Edwards XDD1 115 V AC, Instruction Manual

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A746‐03‐885A ‐ Maintenance
Figure 20 Position a new diaphragm
7. Lift diaphragm at the side and position carefully together with diaphragm clamping
disc and diaphragm support disc in the diaphragm key.
8. Smaller number of washers: The pump will not attain final vacuum. More washers:
Clamping disc will hit head cover; noise or even blockage of the pump.
Figure 21 Diaphragm clamping disc
Assembling pump heads
1. Make sure that the square head screw of the diaphragm clamping disc is correctly
seated in the guide hole of the diaphragm support disc.
2. Assemble diaphragm clamping disc, diaphragm and diaphragm support disc to
connecting rod.
3. Position washers if available between diaphragm support disc and rod.
CAUTION:
Avoid damage of the diaphragm: Do not crack diaphragm in a way that light lines at the
diaphragm upper side occur.
WARNING:
Do not turn or change housing covers!