VACUUBRAND MZ 2C VARIO - Manual (Page 45)

page 45 of 51
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. manual-no.: 999034 / 22/04/2008
Montage of the connecting hose
Individual performance check of a pump head
By measuring the pressure at the inlet port of the individual
head:
Use a suitable vacuum gauge (e. g. DVR 2, cat. no.: 682902),
make sure that it is correctly calibrated, and measure the pres-
sure at the inlet port. A vacuum of less than 120 mbar should
be indicated.
☞ If the reading is higher, recheck the pump chamber and make
sure that the valves and the diaphragms are correctly seated
(diaphragms concentric with bore).
➨ Use open ended wrench (w/f 14) to reconnect hose to elbow
fitting.
➨ Tighten union nuts first by hand and then tighten one full
turn using open ended wrench (w/f 17).
➨ Screw in four socket head screws fixing housing cover cross-
wise (e. g. in the sequence
➀, ➁, ➂, ➃) first slightly, then
tighten.
☞ Do not tighten until head cover is in contact with housing,
torque 12 Nm.
Reassemble in reverse order.
➨ Install head cover (with O-ring if applicable), valves and hous-
ing cover.
☞ Make sure that the valves are correctly seated: Valves at
the outlet with round centred opening under valve, valves at
the inlet with kidney-shaped opening beside valve.
➨ By turning eccentric bushing, bring connecting rod into up-
per turning point position (Max. stroke of the rod).
☞ Pay attention that the diaphragm stays positioned centrally
so that it will become clamped uniformly between housing
and head cover.
➂
➃
➀
➁