VACUUBRAND MV 2 NT VARIO - Manual (Page 94)

page 94 of 106
Replacing the diaphragm
➨
Remove the punched part in the centre of the new diaphragm when
replacing a diaphragm with square hole (see below).
+
+
Check diaphragm (F) for damage and re-
place if necessary.
➨
Lift diaphragm carefully sidewise.
+
Never use a pointed or sharp-edged tool to
lift the diaphragm.
➨
Use the diaphragm key to grip the diaphragm
support disc (G) below the diaphragm.
➨
Unscrew diaphragm support disc (G) with diaphragm (F) and dia-
phragm clamping disc (E).
➨
Check for washers (H) between the diaphragm support disc (G) and
the connecting rod (I). Do not mix the washers from the different pump
heads, since these are set at the factory to ensure proper pump per-
formance. Make sure that the original number is reassembled at the
individual pump head.
+
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 causing the pump to seize up.
+
If the old diaphragm is difficult to separate from the diaphragm support
disc, immerse assembly in naphtha or petroleum ether. Do not inhale
vapors!