Waters Xevo TQ MS, Operator And Maintenance Manual, Page: 72 / 184

4-24 Maintenance Procedures
4. Ensure that the O-ring on the oil filler plug is clean and properly seated.
5. Fit and tighten the oil filler plug.
6. Start the mass spectrometer (see “Starting the mass spectrometer” on
page 2-2 ).
Tip:
After you add oil to the pump, the following situations can occur:
• The oil level drops slightly during the first month of operation.
• The oil changes color (darkens) over time.
• After running the pump for 12 to 48 hours, a few drops of oil
sometimes appear near the filler plug. Excess oil around the lip of
the filler plug flows downwards and drips from the pump when it
reaches operating temperature.
• When the pump approaches operating temperature, any oil spilled
becomes odorous.
Caution:
To avoid oil leakage when fitting the oil filler plug to
the roughing pump,
• ensure that the plug is not cross threaded.
• ensure that the O-ring is not pinched.
• do not over tighten the plug.