Servicing
Diaphragm pump N820.18 CN / N840.18 CN
32
Translation of Original Operating Instruction, KNF 317428-338560 06/22
10.3 Replace diaphragm, valve plates/seals and
O-rings
Requirements
Necessary requirements
Pump
- Pump switched off and power cable pulled
out of socket
- Pump cleaned and free of hazardous mate-
rials
- Hoses removed from pneumatic inlet and
outlet
Tab.14:
Material and
tools
Quan-
tity
Material
1
TORX® screwdriver T20
1
TORX® T25 screwdriver (only for N840.3FT.29.18G)
1
Spare parts set (see Chapter Spare parts)
1
Pencil
Tab.15:
Information on
the procedure
à
Always replace diaphragms, valve plates/seals, and O-
rings together to maintain the performance of the pump.
à
Replace the diaphragms and valve plates/seals of the in-
dividual pump heads one after the other.
