Servicing
Diaphragm Vacuum Pumps N86.16
20
Translation of original Operating and Installation Instructions, english, KNF121260-121531 04/20
9.3. Replacing diaphragm and valve plates
Disconnect the motor from mains and ensure that it is voltage-
free.
Allow the pump and the motor to cool
Clean the pump and free the pump of hazardous materials.
Remove the hoses/pipes from the pneumatic pump inlet and
outlet.
Spare part*
Quantity
Valve plate
1
Wave diaphragm (assembly
consisting of two equivalent
parts)
1
O-ring
1
Tab. 10
according to spare parts list, Chapter 11.1
Tools/Material
Fork wrench or socket wrench 5.5 mm
Pin-wrench for two hole nuts, pin diameter 4 mm (available as
“wrench for retainer plate”, a KNF accessory, see Chapter 11.2)
Holding tool (see accessory, Chapter 11.2).
Heat-resistant thread adhesive (e.g. DELO ML 5327)
Felt-tip pen
Tab. 11
Always replace the diaphragm and valve plate together to
maintain the pump performance.
Change the diaphragm and valve plate in the following sequence:
a) Preparatory step
b) Removing pump head
c) Changing diaphragm
d) Changing valve plate and sealing ring
e) Refitting pump head
f) Final step
Requirements
Spare parts
Tools/material
Information on procedure
