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Note
The changing of diaphragm(s), valve plates and sealing rings is to be carried out in the following order:
1.
Remove pump head
2.
Change the diaphragm
3.
Change valve plates and sealing rings
4.
Mount pump head
Proceed as follows:
19.2.1 REMOVE PUMP HEAD TYPE N 3/5/9 KPE
1.
Mark head cover 3 (with metal frame with N3/5), intermediate plate 2 and housing 1 with a felt pen
(M). This rules out parts being mounted incorrectly during subsequent assembly.
2.
Loosen the four head cap screws 4 and remove the head cover from the pump housing together
with the intermediate plate.
19.2.2 REPLACING THE DIAPHRAGM TYPE N 3/5/9 KPE
1.
Move the structured diaphragm 9 by turning the fan wheel into the top dead centre position.
2.
Lift the structured diaphragm on the opposite side edges, grip and unscrew counter clockwise. Make
sure that the adjusting washer(s) 11 do not fall from the threaded bolt of the structure diaphragm into
the housing.
3.
Remove adjusting washer(s) 11 from the threaded bolt of the structure diaphragm and keep.
4.
Inspect all parts for contamination and clean if necessary.
5.
Place the adjusting washer(s) onto the threaded bolts of the new structure diaphragm.
6.
Move the connecting rod 13 into the top dead centre position.
7.
Screw the new structure diaphragm with washer(s) onto the connecting rod (clockwise) and hand-
tighten.
19.2.3 VALVE PLATE CHANGE TYPE N 3/5/9 KPE
1
Separate head cover 3 (with metal frame with N3/5) from the intermediate plate 2.
2
Remove the valve plate 7 and the sealing rings 8 from the intermediate plate.
3
Check valve seat, intermediate plate and head cover for cleanliness; in the event of unevennesses,
scratches and corrosion, these parts are to be replaced.
4
Insert the new valve plate 7 into the valve seat of intermediate plate 2; the valve plates for pressure
and suction sides are identical; the same applies to upper and lower sides of the valve plates.
5
By slight horizontal movement of the valve plates, ensure that these are not strained.
6
Insert sealing rings into the intermediate plate.
38
Valve plates, diaphragms and seals should always be replaced at the same time.
CSS-VC-1.6 | 1.02.01
www.mc-techgroup.com
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