VACUUBRAND MV 2 NT VARIO - Manual (Page 88)

page 88 of 106
Replacing the diaphragm
+
Underneath the pump there is a connecting tube (K) between the two
housing covers. The connecting tube is merely stuck into the housing
covers and sealed with seal rings at the connecting tube’s ends. If the
housing cover is removed, the connecting tube becomes detached as
well.
➨
Disassemble the housing cover (A) to check
the valves (C).
➨
Unscrew eight Allen screws with a 5mm
wide Allen key. Remove the housing cover
(A) together with head cover (D), valves (C)
and O-rings (B).
+
Never use a pointed or sharp-edged tool to remove parts (e.g., screw-
driver). We recommend to use a rubber mallet or compressed air (to
be blown carefully into port).
➨
Remove the head cover (D) carefully from the housing cover (A). Note
position and alignment of valves (C). Remove the valves.
+
Replace valves or O-rings if necessary.
+
Use petroleum ether or other industrial solvent to remove deposits. Do
not inhale vapors.
+
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.
E
F