KNF LABOPORT N820.18 EX Operating Instructions Manual page 102

Servicing
1 Screw
2 Pressure
plate
3 Head cover
4 Valve plates/
seals
5 Locating pin
6 Intermediate
plate
7 Diaphragm
8 Shim rings
42
Chemically-resistant Laboratory pump N820.18 EX / N840.18
4. Loosen the external cap screws (4/Fig. 8).
The two internal cap screws (1/Fig. 9) remain tightened
for the time being.
Removing pump head
1
2
3
4
5
6
7
8
Fig.9: Pump head (pump N820 shown)
The following item numbers refer to Fig. 9 unless speci-
fied otherwise.
1. Mark the pressure plate (2), head cover (3) and intermedi-
ate plate (6) with a continuous pencil stroke. This prevents
the parts from being incorrectly mounted later on.
2. Loosen the external screws (4/Fig. 8) of the pump heads.
Translation of Original Operating Instruction, KNF 317428-317425 05/21
EX