-tip pen marking and hand tighten the screws (9) crosswise; make
certain that the bulge on the inner diameter of the safety diaphragm
(13) lies in the groove of the housing.
18. Mount the hexagon socket head cap screw (16) (tightening torque: 45
Nm).
19. Insert the new O-ring (11) in the conrod plate (23).
20. Insert the new O-ring (8) in the intermediate ring (22).
21. Turn the fan blade to move the conrod plate (23) to the middle position.
22. Place the new working diaphragm (10) on the conrod plate (23) and
the intermediate ring (22); make certain that the bulge around the inner
circumference of the working diaphragm lies in the groove of the con-
rod plate.
23. Apply the adhesive around the thread of the retainer plate (12) and in
the threaded hole of the conrod plate (23) and screw the retainer plate
into the conrod plate.
While screwing in, turn the retainer plate back one turn to allow the
adhesive to spread onto both thread flanks (retainer plate and con-
rod plate).
Attention: Note the use-by-date for the adhesive.
The adhesive may lose its effectiveness after the use-by-date has
passed.
24. Then securely tighten the retainer plate (12) with the wrench for re-
tainer plate (tightening torque: 20 Nm).
Attention: Observe the harding time for the adhesive when recom-
missioning the pump.
The hardening time of the adhesive is approx. 24 hours.
25. For two-headed pumps:
Perform steps 1 to 21 for the second pump head.
Changing reed valves
1. Loosen the two screws (2) and remove the valve limiters (3) and reed
valves (5) from the intermediate plate (24).