Rotary pump maintenance 10-7
Changing the rotary pump oil
Change the rotary pump oil every 3 to 4 months, or earlier, if it becomes
noticeably discolored.
Required materials
• Chemical-resistant, powder-free gloves.
• Flat-blade screwdriver.
• Container to catch used oil.
• Funnel.
• Vacuum pump oil [use only Ultragrade19 or Inland Q45 (Edwards 45)
vacuum pump oil].
To drain the rotary pump oil:
Tip: Operate the pump to warm the oil before draining it.
1. Gas-ballast the rotary pump.
See also: Gas-ballasting the rotary pump on page 10-5.
2. Vent and shut down the instrument.
See also: Starting-up and Shutting-down the Instrument on page A-1.
3. Switch off the power supply to the pump.
Warning: To avoid burn injuries, be careful while working
with the rotary pump; it can be hot.
Warning: The rotary pump oil can to be contaminated with
toxic and biohazardous materials. Wear chemical-resistant,
powder-free gloves at all times while handling the oil, and
ensure that the waste oil is disposed of according to local
environmental regulations.
Caution: The ballast valve must be closed before venting the
instrument.
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