VACUUBRAND MZ 4C - Manual (Page 18)

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.: 997999 / 24/04/2008
page 18 of 28
Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal opera-
ting conditions, the pump is maintenance free. The valves and 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. Check every capacitor regularly by measuring its capacity and estimating its
operation time. Exchange old capacitors early enough to prevent a failure. The capaci-
tors have to be replaced by an electrician. 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 media or in case of deposits, maintenance should
be carried out frequently.
☞ Regular maintenance will improve the lifetime of the pump and also protect both
man and environment.
Ensure that maintenance is done only by suitable trained and supervised technicians.
☞ 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.
☞ Before starting maintenance isolate the pump from the electrical supply and wait
two minutes after isolating the equipment from mains to allow the capacitors to
discharge. Avoid the release of pollutants. Allow sufficient cooling of the pump.
☞ Attention: 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. Ensure that the maintenance
technician is familiar with the safety procedures which relate to the products proc-
essed by the pumping system.
☞ Wear appropriate safety-clothing when you come into contact with contaminated
components. Avoid the release of pollutants.
Before starting maintenance vent the pump and isolate it from the vacuum system.
Set of seals (diaphragms, valves) for ME 8C ......................................................................... 4 x 696813
Set of seals (diaphragms, valves) for MZ 4C / MD 4C .................................................................. 696815
Face wrench with torque indicator ................................................................................................ 637580
☞ ☞ ☞ ☞ ☞ 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.
Tools required (metric):
- Phillips screw driver size 2
- Open-ended wrench w/f 10/14/17
- Hex key size 5
- Face wrench with torque indicator