VACUUBRAND MZ 2C +AK+EK - Manual (Page 23)

page 23 of 28
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.: 995653 / 06/10/2009
➨ 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.
Individual performance check of a pump head :
Assembling pump heads:
➨ By turning eccentric bushing (front of connecting rod), bring
connecting rod into a position in which diaphragm is in con-
tact with housing and centred with respect to bore.
Reassemble in reverse order.
➨ Install head cover, valves and housing cover with housing
cover insert.
☞ 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.
By measuring the pressure at the inlet port of the individual
head:
Use a suitable vacuum gauge (e. g. DVR 2, cat. no.: 68 29 02),
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).
➃ ➃ ➃ ➃ ➃
➀ ➀ ➀ ➀ ➀ ➁ ➁ ➁ ➁ ➁
➂ ➂ ➂ ➂ ➂