VACUUBRAND BVC professional G - Manual (Page 57)

page 57 of 68
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If the old diaphragm is difficult to separate
from the diaphragm support disc, immerse
assembly in naphtha or petroleum ether. Do
not inhale vapors!
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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.
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Note: Position diaphragm with pale side
towards diaphragm clamping disc (facing
pump chamber).
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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.
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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.
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Too few washers: The pump will not attain
vacuum specification. Too many washers:
Diaphragm clamping disc will hit head cover,
causing noisy operation and possibly caus-
ing the pump to seize up.