KNF LABOPORT N820.18 Originalbetriebsanleitung Seite 114

Servicing
50
Fitting the pump head
1. Move the diaphragms (7) to the center position.
2. Press on the entire perimeter of the diaphragm (7). Only
press on the diaphragm (7) on one pump head.
3. Place the intermediate plate (6) with valve plates/seals (4)
on the mount according to the pencil line.
4. Place the head plate (3) on the intermediate plate (6) in
line with the locating pin (5).
5. Place the pressure plate (2) on the head plate according
to the pencil line.
6. Tighten the screws, working in a crosswise pattern (tight-
ening torque: N820: 4 Nm; N840: 5 Nm).
7. Tighten the screw (1) in the center of the pressure plate
(tightening torque: 1 Nm).
8. Perform steps 1 – 7 for the second pump head.
9. Place the pump heads (consisting of head plate (3), inter-
mediate plate (6) with valve plates/seals (4) and pressure
plate (2)) together with the connection tube on the pump
housing according to the pencil line.
10. Mount the handle cover (3/Fig. 8).
11. Tighten the screws (2/Fig. 8) of the handle cover (3/Fig. 8)
(tightening torque: 2 Nm).
Translation of Original Operating Instruction, KNF 317428-317425 02/23
Chemically-resistant Laboratory pump N820.18 / N840.18