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 22 of 36
Replacing diaphragms and valves
All bearings are encapsulated and are filled with long-life lubricant. Under normal
operating 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 capacitors have to be replaced by an electrician. Depending on in-
dividual 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.
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 de
-
fective 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 mainte-
nance technician is familiar with the safety procedures which relate to the prod-
ucts processed 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 sys-
tem.
☞
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 (MZ 2D NT)
- Open-ended wrench w/f 17 / 20 (ME 4(R) NT, MZ 2(D, S)
NT)
- Hex key size 5
- Diaphragm key w/f 66
Set of seals
for
ME 4 NT, MZ 2 NT
..............................................................................................
696860
Set of seals
for
MD 4 NT, MV 2 NT
.............................................................................................
696861
Set of seals
for
ME 8 NT
............................................................................................................
696862
Set of seals
for
MZ 2D NT
...........................................................................................................
696863
Set of seals
for
MZ 2S , ME 8S NT
(2x)
.....................................................................................
696868
Set of seals
for
ME 4R NT
.........................................................................................................
696859
Diaphragm key
(w/f 66) ...............................................................................................................
636554
NOTICE
NOTICE
