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Servicing
82
3. Carefully remove the pump heads to the side (see Fig.
27).
The pneumatic connections remain mounted in the pump
heads.
Fig.27: Remove pump heads
Replacing the diaphragm
On the pump, the diaphragms (7) are changed succes-
sively to ensure that the shim rings (8) are used in the
same quantity as previously.
1. Press down one diaphragm (7) so that the other di-
aphragm is in the upper change point.
2. Carefully turn the upper diaphragm (7) counterclockwise
by hand and remove it.
Translation of Originial Operating Instruction, KNF 339416-339418 02/23
Vacuum system SC820G / SC840G
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