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.: 999084 / 05/10/2009
page 35 of 46
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.
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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.
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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. Drain condensate if applica-
ble, avoid the release of pollutants. Separate pump from cooling water circuit. Allow
sufficient cooling of the pump.
Wait two minutes
after isolating the equipment from
mains to allow the capacitors to discharge.
Ensure that the pump cannot be oper-
ated 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.
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Wear appropriate safety-clothing when you come in contact with contaminated com-
ponents.
Tools required (metric):
-
Phillips screw driver size 2
-
Open-ended wrench w/f 10/14/17
-
Hex key size 5/7
-
Face wrench with torque indicator
Set of seals
(2 diaphragms and 4 valves) for MZ 2C
(PC 500)
............ ........................................
696814
Set of seals
(4 diaphragms and 8 valves) for MD 4C
(PC 600)
............ .......................................
696815
Face wrench
with torque indicator ...............................................................................................
637580
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Please read section ”Replacing diaphragms and valves” completely before start-
ing maintenance.
Partially the pictures show pumps in other versions. This doesn´t influence replacing diaphragms and
valves of the pump.
