Replacing diaphragms and valves, Notice – VACUUBRAND PC 620 NT User Manual
Page 49
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.: 999188 / 19/05/2009
Tools required (metric):
- diaphragm key w/f 66
- open ended wrench w/f 17
- hex key size 5
- Phillips screw driver size 2
- flat-bladed screw driver 2.5 mm
- Torx screw driver TX20
- flat pliers
Set of seals for MZ 2C NT for PC 5xx NT ..................................................................................696869
Set of seals for MD 4C NT for PC 6xx NT .................................................................................696870
Diaphragm key (w/f 66) ...............................................................................................................636554
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, 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 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 tech-
nicians.
☞
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 capaci-
tors to discharge. Avoid the release of pollutants. Allow sufficient cooling of the
pump. Before starting maintenance. 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
starting maintenance.
Partially the pictures show pumps in other versions. This doesn´t influence replacing diaphragms and
valves of the pump.
NOTICE