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.: 999155 / 29/01/2009
page 23 of 36
➨
To check the valves use a hex key to remove four (ME
4(R) NT / MZ 2(D, S) NT) or eight (ME 8 NT / MD 4 NT /
MV 2 NT) socket-head screws from the pump head and
remove the housing cover with head cover, valves and O-
rings (MD 4 NT / MV 2 NT / MZ 2S NT only).
☞
Never remove parts by using a spiky or sharp-edged tool
(e.g. screw driver), we recommend to use a rubber mallet
or compressed air (to be blown
carefully
into port).
➨
Remove the head cover carefully from the housing cover.
Note the position of the valves and remove them.
☞
Replace valves if necessary.
☞
Use petroleum ether or industrial solvent to remove de-
posits. Do not inhale.
Cleaning and inspecting the pump heads
ME 4 / MZ 2(D):
➨
Use an open-ended wrench w/f 17 to remove the screw-
in fitting and the connecting tube from the pump head. In
case, counterhold with open-ended wrench w/f 20.
➨
Position the pump on the side. Support pump appropriately if necessary. Open only one side of the
pump at a time.
ME 4R NT:
➨
Use open-end wrench (w/f 17) to remove the screw-in
fitting from the pump head (steady fitting with a second
open-end wrench w/f 20) and remove together with con-
necting hose.
ME 4R NT:
➨
Unscrew hollow bolt (stainless steel) at adjustment device
together with manometer using an open-end wrench w/f
17 (steady fitting with a second open-end wrench w/f 20).
➨
Dismount vacuum/pressure adjustment device together
with manometer.
