Servicing
N 810/820/840.18 EX
28
Translation of original Operating Instructions, English, KNF 309515-309518 06/17
Removing pump head
1. For two-headed pumps: On the pneumatic head connection
(
3
), loosen the union nuts (
2
) by hand. Then slightly loosen the
angle-fitting (
1
) in the pump head (
4
) by turning it anticlock-
wise, so that the connecting tube can be pulled out.
2. Mark the position of top plate (Fig. 9/
5
), head plate (Fig. 9/
6
),
intermediate plate (Fig. 9/
8
) and adapter relatively to each oth-
er by a drawing line (for two-headed pumps: at both pump
heads) with a felt-tip pen (
1
). This helps to avoid incorrect as-
sembly later.
3. Loosen the outer screws (
5
) on the pump head/pump heads.
4. Carefully remove pump head / pump heads.
Change diaphragm
Replace the diaphragms of two-headed pumps consecutively
in order to ensure that the same number of diaphragm spacers
is used as before.
1. For two-headed pumps: Push down one diaphragm until other
diaphragm is pushed upwards to its highest position.
2. Carefully unscrew the upper diaphragm (
1
) anti-clockwise
using both hands.
3. Replace spacer thick (
2
) and spacers thin (
3
) onto the screw
thread of the new diaphragm (same number and order).
4. Screw in the new diaphragm and tighten it by hand.
5. With a two-headed pump: Complete steps 1 through 4 for the
second pump head.
Fig. 6: Removing pump head
Fig. 7: Changing structured
diaphragm
