KNF N 820.3 FT.40.18, Operating Instructions Manual

Page: 22 / 36

Servicing Laboratory vacuum pumps N 8__.3 FT.40.18
22 Translation of original Operating Instructions, English, KNF 121350-121429 11/18
8.3. Changing Diaphragm and Valve
Plates/Sealings
8.3.1. N 820.3 FT.40.18, N 840.3 FT.40.18, N 842.3 FT.40.18

Pump is switched off and mains plug is removed from the
socket

Pump is clean and free of hazardous materials

Tubes removed from pump’s pneumatic inlet and outlet
Qty Material
1
Service Set (see Chapter 10)
1 Phillips-head screwdriver No. 2
1 Felt-tip pen
Tab. 11

Always replace diaphragm and valve plates/sealings together
to maintain the pump performance.
With multi-head pumps, parts of the individual pump heads can be
confused.

Replace the diaphragm and valve plates/sealings of the indi-
vidual pump heads consecutively.
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.

Wear protective clothing if necessary, e.g.
protective gloves.

Flush pump before replacing the diaphragm and
valve plates/sealings (see chapter 8.2.1).
Conditions
Tools and material
Information on procedure