VACUUBRAND MV 2 NT VARIO - Manual (Page 89)

page 89 of 106
➨
Position new diaphragm (F) between dia-
phragm clamping disc with square head
screw (E) and diaphragm support disc (G).
+
Note: This is a double diaphragm consist-
ing of two single diaphragms! Put the two
diaphragms together with the printed sides
outwards.
+
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 diaphragm carefully together
with diaphragm clamping disc and diaphragm support disc in the dia-
phragm key.
+
Avoid damage of the diaphragm: Do not excessively bend or crease
the diaphragm.
+
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!
E
G
F
+
Assemble the original number of washers
(H) between diaphragm support disc (G)
and connecting rod (I).
➨
Screw diaphragm clamping disc (E), dia-
phragm (F), diaphragm support disc (G),
and washers (H) to connecting rod (I).
➨
Optimum torque for the diaphragm support disc: 4.4 ft . lb
f
(6 Nm), it is
recommended to use a torque wrench. Attach torque wrench to dia-
phragm key (hexagonal bolt 6 mm wide).
Note: Never use the diaphragm key with any additional tools like tongs
or Allen keys without appropriate torque limitation.
E
F