page 62 of 76
+ If the old diaphragm is difcult to separate
from the diaphragm support disc, immerse
assembly in naphtha or petroleum ether. Do
not inhale vapors!
+ Check for washers between the diaphragm
support disc and the connecting rod. Make
sure that the original number is reassembled.
➨ Position new diaphragm between diaphragm
clamping disc with square head screw and
diaphragm support disc.
+ Note: Position diaphragm with pale side
towards diaphragm clamping disc (facing
pump chamber).
+ Make sure that the square head screw of the
diaphragm clamping disc is correctly seated
in the guide hole of the diaphragm support
disc.
➨ Lift the diaphragm at the side. Place the di-
aphragm carefully together with diaphragm
clamping disc and diaphragm support disc in
the diaphragm key.
+ Avoid damage of the diaphragm: Do not ex-
cessively bend or crease the diaphragm.
➨ Assemble the original number of washers
between diaphragm support disc and con-
necting rod.
+ Too few washers: The pump will not attain
vacuum specication. Too many washers:
Diaphragm clamping disc will hit head cover,
causing noisy operation and possibly caus-
ing the pump to seize up.
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