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.: 999021 / 07/05/2008
page 15 of 22
Set of seals
(diaphragms and valves) for
ME 8 / MZ 4 / MD 4
......................................................
696812
Set of seals
(diaphragms, valves and O-rings) for
MV 2
...............................................................
696834
O-rings
for
MD 4
....................................................................................................................
8 x 637090
Face wrench
with torque indicator ................................................................................................
637580
Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal oper-
ating conditions, the pump is maintenance free. The valves and the diaphragms as well
as the motor capacitors are wear parts. If the rated ultimate vacuum is no longer
achieved or in case of increased noise level, the pump interior, the diaphragms and the
valves must be cleaned and the diaphragms and valves must be checked for cracks or
other damage.
Depending on individual cases it may be efficient to check and clean the pump heads
on a regular basis. In case of normal wear the lifetime of the diaphragms and valves is
> 10000 operating hours.
☞
Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amount.
If the pump is exposed to corrosive gases or vapour or in case of deposits, mainte-
nance should be carried out frequently.
☞
Regular maintenance will improve the lifetime of the pump and also protect both
man and environment.
Before starting maintenance
vent the system, isolate the pump and other compo-
nents from the vacuum system and the electrical supply. Avoid the release of pollut-
ants. Allow sufficient cooling of the pump. Before starting maintenance, wait
two min-
utes
after isolating the equipment from mains to allow the capacitors to discharge.
Ensure that the pump cannot be operated accidentally. Never operate the pump if
covers or other parts of the pump are disassembled. Never operate a defective or
damaged pump.
Ensure that the maintenance technician is familiar with the safety procedures which
relate to the products processed by the pumping system.
The pump might be contaminated with the process chemicals that have been pumped
during operation. Ensure that the pump is decontaminated before maintenance and
take adequate precautions to protect people from the effects of dangerous substances
if contamination has occurred.
☞
Wear appropriate safety-clothing when you come in contact with contaminated com-
ponents.
☞
☞
☞
☞
☞
Please read section ”Replacing diaphragms and valves” completely before star-
ting maintenance.
Partially the pictures show pumps in other versions. This doesn´t influence replacing diaphragms and
valves of the pump.
Tools required (metric):
-
Phillips screw driver size 2
-
Open-ended wrench w/f 17
-
Hex key size 5
-
Face wrench with torque indicator
