VACUUBRAND ME 4R - Manual (Page 16)

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.: 999122 / 02/09/2009
page 16 of 21
➂ ➂ ➂ ➂ ➂
➃ ➃ ➃ ➃ ➃
➀ ➀ ➀ ➀ ➀
➁ ➁ ➁ ➁ ➁
Assembling of fittings and adjustment devices:
Assembling pump heads:
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.: 68 29 02),
make sure that it is correctly calibrated, and measure the pres-
sure at the inlet port. A vacuum of less than 110 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).
☞ When assembling the adjustment device firstly screw on
valve block with hollow bolt.
☞ Align valve block before tightening the hollow bolt.
➨ Tighten hollow bolt with open-end wrench w/f 7. Steady fit-
ting with a second open-end wrench (w/f 20).
➨ 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.
➨ 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.