Servicing
Diaphragm Pumps N 143/186.12
24
Translation of original Operating and Installation Instructions, english, KNF 121610-121613 07/16
7. Fit the new O-Ring (R) in the diaphragm support (N).
8. Turn the fan until the connecting rod is in mid-stroke; place the
new working diaphragm (L) on the intermediate ring (B) and
diaphragm support (N).
9. Place the retainer plate (J) on working diaphragm; to tighten
the retainer plate, use the wrench for retainer plate.
10. Fit the new O-ring (H) in the intermediate plate (C); secure the
O-ring with retaining clips, so that it cannot fall out during as-
sembly.
11. Place intermediate plate (C) on intermediate ring (B) according
to the mark made previously (at the same time, keep the dia-
phragm in its midposition by holding the motor fan).
12. Fit a new valve plate (G) in the recess in the intermediate plate
(C). A dowel pin/roll pin (Z) determines the correct orientation
of the intermediate plate.
13. Fit a new O-ring (F) in the diaphragm head (D); secure the O-
ring with retaining clips, so that it cannot fall out during assem-
bly.
14. Place head plate (D) on intermediate plate (C) in the position
given by the dowel pin/roll pin and the mark made previously.
15. Tighten the hexagon socket head cap screws (E) lightly.
16. Now remove the clips from intermediate plate (C) and dia-
phragm head (D), and tighten the screws (E) uniformly and di-
agonally (hand-tight).
17. Turn the fan to check that the pump rotates freely.
18. For two-headed pumps: Carry out steps 3. to 9.of disassem-
bling as well as 1.-17.of assembling for the second pump head.
19. For two-headed pumps: Remount the pneumatic connection(s)
between the pump heads.
20. Remount fan cover. For one-headed pumps: Fig. 1/
7
, p.
11; for
two-headed pumps: Fig. 2/
7
7
21. Check and ensure the gas-tightness of the pump head/pump
heads and the tubing:
WARNING
Before putting the pump into operation again,
check and ensure the gas-tightness of the pump
head and the tubing.
Summary of Contents for N 143 AN.12 E
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