KNF N85.3 - Page 32

Servicing Diaphragm pump N85, N86
32 Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
9.3.2. N86K_E, N86K_DC and N86K_DC-B
 Pump disconnected from mains and de-energized.
 Pump is clean and free of hazardous materials.
 Hoses removed from pump’s pneumatic inlet and outlet.
Spare part/tool
Quantity
Service Set*
1
Phillips screwdriver no. 1
1
Felt-tip pen
1
Tab. 18 *according to Chapter 11
Diaphragm and valve plates/sealings are the only parts of the
pump subject to wear. They are simple to change.
Always change valve plates/sealings and diaphragm on both
heads at the same time. If the diaphragm and the valve
plates/sealings are not changed at the same time the nominal per-
formance of the pump is not guaranteed after the servicing.
WARNING
Dangerous substances in the pump can
c
ause a health hazard.
D
epending on the substance transferred, caustic
b
urns or poisoning are possible.

Wear protective clothing if necessary, e.g. pro-
tective gloves.

Flush the pump before replacing the diaphragm
and valve plates/sealings (see Chapter
9.2.1).
CAUTION
Danger of burns from hot pump parts
T
he pump head or motor may be hot even after the
p
ump has been shut off.

Allow the pump to cool off after operation.
Change the diaphragms and valve plates/sealings in the following
sequence:
a.) Preparatory steps
b.) Remove pump head
c.) Change diaphragm
d.) Change valve plates/sealings
e.) Refit pump head
f.) Final steps
Requirement
Spare parts/tools
Information on procedure