Hoefer VP200 - Manual (Page 20)

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p12
Important! Do not use a pointed
or sharp edged tool such as a
screwdriver to pry off the cover.
It could damage internal parts.
Servicing diaphragms and valves
If your pump no longer achieves the rated
vacuum, possible causes include an accumulation
of condensates inside the pump head or damage
to sealing parts. Each of the three sections of the
pump head must be disassembled, cleaned, and
inspected for damage. Two diaphragms and four
valves are the only customer serviceable parts in
the pump head.
Service only one side of the pump at a time to
avoid mixing of parts.
Disassembly:
1
Turn the mains power off and allow the system to
reach atmospheric pressure (adjust the gas ballast
valve for quick pressure bleed-off). Disconnect the
pump from any device for which it was drawing a
vacuum and unplug the power cord.
2
The following (metric) tools are required:
• Torx driver T20
• 5 mm wide Allen key
• 2.5 mm wide slotted screwdriver
• Flat pliers
• Diaphragm key width 66 mm
Note: Under normal wear,
diaphragms and valves should
perform satisfactorily for a
minimum of 10,000 operating
hours. If your pump is put to
heavy use, or if internal parts
are regularly exposed to corro-
sive gases or vapors, a regular
maintenance program is recom-
mended to prolong the life of
the pump.
Note: If the pump head is
potentially contaminated with
condensates of process chemi-
cals, take proper precautions to
protect yourself from chemical
exposure, and decontaminate
the pump as required.